Cordy, J.
In these consolidated cases, we must decide whether the Housing Appeals Committee (committee) of the Department of Housing and Community Development (department) has the authority to alter the conditions placed on the approval of a comprehensive permit, where the developer has failed to demonstrate that those conditions make the housing project uneconomic. We conclude that the plain language of the comprehensive permit act, G. L. c. 40B, §§ 20-23 (act), precludes such authority.4
1. Background, a. The Massachusetts comprehensive permit act. The material facts are not in dispute. In order to place them in context, we describe briefly the relevant portions of the act, inserted by St. 1969, c. 774, “which [have] been thoroughly canvassed in earlier opinions.” Middleborough v. Housing Appeals Comm., 449 Mass. 514, 516 (2007), citing Dennis Hous. Corp. v. Zoning Bd. of Appeals of Dennis, 439 Mass. 71, 76-78 (2003), and Board of Appeals of Hanover v. Housing Appeals Comm., 363 Mass. 339, 347-354 (1973). The primary purpose of the act is “to provide relief from exclusionary zoning practices which prevent[] the construction of badly needed low and [583]*583moderate income housing.” Taylor v. Housing Appeals Comm.., ante 149, 151 (2008), quoting Board of Appeals of Hanover v. Housing Appeals Comm., supra at 354. The act allows a “limited dividend organization interested in constructing low or moderate income housing to circumvent the often arduous process of applying to multiple local boards for individual permits and, instead, to apply to the local board of appeals for issuance of a single comprehensive permit.” Middleborough v. Housing Appeals Comm., supra at 516. See G. L. c. 40B, § 21. “In addition to streamlining the permitting process itself, the clear intent of the Legislature was to promote affordable housing by minimizing lengthy and expensive delays occasioned by court battles commenced by those seeking to exclude affordable housing from their own neighborhoods.” Standerwick v. Zoning Bd. of Appeals of Andover, 447 Mass. 20, 29 (2006).
Consistent with these “oft-repeated objectives,” id. at 30, the act establishes a straightforward appeals process for the applicant. G. L. c. 40B, §§ 22-23. “Whenever an application ... is denied, or is granted with such conditions and requirements as to make the building or operation of such housing uneconomic, the applicant shall have the right to appeal to the housing appeals committee . . . .” G. L. c. 40B, § 22.5 When a denial is reviewed by the committee, the local board of appeals has “the burden of proving, first, that there is a valid . . . local concern which supports such denial, and then, that such concern outweighs the regional housing need.” 760 Code Mass. Regs. § 31.06(6) (2001).6 That burden is consistent with the statutory language: “If the committee finds, in the case of a denial, that [584]*584the decision of the board of appeals was unreasonable and not consistent with local needs, it shall vacate such decision and shall direct the board to issue a comprehensive permit or approval to the applicant.” G. L. c. 40B, § 23. By contrast, when the developer appeals from an approval with conditions, “the applicant shall have the burden of proving that the conditions make the building or operation of the housing uneconomic.” 760 Code Mass. Regs. § 31.06(3). If the applicant presents evidence sufficient to meet this burden, “the Board shall [then] have the burden of proving, first, that there is a valid . . . local concern which supports such conditions, and then, that such concern outweighs the regional housing need.” Id. at § 31.06(7). The shifting burdens are likewise consistent with the statutory language. Section 22 of the act allows for review of an approval only when it “is granted with such conditions and requirements as to make the building or operation of such housing uneconomic.” G. L. c. 40B, § 22. Section 23 empowers the committee to “order [the] board to modify or remove any such condition or requirement” only when the board’s approval with conditions “makes the building or operation of such housing uneconomic and is not consistent with local needs” (emphasis added). G. L. c. 40B, § 23.
