the “changes” clause, Article 3 of the prime contract, requires that any changes in the plans or specifications be made by written order of the government contracting officer. No such order was issued in this case. Secondly, the “disputes” clause, Article IS of the prime contract,3 expressly provides that the procedure it sets forth will apply “[ejxcept as otherwise specifically provided in this contract, * Under the Special Stipulations to the prime contract, Paragraph 18 specifically deals with subcontracts, and subparagraph (e) of Paragraph 18 provides as follows:
(e) The Government of the District of Columbia will not undertake to settle any differences between the contractor and his subcontractor or between subcontractors.
Clearly, then, by the very terms of the “disputes” clause, this stipulation preempts any obligation appellee might otherwise have had to follow the procedure provided by the “disputes” clause for prime contractors — that clause is inapplicable to subcontractors who, of course, by subpara-graph (a) of Paragraph 18, have in no way entered into a contractual relationship with the District of Columbia. Because of the express language in the prime contract itself, noted by the trial judge, this court cannot accept appellant’s argument that ap-pellee was obliged to perform in accordance with appellant’s interpretation of the contract.
Appellant’s third argument is that the court erred in permitting appellee to abandon the subcontract. However, the trial judge in fact did not so hold. Rather, in his written findings, the judge ruled that “the [appellee’s] duty of performance was dependent upon the existence of conditions shown by the drawings and specifications. The [appellee] was therefore legally justified in refusing to complete its contract, because of the default of the [appellant] in failing to have fine filter installed, which prevented the [appellee] from properly performing the subcontract.” (Emphasis supplied.)
There is no doubt that hindrance or prevention of performance constitutes a breach of contract, absent a provision expressly contemplating such hindrance or prevention.4 As this court stated in Horlick v. Wright, D.C.Mun.App., 104 A.2d 825, 827 (1954), “It is a principle of fundamental justice that if a promisor is himself the cause of the failure of performance * he cannot take advantage of the failure.” [Citation omitted.]5
Here, the trial court’s findings indicated that the hindrance or prevention found was of two kinds. First, an owner (or prime contractor) “commits a breach of a construction contract by changing plans and specifications otherwise than the contract permits and ordering substituted performance.” Oberer Construction Co. v. Park Plaza, Inc., 179 N.E.2d 168, 170 (Ohio Com. P1.1961).6 Here, as has been pointed out above, appellant sought to order a different performance from that called for in the plans and specifications, without the required written change order, and thereby prevented appellee from properly performing.
Second, where an “act to be done by one party can be done only on a corre
3
.Article 15. Disputes. — Except as otherwise specifically provided in this contract, all disputes concerning questions arising under this contract shall be decided by the contracting officer subject to written appeal by the contractor within thirty (30) days to the Contract Appeals Board, whose decision shall bo final and conclusive upon the parties thereto, subject to the limitations of Sec. 3(b) (2) of Reorganization Plan No. 5 of 1952. In the meantime the contractor shall diligently proceed with the work as directed.
4
Corbin on Contracts, § 947 (1960 ed.).
5
And see Matthew A. Welch & Sons, Inc. v. Bird, D.C.App., 193 A.2d 736 (1963).
6
Corbin on Contracts, § 947 (1960 ed.); and see 17A C.J.S. Contracts § 468 (1963).