Know what your project should cost
Before you appoint a builder, know what the work should cost on current UK rates. Realistic, room by room, in £/m².
Itemised pre build budget
§01Services
CostclarityforUKhomeowners.
Independent advice on what your extension, loft, basement or refurbishment should cost, and plain-English help when builders' quotes disagree.
§02Catalogue
Builder quote review
We compare your builder quotes line by line. We tell you which is honest, which has loaded the prelims, and which is missing scope.
Quote comparison report
Catch the overcharge mid build
Monthly checks on what your builder is claiming versus what is actually built on site. Surprises caught before you pay them.
Monthly cost check plus payment sign off
Party wall, planning and VAT advice
Plain English help on the things that move UK home build cost: Party Wall Act 1996, planning conditions, 20% VAT on most refurb and extension work.
Written advice and cost impact
Spec and value engineering advice
Trade offs between finishes, structure and programme, costed clearly so you can decide what stays and what goes.
Spec options with cost impact
Snagging, retention and dispute support
If your builder is over claiming, withholding the snagging list, or refusing to release retention, we get to the bottom of it.
Independent assessment report
Looking for the professional services? Switch over.
§03Detail
Service detail, pricing, process, FAQs.
Every Costed service has its own page with indicative fees, a worked process, and answers to the questions buyers actually ask before they appoint.
Homeowner Cost Consultancy
Before you appoint a builder, you should know what the work should cost. Costed prepares independent pre-build budgets for extensions, loft conversions, basements and full renovations, then reviews contractor quotes line by line. The single best protection against overruns is knowing the number before the first quote lands.
Read more about Homeowner Cost Consultancy
Extension Budget Review
An Extension Budget Review is an independent, itemised cost estimate for your extension, loft or refurbishment, written from your drawings and current UK rates. It gives you the real number before you brief a single builder, so quotes can be tested against a proper benchmark, not hope. Typical UK turnaround: 5–8 working days from receipt of drawings.
Read more about Extension Budget Review
Builder Quote Audit
A Builder Quote Audit is an independent line-by-line review of one or more contractor quotes for your home project. We test each quote against the drawings, the specification and current UK rates, flagging missing items, inflated allowances, vague provisional sums and contract terms that quietly hand the builder the right to charge more later. Turnaround: 3–5 working days per quote.
Read more about Builder Quote Audit
Snagging Cost Report
A Snagging & Final Cost Report is an independent inspection and cost review at practical completion of your home project. We identify defective and incomplete work, attach a realistic cost to put each item right, and tell you how much should fairly be retained from the final payment until snagging is closed out. Most UK builders quietly accept a properly evidenced retention, and the fee is recovered many times over.
Read more about Snagging Cost Report
Know what your project should cost. Before you build it.
One UK working day response. Fixed-fee proposal, VAT inclusive. No retainer. No obligation.