Why do renovation quotes vary so much?
Two builders can look at the same house and price different jobs. One quotation may include a finished room; another may leave services, materials or decoration to be confirmed. Before comparing the totals, establish what each price includes and which assumptions sit behind it.
Check what the price is based on
Prices can still differ when the work is the same. Each builder’s price also needs to cover business overheads, time spent managing the project, risk and profit. Builders may allow for these differently and propose different teams or programmes. Ask what the remaining price gap reflects.
An early estimate gives an indication of cost. A detailed written quotation prices a defined job. Check the document itself: what information supports it, how long is it valid, and in what circumstances could the price change? A heading that says ‘quote’ cannot explain an unclear scope.
Give every builder the same drawing revisions, specification and schedule of work, including access and timing. When a question changes the brief, share the answer with everyone.
Follow the work through to a finished room
A line such as ‘remove wall’ does not tell you whether the price also covers associated structural work, moving sockets, repairing the ceiling, joining the floor finishes and decorating the affected surfaces. Ask where each builder’s responsibility ends.
For a kitchen, confirm who supplies the units, worktops and appliances, and whether fitting, connections and making good are included. Record any owner-supplied items and who handles delivery.
A small example of a misleading comparison
Consider this fictional comparison for the same room. Quote A is £20,000 and Quote B is £17,000, both on the same VAT basis:
Floor finish: Quote A includes supply and fitting. Quote B includes fitting only.
New sockets: Quote A includes supply and fitting as specified. Quote B includes a provisional allowance.
Decoration: Included in Quote A; excluded from Quote B.
Builder B then confirms a net addition of £2,500 to match Quote A’s scope, allowing for the provisional sum already included. Quote B becomes £19,500. The initial £3,000 gap is now £500.
Keep each original total beside the confirmed adjustments. A blank line is a question to resolve, not a zero cost.
Separate allowances from settled prices
If a quotation contains an allowance or provisional sum, ask which work or selection remains undecided, what quantity and quality it assumes, and how the eventual cost will be reconciled. A small allowance can lower the headline total while leaving a significant decision open.
Check whether the allowance is already included in the quotation total. If it is, adding the full eventual cost on top would count part of the work twice. Record the allowance, the confirmed replacement cost and the adjustment method agreed with the builder. Keep unresolved amounts visible until they can be priced.
Compare the conditions as well as the construction
Access, protection of occupied rooms, waste removal and the proposed sequence can affect the work involved. A builder pricing an empty house may have assumed a different job from one planning around a household living there. Confirm the same starting conditions, then compare proposed start dates and duration.
Confirm whether VAT is included where applicable, and identify costs you will pay separately. The builder’s price and your total project budget are different figures: professional fees, statutory charges or owner purchases may sit outside the building quotation. Mark these clearly so they do not disappear from your budget or get counted twice.
Ask for one revised, comparable breakdown
Bring the differences into a single list. For each quotation, record what is included, what is excluded, what remains an allowance and what needs clarification. Send the relevant questions to each builder and ask for a revised written breakdown against the agreed scope.
Compare relevant previous work, references and who will manage the project alongside the price. The size of the quotation alone tells you little about the quality of the work.
Before appointing a builder, bring the agreed scope, price, payment stages and programme into the written contract. Agree how proposed changes will be described, priced and approved, including their effect on time. That gives both sides a clear reference when a decision changes.
If you are preparing to approach builders, talk to TNCO about the drawings, specifications and scope information your project needs. A clear pricing brief makes it easier to understand what you are being offered and choose on more than the total at the bottom of the page.
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