The structure of the act “reflects the Legislature’s careful balance between leaving to local authorities their well-recognized autonomy generally to establish local zoning requirements . . . while foreclosing municipalities from obstructing the building of a minimum level of housing affordable to persons of low income” (citation omitted). Zoning Bd. of Appeals of Wellesley v. Ardemore Apartments Ltd. Partnership, 436 Mass. 811, 822-823 (2002).
b. Facts and procedural history. Against this backdrop, we consider the undisputed facts. The developer, Archstone-Smith Operative Trust, is a Maryland limited dividend corporation, eligible to seek a comprehensive permit under G. L. c. 40B, [585]*585§ 21. On September 28, 2000, the developer applied to the board of appeals of Woburn (board) for a comprehensive permit to build 640 units of housing, of which twenty-five per cent would be affordable, on a 74.46 acre parcel of land owned by Northeastern University on Cambridge Road in Woburn.7
The proposed project was to consist of thirty-two twenty-unit buildings, and a 5,500 square foot recreation center. The proposal envisioned two types of residential buildings: twenty-two two-story garden apartment buildings with twelve one-bedroom units and eight two-bedroom units per building; and ten three-story split garden apartments that would include ten one-bedroom units and ten two-bedroom units per building. The proposed total “impervious” areas of the development (including the apartment building footprints, community center building, drives and parking, but excluding walkways) comprised 28.4 per cent of the site, or 21.2 acres. Proposed open space area constituted 71.6 per cent of the development, or 53.3 acres, including preserved natural wetland areas, preserved natural upland areas, and landscaped areas.
The board held nine days of public hearings on the developer’s proposal, beginning on October 18, 2000, and concluding on July 25, 2001. On August 22, 2001, the board voted to grant a comprehensive permit with conditions, and issued its written decision on September 10, 2001, delineating each condition. The comprehensive permit set forth fifty conditions in total, most significantly limiting the development to 300 units instead of the 640 units proposed.8
On September 11, 2001, the developer appealed from the [586]*586board’s decision to the committee. The committee specially designated a hearing officer to hear evidence and recommend a decision for the committee’s review. The hearing officer conducted a site visit and held twenty-seven days of evidentiary hearings, during the course of which 170 exhibits were admitted in evidence.
On June 11, 2003, the committee issued its decision.9 Pursuant to §§ 22 and 23 of the act, and 760 Code Mass. Regs.
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Cordy, J.
In these consolidated cases, we must decide whether the Housing Appeals Committee (committee) of the Department of Housing and Community Development (department) has the authority to alter the conditions placed on the approval of a comprehensive permit, where the developer has failed to demonstrate that those conditions make the housing project uneconomic. We conclude that the plain language of the comprehensive permit act, G. L. c. 40B, §§ 20-23 (act), precludes such authority.4
1. Background, a. The Massachusetts comprehensive permit act. The material facts are not in dispute. In order to place them in context, we describe briefly the relevant portions of the act, inserted by St. 1969, c. 774, “which [have] been thoroughly canvassed in earlier opinions.” Middleborough v. Housing Appeals Comm., 449 Mass. 514, 516 (2007), citing Dennis Hous. Corp. v. Zoning Bd. of Appeals of Dennis, 439 Mass. 71, 76-78 (2003), and Board of Appeals of Hanover v. Housing Appeals Comm., 363 Mass. 339, 347-354 (1973). The primary purpose of the act is “to provide relief from exclusionary zoning practices which prevent[] the construction of badly needed low and [583]*583moderate income housing.” Taylor v. Housing Appeals Comm.., ante 149, 151 (2008), quoting Board of Appeals of Hanover v. Housing Appeals Comm., supra at 354. The act allows a “limited dividend organization interested in constructing low or moderate income housing to circumvent the often arduous process of applying to multiple local boards for individual permits and, instead, to apply to the local board of appeals for issuance of a single comprehensive permit.” Middleborough v. Housing Appeals Comm., supra at 516. See G. L. c. 40B, § 21. “In addition to streamlining the permitting process itself, the clear intent of the Legislature was to promote affordable housing by minimizing lengthy and expensive delays occasioned by court battles commenced by those seeking to exclude affordable housing from their own neighborhoods.” Standerwick v. Zoning Bd. of Appeals of Andover, 447 Mass. 20, 29 (2006).
