RFO
RFO Version Available
The Revolutionary FAR Overhaul has published a revised version of this clause. The RFO version supersedes the eCFR text below for contracts using the RFO model; see the RFO deviation for applicability.
View RFO version52.243-5 Changes and Changed Conditions. As prescribed in 43.205(e), insert the following clause: Changes and Changed Conditions (APR 1984) (a) The Contracting Officer may, in writing, order changes in the drawings and specifications within the general scope of the contract. (b) The Contractor shall promptly notify the Contracting Officer, in writing, of subsurface or latent physical conditions differing materially from those indicated in this contract or unknown unusual physical conditions at the site before proceeding with the work. (c) If changes under paragraph (a) or conditions under paragraph (b) increase or decrease the cost of, or time required for performing the work, the Contracting Officer shall make an equitable adjustment (see paragraph (d)) upon submittal of a proposal for adjustment (hereafter referred to as proposal) by the Contractor before final payment under the contract. (d) The Contracting Officer shall not make an equitable adjustment under paragraph (b) unless— (1) The Contractor has submitted and the Contracting Officer has received the required written notice; or (2) The Contracting Officer waives the requirement for the written notice. (e) Failure to agree to any adjustment shall be a dispute under the Disputes clause. (End of clause) [48 FR 42478, Sept. 19, 1983, as amended at 60 FR 34761, July 3, 1995]
43.205(e)
(e) The contracting officer shall insert the clause at 52.243-5, Changes and Changed Conditions, in solicitations and contracts for construction, when the contract amount is not expected to exceed the simplified acquisition threshold.
Prescription data sourced from eCFR as of 2026-06-10 03:16 UTC.
Cross-references within the prescription are not resolved automatically.
Regulatory Stack
The layers of regulation that govern this clause, from the FAR prescription through agency-specific supplements and any active deviations.
RFO
RFO Version
Overhauled clause text
The Revolutionary FAR Overhaul publishes a revised version of this clause. See the RFO Version tab for the controlling authority under the RFO model.
FAR
FAR Prescription
43.205(e)
(e) The contracting officer shall insert the clause at 52.243-5, Changes and Changed Conditions, in solicitations and contracts for construction, when the contract amount is not expected to exceed the simplified acquisition threshold.
Version History
Version history is sourced from the codified eCFR. Changes published only as class deviations or by the Revolutionary FAR Overhaul do not appear here until they are incorporated into the eCFR. For RFO-driven changes see the RFO Version tab and any active deviations cited above.
No version history available from eCFR.
RFO Version
Comparison of the codified eCFR text against the Revolutionary FAR Overhaul revision. Highlights show additions (green) and deletions (red, struck through).
Clause Text
Substantive changes. The RFO version differs materially from the eCFR text.
eCFR (codified)
RFO (implemented)
Unchanged
52.243-5 Changes and Changed Conditions.
eCFR (codified)
RFO (implemented)
1 added, 1 removed
As prescribed in 43.205(e), insert the following clause:
As prescribed in 43.305(e), insert the following clause:
2 added, 2 removed
Changes and Changed Conditions (APR 1984)
Changes and Changed Conditions (Deviation Date)
4 added, 5 removed
(a)
(a) The Contracting Officer may, in writing, order changes in the drawings and specifications within the general scope of the contract.
(a)
(a) The Contracting Officer may order changes in the drawings and specifications within the scope of the contract in writing.
10 added, 1 removed
(c)
(c) If changes under paragraph (a) or conditions under paragraph (b) increase or decrease the cost of, or time required for performing the work, the Contracting Officer shall make an equitable adjustment (see paragraph (d)) upon submittal of a proposal for adjustment (hereafter referred to as proposal) by the Contractor before final payment under the contract.
(c)
(c) If changes under paragraph (a) of this clause or conditions under paragraph (b) of this clause increase or decrease the cost of, or time required for performing the work, the Contracting Officer shall make an equitable adjustment (see paragraph (d) of this clause) upon submittal of a proposal for adjustment (hereafter referred to as proposal) by the Contractor before final payment under the contract.
3 added
(d)
(d) The Contracting Officer shall not make an equitable adjustment under paragraph (b) unless—
(d)
(d) The Contracting Officer shall not make an equitable adjustment under paragraph (b) of this clause unless—
4 added, 2 removed
(1)
(1) The Contractor has submitted and the Contracting Officer has received the required written notice; or
(1)
(1) The Contractor has submitted the required written notice and the Contracting Officer has received the notice; or
1 removed
(2)
(2) The Contracting Officer waives the requirement for the written notice.
(2)
(2) The Contracting Officer waives the requirement for written notice.
15 removed
[48 FR 42478, Sept. 19, 1983, as amended at 60 FR 34761, July 3, 1995]
Prescription
No substantive changes. The RFO prescription is identical to the eCFR prescription.
Use with AI assistant
Copy a link and prompt for use with Gemini or another AI assistant.