Know the number before you build.
Independent cost planning, quote intelligence and contract control, protecting margin and programme on residential, development and construction projects.
Independent cost advisory. Paid by you, never your builder.
The number behind a
stronger build
outcome.
Costed prepares the commercial case behind UK construction projects. We benchmark cost plans against live quote data, draft Bills of Quantities from drawings, scrutinise builder quotes and administer your build contract and your build contract contracts. Senior input from first review through to the closing out the build.
About CostedCost planning
elemental cost plans benchmarked to live UK quote data, from design stage to 4.
Bills of quantities
-compliant priced specs prepared from drawings and specifications for fair, like-for-like quotes.
Quote analysis
Quote strategy, contractor selection and forensic comparison of returns before you commit.
Contract administration
Valuations, variations, instructions and EOT review under your build contract.
Loan monitoring
Independent lender oversight monitoring surveyor reports and drawdown certification for lenders.
Closing out the build
Closing the commercial position. Variations, retention and defects reconciled to contract.
What usually goes wrong. What we do instead.
Builder quotes that range from £180k to £320k for the same job
Independent cost estimate so you know which quote is real
Provisional sums and PC sums you don't understand
Plain-English audit of every line before you sign
Variations and 'extras' adding £30k mid-build
Monthly cost checks. Variations challenged in writing
VAT, party wall and retention surprises at the end
All flagged at quote stage. No end-of-job shocks
Fee creep and woolly scope from the surveyor
Fixed fee, written proposal in one UK working day
Surveyor recommended by the builder, whose side are they on?
Paid by you. Never your builder
Three steps. No mystery.
- 01
Send the brief
Drawings, scope or a few lines. By email or upload.
- 02
Fee proposal in one UK working day
Fixed fee, VAT inclusive. Scope, deliverables and timeline set.
- 03
We deliver
Cost plan, priced spec, quote analysis or post-contract control. Issued in Excel and PDF.
Straight numbers. Said back to us.
“Our builder's quote came in at £214k. Costed's audit flagged £41k of provisional sums and an over-measured kitchen. The final fixed price was £179k.”
“Our only job is to give you a straight number. We don't take referral fees, we don't moonlight for contractors, and we're paid by the client only. That's the whole proposition.”
Developers
Independent cost plans, priced specs, builder quotes analysis and monthly monitoring across SME and mid-market schemes.
Architects
Cost plans aligned to design stage to 4 so design progresses on budget. We sit alongside, we do not compete.
Contractors
Adjudication support, EOT and loss and expense narratives, closing out the build agreement on your build contract.
Homeowners
Independent quote audits, fixed-price cost reviews and monthly cost checks for sensitive residential projects.
- Single-family townhouse refurbishment, Kensington (£2.5m to £5m)
- Mixed-use development, Southwark (£1m to £2.5m)
- Warehouse to office conversion, Hackney (£1m to £2.5m)
- Two-storey side and rear extension, Richmond (£500k to £1m)
- New Build House Cost per m² UK 2026: self-build, plot to PC, with the 0% VAT route
- Loft Conversion Cost UK 2026: dormer, mansard, hip-to-gable and rooflight, priced
- Kitchen Extension Cost UK 2026: build, kitchen FF&E and the PC sum trap
- House Extension Cost UK 2026: single, double, side-return, wrap-around and kitchen
Ready to talk through your project?
Send the brief: drawings, scope or a few lines. A senior surveyor replies within one UK working day with a fixed-fee, VAT-inclusive proposal. No obligation.