Consistent with these “oft-repeated objectives,” id. at 30, the act establishes a straightforward appeals process for the applicant. G. L. c. 40B, §§ 22-23. “Whenever an application ... is denied, or is granted with such conditions and requirements as to make the building or operation of such housing uneconomic, the applicant shall have the right to appeal to the housing appeals committee . . . .” G. L. c. 40B, § 22.5 When a denial is reviewed by the committee, the local board of appeals has “the burden of proving, first, that there is a valid . . . local concern which supports such denial, and then, that such concern outweighs the regional housing need.” 760 Code Mass. Regs. § 31.06(6) (2001).6 That burden is consistent with the statutory language: “If the committee finds, in the case of a denial, that [584]*584the decision of the board of appeals was unreasonable and not consistent with local needs, it shall vacate such decision and shall direct the board to issue a comprehensive permit or approval to the applicant.” G. L. c. 40B, § 23. By contrast, when the developer appeals from an approval with conditions, “the applicant shall have the burden of proving that the conditions make the building or operation of the housing uneconomic.” 760 Code Mass. Regs. § 31.06(3). If the applicant presents evidence sufficient to meet this burden, “the Board shall [then] have the burden of proving, first, that there is a valid . . . local concern which supports such conditions, and then, that such concern outweighs the regional housing need.” Id. at § 31.06(7). The shifting burdens are likewise consistent with the statutory language. Section 22 of the act allows for review of an approval only when it “is granted with such conditions and requirements as to make the building or operation of such housing uneconomic.” G. L. c. 40B, § 22. Section 23 empowers the committee to “order [the] board to modify or remove any such condition or requirement” only when the board’s approval with conditions “makes the building or operation of such housing uneconomic and is not consistent with local needs” (emphasis added). G. L. c. 40B, § 23.
The structure of the act “reflects the Legislature’s careful balance between leaving to local authorities their well-recognized autonomy generally to establish local zoning requirements . . . while foreclosing municipalities from obstructing the building of a minimum level of housing affordable to persons of low income” (citation omitted). Zoning Bd. of Appeals of Wellesley v. Ardemore Apartments Ltd. Partnership, 436 Mass. 811, 822-823 (2002).
b. Facts and procedural history. Against this backdrop, we consider the undisputed facts. The developer, Archstone-Smith Operative Trust, is a Maryland limited dividend corporation, eligible to seek a comprehensive permit under G. L. c. 40B, [585]*585§ 21. On September 28, 2000, the developer applied to the board of appeals of Woburn (board) for a comprehensive permit to build 640 units of housing, of which twenty-five per cent would be affordable, on a 74.46 acre parcel of land owned by Northeastern University on Cambridge Road in Woburn.7
The proposed project was to consist of thirty-two twenty-unit buildings, and a 5,500 square foot recreation center. The proposal envisioned two types of residential buildings: twenty-two two-story garden apartment buildings with twelve one-bedroom units and eight two-bedroom units per building; and ten three-story split garden apartments that would include ten one-bedroom units and ten two-bedroom units per building. The proposed total “impervious” areas of the development (including the apartment building footprints, community center building, drives and parking, but excluding walkways) comprised 28.4 per cent of the site, or 21.2 acres. Proposed open space area constituted 71.6 per cent of the development, or 53.3 acres, including preserved natural wetland areas, preserved natural upland areas, and landscaped areas.
The board held nine days of public hearings on the developer’s proposal, beginning on October 18, 2000, and concluding on July 25, 2001. On August 22, 2001, the board voted to grant a comprehensive permit with conditions, and issued its written decision on September 10, 2001, delineating each condition. The comprehensive permit set forth fifty conditions in total, most significantly limiting the development to 300 units instead of the 640 units proposed.8
On September 11, 2001, the developer appealed from the [586]*586board’s decision to the committee. The committee specially designated a hearing officer to hear evidence and recommend a decision for the committee’s review. The hearing officer conducted a site visit and held twenty-seven days of evidentiary hearings, during the course of which 170 exhibits were admitted in evidence.
On June 11, 2003, the committee issued its decision.9 Pursuant to §§ 22 and 23 of the act, and 760 Code Mass. Regs. § 31.06(3) (2001), the committee first reviewed the conditions imposed by the board to determine whether they rendered the development uneconomic, and found that the developer had “not proven that the conditions make the building or operation of the housing uneconomic.” Despite reaching this conclusion, the committee opined that neither the act nor its prior decisions “preclude!] further analysis of the [b]card’s conditions in every case in which conditions have not been proven to be uneconomic,” and ruled that “when the board has not articulated a reasonable factual or legal justification for a condition, we will modify or eliminate it.” Using this standard, the committee inquired whether the board’s conditions were supported by legitimate local concerns that outweighed the regional need for low or moderate income housing, and concluded that several were not. The committee then removed or modified the offending conditions. Most prominently, the committee altered the board’s condition limiting the development to 300 units.
