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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.
52.243-3 Changes—Time-and-Materials or Labor-Hours.
As prescribed in 43.205(c), insert the following clause:
Changes—Time-and-Materials or Labor-Hours (SEP 2000)
(a) The Contracting Officer may at any time, by written order, and without notice to the sureties, if any, make changes within the general scope of this contract in any one or more of the following:
(1) Description of services to be performed.
(2) Time of performance (
i.e.,
hours of the day, days of the week, etc.).
(3) Place of performance of the services.
(4) Drawings, designs, or specifications when the supplies to be furnished are to be specially manufactured for the Government in accordance with the drawings, designs, or specifications.
(5) Method of shipment or packing of supplies.
(6) Place of delivery.
(7) Amount of Government-furnished property.
(b) If any change causes an increase or decrease in any hourly rate, the ceiling price, or the time required for performance of any part of the work under this contract, whether or not changed by the order, or otherwise affects any other terms and conditions of this contract, the Contracting Officer will make an equitable adjustment in any one or more of the following and will modify the contract accordingly:
(1) Ceiling price.
(2) Hourly rates.
(3) Delivery schedule.
(4) Other affected terms.
(c) The Contractor shall assert its right to an adjustment under this clause within 30 days from the date of receipt of the written order. However, if the Contracting Officer decides that the facts justify it, the Contracting Officer may receive and act upon a proposal submitted before final payment of the contract.
(d) Failure to agree to any adjustment will be a dispute under the Disputes clause. However, nothing in this clause excuses the Contractor from proceeding with the contract as changed.
(End of clause)
[65 FR 46073, July 26, 2000]
43.205(c)
(c) Insert the clause at 52.243-3, Changes-Time-and-Materials or Labor-Hours, in solicitations and contracts when a time-and-materials or labor-hour contract is contemplated. The contracting officer may vary the 30-day period in paragraph (c) of the clause according to agency procedures.
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.
RFORFO VersionOverhauled 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.
(c) Insert the clause at 52.243-3, Changes-Time-and-Materials or Labor-Hours, in solicitations and contracts when a time-and-materials or labor-hour contract is contemplated. The contracting officer may vary the 30-day period in paragraph (c) of the clause according to agency procedures.
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
52.243-3 Changes-Time-and-Materials or Labor-Hours.
eCFR (codified)
RFO (implemented)
1 added, 1 removed
As prescribed in 43.205(c), insert the following clause:
As prescribed in 43.305(c), insert the following clause:
3 added, 3 removed
Changes—Time-and-Materials or Labor-Hours (SEP 2000)
Changes-Time-and-Materials or Labor-Hours (Deviation Date)
35 removed
(a)
(a) The Contracting Officer may at any time, by written order, and without notice to the sureties, if any, make changes within the general scope of this contract in any one or more of the following:
(a)
(a)
28 added, 5 removed
(1)
(1) Description of services to be performed.
(1)
(1) At any time, the Contracting Officer may issue a written order to make changes in within the scope of this contract in any one or more of the following:
6 added, 13 removed
(2)
(2) Time of performance (i.e., hours of the day, days of the week, etc.).
(2)
(i) Description of services to be performed.
10 added, 3 removed
(3)
(3) Place of performance of the services.
(3)
(ii) Time of performance (i.e., hours of the day, days of the week, etc.).
6 added, 26 removed
(4)
(4) Drawings, designs, or specifications when the supplies to be furnished are to be specially manufactured for the Government in accordance with the drawings, designs, or specifications.
(4)
(iii) Place of performance of the services.
13 added, 7 removed
(5)
(5) Method of shipment or packing of supplies.
(5)
(iv) Drawings, designs, or specifications which require special manufacturing of supplies for the Government.
7 added, 3 removed
(6)
(6) Place of delivery.
(6)
(v) Method of shipment or packing of supplies.
3 added, 4 removed
(7)
(7) Amount of Government-furnished property.
(7)
(vi) Place of delivery.
5 added
(vii)
(vii)
(vii) Amount of Government-furnished property.
19 added
(2)
(2)
(2) If there are any sureties, the Contracting Officer does not need to notify them of a written order.
(b)
(b) If any change causes an increase or decrease in any hourly rate, the ceiling price, or the time required for performance of any part of the work under this contract, whether or not changed by the order, or otherwise affects any other terms and conditions of this contract, the Contracting Officer will make an equitable adjustment in any one or more of the following and will modify the contract accordingly:
(b)
(b) If any change causes an increase or decrease in any hourly rate, the ceiling price, or the time required for performance of any part of the work under this contract, whether or not changed by the order, or otherwise affects any other terms and conditions of this contract, the Contracting Officer will make an equitable adjustment in any one or more of the following and will modify the contract accordingly:
(1)
(1) Ceiling price.
(1)
(1) Ceiling price.
(2)
(2) Hourly rates.
(2)
(2) Hourly rates.
(3)
(3) Delivery schedule.
(3)
(3) Delivery schedule.
(4)
(4) Other affected terms.
(4)
(4) Other affected terms.
(c)
(c) The Contractor shall assert its right to an adjustment under this clause within 30 days from the date of receipt of the written order. However, if the Contracting Officer decides that the facts justify it, the Contracting Officer may receive and act upon a proposal submitted before final payment of the contract.
(c)
(c) The Contractor shall assert its right to an adjustment under this clause within 30 days from the date of receipt of the written order. However, if the Contracting Officer decides that the facts justify it, the Contracting Officer may receive and act upon a proposal submitted before final payment of the contract.
(d)
(d) Failure to agree to any adjustment will be a dispute under the Disputes clause. However, nothing in this clause excuses the Contractor from proceeding with the contract as changed.
(d)
(d) Failure to agree to any adjustment will be a dispute under the Disputes clause. However, nothing in this clause excuses the Contractor from proceeding with the contract as changed.
(End of clause)
(End of clause)
6 removed
[65 FR 46073, July 26, 2000]
Prescription
Minor revisions. The RFO prescription has formatting or editorial changes from the eCFR prescription.
eCFR (codified)
RFO (implemented)
Unchanged
52.243-3 Changes-Time-and-Materials or Labor-Hours.: Prescription
eCFR (codified)
RFO (implemented)
1 added, 1 removed
(c)
(c) Insert the clause at 52.243-3, Changes-Time-and-Materials or Labor-Hours, in solicitations and contracts when a time-and-materials or labor-hour contract is contemplated. The contracting officer may vary the 30-day period in paragraph (c) of the clause according to agency procedures.
(c)
(c) Insert the clause at 52.243-3, Changes-Time-and-Materials or Labor-Hours, in solicitations and contracts when a time-and-materials or labor-hour contract is anticipated. The contracting officer may vary the 30-day period in paragraph (c) of the clause according to agency procedures.