The question presented by this case is whether the constructive grant provision of G. L. c. 40A, § 15, applies to a proceeding for reconsideration, sometimes called a repetitive petition, of a previously denied zoning variance pursuant to G. L. c. 40A, § 16.

On May 22, 1986, the board of appeals of Barnstable (board of appeals) denied the plaintiff’s petition for a variance to be allowed to enlarge, alter and convert to office use a dwelling in a residence zone. The plaintiff thereafter made site and building changes in his proposal and filed with the town clerk on January 20, 1987, another petition for variance for the same use.

*578General Laws c. 40A, § 16, provides, in pertinent part, that no application or petition which has been unfavorably and finally acted upon by a permit granting authority (the board of appeals) shall be favorably acted upon within two years of the negative decision unless (1) the board of appeals finds that there are specific and material changes in the subsequent proposal, see Ranney v. Board of Appeals of Nantucket, 11 Mass. App. Ct. 112, 115-118 (1981), and (2) the planning board consents to the board of appeal’s reconsideration.1

On January 29, 1987, the board of appeals by unanimous vote found specific and material changes in the second proposal. The town’s planning board on March 9, 1987, also by unanimous vote, consented to reconsideration. A public hearing on the repetitive petition was held by the board of appeals on May 14, 1987. At that hearing, the plaintiff took the position that the requested variance had been constructively granted under the provisions of G. L. c. 40A, § 15, as 114 days had then passed since the filing of the second petition with the town clerk on January 20, 1987; the plaintiff also presented the merits of his request.

The board of appeals voted on September 17, 1987, to deny the petition and filed its written decision with the town clerk on October 29, 1987. The plaintiff filed an appeal pursuant to G. L. c. 40A, § 17. The board of appeals filed no answer. On the plaintiff’s motion for summary judgment, a Superior Court judge granted summary judgment to the board. See Mass.R.Civ.P. 56(c), 365 Mass. 824 (1974). On the undisputed facts, the judge concluded that the constructive grant provision of G. L. c. 40A, § 15, did not apply to a repetitive petition for a variance under G. L. c. 40A, § 16. In the alternative, the judge ruled that the variance could not have been constructively granted when the facts, as matter of law, did not permit the granting of a variance. See G. L. c. 40A, § 10.

*579General Laws c. 40A, § 15, as appearing in St. 1975, c. 808, 3, applicable to this case, provided that failure of a board of appeals to act on a petition for a variance within seventy-five days of the filing of the petition with a city or town clerk would be deemed to constitute a grant of the variance.2 See Rinaudo v. Zoning Bd. of Appeals of Plymouth, 383 Mass. 885, 885 (1981); Capone v. Zoning Bd. of Appeals of Fitchburg, 389 Mass. 617, 621-624 (1983); Noe v. Board of Appeals of Hingham, 13 Mass. App. Ct. 103, 108 (1982); Cameron v. Board of Appeals of Yarmouth, 23 Mass. App. Ct. 144, 147-148 (1986). If the petition for a variance had been an original one, the variance would have been constructively granted by the board of appeal’s inaction. The petition here, however, was a renewed one. Section 16 of G. L. c. 40A is silent as to any time for action by either the board of appeals or the planning board on the threshold questions entrusted to each or by the board on the merits of the renewed petition.

The purpose of the constructive grant provision of § 15 “is to induce the board to act promptly.” Capone v. Zoning Bd. of Appeals of Fitchburg, 389 Mass. at 623, citing Noe v. Board of Appeals of Hingham, supra at 110 (Dreben, J., dissenting). The plaintiff argues that it would be consistent with that end to read the procedural requirements of § 15 into § 16. Although neither statute refers to the other, a literal reading of the two might support that approach. Thus, it would be required that a hearing on a repetitive petition be held within sixty-five days from the receipt by the board of appeals of a copy of the petition from the city or town clerk, that a decision be rendered within seventy-five days of the filing of the petition, and that the decision be filed within fourteen days with the clerk. Other procedural requirements must clearly be read with § 16. See, e.g., G. L. c. 40A, § 11 (notice requirements for public hearings).

*580While we must give statutes a reasonable construction so that the purpose of the Legislature may be accomplished, see Capone v. Zoning Bd. of Appeals of Fitchburg, 389 Mass. at 622-623, “we will not ‘read into the statute a provision which the Legislature did not see fit to put there, whether the omission came from inadvertence or of set purpose.’” Sterilite Corp. v. Continental Cas. Co., 397 Mass. 837, 839 n.3 (1986), quoting from King v. Viscoloid Co., 219 Mass. 420, 425 (1914). Moreover, we should not make a construction which may produce an unworkable scheme or one which allows for frustration of function.

In the case of an original application or petition, the constructive grant provision of § 15 applies to proceedings which are entirely within the board of appeal’s control. In the case of a repetitive petition, § 16 introduces the additional element of planning board approval. The board of appeals has no authority over the planning board’s timing of its hearings or decisions.3 If a planning board does not act, purposefully or not, within the time frame prescribed for board of appeals action under §15, could the Legislature have intended that an application be deemed granted by the board of appeals? We hold that it did not and that the constructive grant provision of § 15 does not apply to a repetitive petition filed under § 16. To conclude otherwise would open the possibility of the planning board, in effect, exercising an essential function of the board of appeals.

*581Section 16 requires planning board involvement only as a precedent to favorable board of appeals action. It might be argued that nothing in § 16 prevents a board of appeals from acting (without planning board consent) unfavorably on a repetitive petition (either on a finding that the requisite change has not been shown or on the merits) within the time constraints set out in § 15.4 However, a board of appeals, finding “specific and material changes” in a petition under § 16, might be favorably disposed to grant a variance but also to attach appropriate “conditions, safeguards and limitations.” G. L. c. 40A, § 10. Planning board inaction or delay — if a constructive grant were the result — would frustrate the imposition of such restrictions.

While some time limits (both as to threshold and final decision) on planning board and board of appeals action on a repetitive petition would appear to be consistent with legislative intent to prod prompt decision once votes are made which allow reconsideration, those are, in the circumstances, matters calling for explicit consideration and the exercise of judgment by the Legislature.5

In view of our disposition, we need not reach the propriety of the judge’s alternative ruling that the variance requested was beyond the authority of the board to grant. But see Elder *582Care Servs., Inc. v. Zoning Bd. of Appeals of Hingham, 17 Mass. App. Ct. 480 (1984). The plaintiff makes no argument that the board’s denial of the variance exceeded its authority. See G. L. c. 40A, § 17.

Judgment affirmed.