[587]*587In determining what the proper size of the development should be, the committee found “that ample evidence exists in the record to support the [b]card’s position that the 640-unit proposed development is too large [and] impos[es] significant burdens on the surrounding community.”10 It then noted that it is “rarely wise for us to sift through the evidence to attempt to identify an acceptable size ourselves,” but it proceeded to do exactly that. Ultimately, the committee determined that the purchase and sale agreement for the land, entered into by the developer and Northeastern University, reflected the “developer’s neutral evaluation of the carrying capacity of the site.”11 The agreement was based on development approval for the construction of 420 units, and the committee adopted that number as the “acceptable number of units for this proposal.”12
Both the board and the developer filed complaints for judicial review in the Superior Court. The cases were consolidated, and the parties filed cross motions for judgment on the pleadings. On April 25, 2005, a judge entered an order upholding the committee’s decision in part and reversing it in part. In his ruling, the judge found that while the committee expressly regarded the board’s issuance of a comprehensive permit to be an approval with conditions, the committee’s review was more consistent with the review given to a denial. However, the judge concluded that the committee’s review was appropriate, because the condition substantially reducing the number of units was the “functional equivalent of a denial,” rather than an approval with conditions.13 Consequently, the committee could consider whether the conditions themselves were “reasonable and consistent with local needs,” even though it found that those conditions did not [588]*588make the project uneconomic, a finding that the judge specifically determined was supported by the evidence.14
The judge then reviewed the committee’s decision to determine whether substantial evidence existed in the record to support the committee’s alteration of the size of the project. Stated otherwise, the judge reviewed the committee’s revisions to determine whether the record supported its conclusion that they were more consistent with the local need for affordable housing (when balanced against Woburn’s other local concerns) than the conditions originally set by the board. The judge determined that the committee’s “selection of 420 units as the appropriate number of units . . . was unsupported by sufficient evidence in the record,” and remanded the case to the committee to determine “an appropriate number of units given the need for affordable housing and local needs concerns.”15
On remand to the committee, the developer contended that a 540-unit development, rather than the 640-unit development it had originally proposed, was consistent with local needs, and submitted three affidavits in support of such a development. The affidavits set out two alternative design plans for the development.16 On July 21, 2005, the committee held a hearing, which it limited to the cross-examination of witnesses whose testimony had been prefiled.17 On September 20, 2005, the committee is[589]*589sued its decision, concluding that a 540-unit development would be consistent with local needs and ordering the board to issue a comprehensive permit for a 540-unit complex. The committee’s decision did not designate which of the two design plans the board should permit.
The board again appealed from the committee’s decision by filing a new complaint in the Superior Court, contending, in pertinent part, that the committee exceeded its statutory power in approving a 540-unit plan on remand, because the developer’s revised plan constituted a substantial change from the original proposal. See 760 Code Mass. Regs. § 31.03 (2001).18 The board argued that the committee should have remanded the new proposal for its consideration. The judge found otherwise, declining to hold that the “540-unit plans constituted a ‘substantial change’ ” as a matter of law. Additionally, the judge concluded that the committee’s decision that a 540-unit development was reasonable and consistent with local needs was supported by substantial evidence, and that, when issuing the comprehensive permit, the board would be entitled to choose between the two 540-unit plans proposed.
The board’s second complaint was consolidated with the other cases, and final judgment entered on December 28, 2006, affirming the committee’s September 20, 2005, decision that ordered the board to issue a comprehensive permit for a 540-unit development. The board filed its notice of appeal, and we granted the board’s and the developer’s respective applications for direct appellate review.
[590]*5902. Discussion. The board’s principal contention on appeal is that the committee exceeded it statutory authority when it revised the conditions imposed by the board, increasing the approved project size from 300 units to 540 units, after finding that the board’s conditions did not make the project uneconomic. We agree.19
In reviewing a committee decision, we give “due weight to the experience, technical competence, and specialized knowledge of the agency, as well as to the discretionary authority conferred upon it.” G. L. c. 30, § 14 (7). See Board of Appeals of Hanover v. Housing Appeals Comm., 363 Mass. 339, 376 (1973). Yet, judicial deference to agency decisions is not without limits. Taylor v. Housing Appeals Comm., ante 149, 154-155 (2008). See Leopoldstadt, Inc. v. Commissioner of the Div. of Health Care Fin. & Policy, 436 Mass. 80, 91 (2002), quoting Protective Life Ins. Co. v. Sullivan, 425 Mass. 615, 618 (1997) (principle “one of deference, not abdication”). Here, the committee brushed aside the language of the governing statute and the regulations of the department and, in so doing, exceeded its authority.
General Laws c. 40B, § 22, provides that whenever a developer’s comprehensive permit application “is denied, or is granted with such conditions and requirements as to make the building or operation of such housing uneconomic, the applicant shall have the right to appeal to the housing appeals committee.” In other words, the committee may review an approval with conditions only if those conditions render the project uneconomic. Consistent with this statutory requirement, the department’s regulations provide that the developer must demonstrate that the conditions are uneconomic before the committee considers whether they are “consistent with local needs,” G. L. c. 40B, § 23. 760 Code Mass. Regs. § 31.06(3) (2001). Demonstrating that the [591]*591conditions render a project uneconomic is, therefore, a necessary element of the developer’s prima facie case for relief. G. L. c. 40B, §§ 22, 23. 760 Code Mass. Regs. § 31.06(3) (2001). Cf. Middleborough v. Housing Appeals Comm., 449 Mass. 514, 520-521 (2007) (though department denominates “fundability” as “a ‘jurisdictional requirement’ [it] is more properly viewed as a substantive aspect of the successful applicant’s prima facie case for ... a comprehensive permit”). Absent such a showing, the board is not required either under the act or the department’s regulations to demonstrate that its conditions are consistent with local needs. Here, the committee determined that the developer failed to show that the conditions imposed by the board rendered “the building or operation of [the project] uneconomic,” and its inquiry should have ended there.
Instead, the committee evaluated whether each condition was “supported by a local concern that outweighs the regional need for low or moderate income housing,” see 760 Code Mass. Regs. § 31.06(7), essentially reviewing the board’s approval with conditions as though it were a denial.20 The committee now claims that this review was proper, because the board’s conditions were so onerous as to be a “functional” or “de facto” denial, and points to several of its former decisions to support its contention that it has an established method of determining when the imposition of conditions should properly be considered to be a denial. In particular, it relies on Settlers Landing Realty Trust vs. Barnstable Bd. of Appeals, Housing Appeals Committee, No. 01-08, at 3-4 (Sept. 22, 2003) (Settlers Landing), in which the committee stated that “an arbitrary reduction in the number of units may constitute the denial of a permit,” and that “when a developer challenges a board decision that significantly reduces the number of units in the development, the appropriate course is to review the decision to determine whether it manifests a reason[592]*592able basis for the reduction.”21,22 The committee argues that the Settlers Landing decision standard has the same effect as a properly promulgated regulation, and is therefore entitled to this court’s deference.
There is no question that the committee’s decisions, like [593]*593department regulations, are entitled to deferential review. “ ‘It is a recognized principle of administrative law that an agency may adopt policies through adjudication as well as through rulemaking,’ . . . and ‘the choice made between proceeding by general rule or by individual, ad hoc litigation is one that lies primarily in the informed discretion of the administrative agency.’ ” Hastings v. Commissioner of Correction, 424 Mass. 46, 49 (1997), quoting Arthurs v. Board of Registration in Med., 383 Mass. 299, 312-313 (1981). However, the committee’s assertions are otherwise unavailing.
When determining the validity of an agency’s decision, we first determine “whether the Legislature has spoken with certainty on the topic in question, and if we conclude that the statute is unambiguous, we give effect to the Legislature’s intent.” Goldberg v. Board of Health of Granby, 444 Mass. 627, 632-633 (2005), citing Smith v. Commissioner of Transitional Assistance, 431 Mass. 638, 646 (2000). “Second, if the Legislature has not addressed directly the pertinent issue, we determine whether the agency’s resolution of that issue may ‘be reconciled with the governing legislation.’ ” Goldberg v. Board of Health of Granby, supra at 633, quoting Nuclear Metals, Inc. v. Low-Level Radioactive Waste Mgt. Bd., 421 Mass. 196, 211 (1995). The second part of our analysis requires “substantial deference” to the expertise and statutory “ ‘interpretation of [the] agency charged with primary responsibility’ for administering a statute.” Goldberg v. Board of Health of Granby supra, citing Briggs v. Commonwealth, 429 Mass. 241, 253 (1999).
Although we have noted that the act’s text “is not without its ambiguities,” Board of Appeals of Hanover v. Housing Appeals Comm., 363 Mass. 339, 354 (1973), the standards to be applied by the committee in reviewing board decisions are clear from the express language of the act. The committee is empowered to “order [the] board to modify or remove ... [a] condition or requirement” only when the board’s decision “makes the building or operation of such housing uneconomic and is not consistent with local needs” (emphasis added). G. L. c. 40B, § 23. The committee’s authority to alter or set aside conditions imposed by a local board is, therefore, expressly delineated by the act, and it may not be expanded by recasting an approval with condi-[594]*594tians as a denial. The Settlers Landing decision affords the committee almost unbridled discretion to consider any condition limiting the size of a proposal as the functional equivalent of a denial and, accordingly, to subject the board’s decision to a more exacting review. See Settlers Landing, supra at 3 (“an arbitrary reduction in the number of units may constitute the denial of a permit”). Such exceptionally broad discretion is inconsistent with both the language of the act and the “Legislature’s careful balance between leaving to local authorities their well-recognized autonomy generally to establish local zoning requirements . . . while foreclosing municipalities from obstructing the building of a minimum level of housing affordable to persons of low income.” Zoning Bd. of Appeals of Wellesley v. Ardemore Apartments Ltd. Partnership, 436 Mass. 811, 822 (2002).
Additionally, the express language of the act already contemplates a “functional” or “de facto” denial, that is, an approval with conditions that make the project uneconomic.23 If a developer can demonstrate that a comprehensive permit was “granted with such conditions and requirements as to make the building or operation of such housing uneconomic,” G. L. c. 40B, § 22, the conditions are then reviewed to determine if they are “consistent with local needs,” G. L. c. 40B, § 23, that is, conditions that render a development uneconomic are reviewed by the committee under the same exacting standard as a denial: the board bears the burden of demonstrating that the conditions it imposed “are consistent with local needs.” Id. Absent a showing that conditions placed on an approval render the project uneconomic, the committee is not empowered to review them under the denial standard.24
[595]*595The committee maintains that the goal of the act “is to increase the supply of affordable housing and to locate that housing in communities where there is a particular shortage of housing for persons of low income,” Zoning Bd. of Appeals of Wellesley v. Ardemore Apartments Ltd. Partnership, supra at 827, and that its interpretation of the act is in furtherance of that purpose. This position “seems, at most, to be that such a power would be helpful in effectuating the legislative purpose underlying [the act]. That is quite possibly true, but it is not a basis for this court to invest the [committee] with powers beyond those given it by the Legislature.” Board of Appeals of N. Andover v. Housing Appeals Comm., 4 Mass. App. Ct. 676, 680 (1976).25
3. Conclusion. By written decision on September 10, 2001, [596]*596the board approved the developer’s application for a comprehensive permit under the act, attaching fifty conditions to its approval. On appeal, the committee determined that the developer failed to demonstrate that the conditions set by the board rendered the “building or operation of such housing uneconomic,” G. L. c. 40, § 22, and the Superior Court judge concluded that this determination was supported by substantial evidence. The board, therefore, complied with the act in granting a comprehensive permit with conditions that were determined not to be uneconomic, and the committee lacked the power to revise or revoke those conditions.
To the extent the judgments below affirmed the committee’s alteration of the board’s conditions, those judgments are reversed. Judgments shall enter in favor of the board, and the comprehensive permit shall remain as originally granted, with all conditions intact except for condition number twenty imposing a 300-foot no-build buffer zone, which the board withdrew before the committee issued its first decision.
So ordered.