A practical line-by-line check before you sign
Short answer: compare renovation quotes line by line, not just by the final total. The key questions are what is included, what is only an allowance, what is excluded, how variations are approved, when payments fall due and who is responsible for each part of the programme.
Two quotes can look as if they describe the same renovation while covering very different work. One may include demolition, waste, first and second fix, decorating and protection. Another may leave several of those items as assumptions or provisional sums.
The lowest number is not automatically wrong and the highest is not automatically complete. A useful quote makes it possible to see what you are buying and where the budget can still move.
Check your quote before you sign
Renovation quote comparison checker
Tick each point only if the quote answers it clearly.
1. Start with a clear scope
A renovation quote should make the work easy to follow. For a full-house project, a room-by-room or trade-by-trade breakdown is usually more useful than one paragraph covering everything. It should distinguish strip-out, structural work, carpentry, plumbing, electrical work, plastering, tiling, decoration and final fittings.
Look for the boundary between contractor work and client-supplied items. If you are buying the kitchen, sanitaryware, lighting or flooring, the quote should still explain who unloads, stores and installs it, and what happens if delivery is late.
2. Check demolition, protection and waste
Renovation creates disruption before it creates a finished room. Ask whether the quote includes floor and furniture protection, dust control, temporary screens, removal of old fittings, skips or waste collection, and cleaning at the end of each stage.
Access matters in London. Parking restrictions, stairs, shared entrances and limited storage can affect labour and logistics. The quote should state the access assumptions it is based on.
3. Separate fixed items from provisional sums
A provisional sum is an allowance for work that cannot yet be priced accurately. It may be reasonable when the condition of a wall, floor or service is hidden. It should not be mistaken for a fixed price.
A prime cost or PC allowance is normally a budget for a supply item such as tiles, sanitaryware or a fitting. If the chosen item costs more than the allowance, the final price changes. Ask whether labour, delivery, waste and associated materials are included as well as the item itself.
4. Read the exclusions and assumptions
Exclusions are not automatically a problem. Unclear exclusions are. Check whether the price covers scaffolding, building-control fees, structural engineer input, temporary power or water, making good outside the work area, decorating, floor preparation and final certification.
Confirm how VAT is shown. Do not assume that every figure has the same tax treatment. If a commercial point is unclear, ask the contractor or your own adviser before signing.
5. Understand structure and services
If walls are being removed or openings changed, the quote should connect to the engineer's information. It should be clear who supplies steelwork, padstones, temporary support and any building-control information.
For plumbing, heating and electrical work, check both first fix and second fix. Moving a kitchen or bathroom can involve drainage, hot and cold supplies, ventilation, consumer-unit capacity, testing and commissioning. A short phrase such as “electrics included” does not explain the extent of the work.
6. Compare the programme, not only the price
A quote should explain the expected sequence, what must be ready before the contractor starts and which client decisions could block progress. It should also identify long-lead items and any periods when parts of the house will be without a kitchen, bathroom, heating or power.
The programme is not a guarantee against every delay. Hidden defects, client changes and third-party decisions can affect it. The useful question is how the contractor records changes and keeps you informed. For extension projects, use our London house extension timeline guide to understand the pre-start and build stages.
7. Tie payments to clear stages
Ask for a payment schedule that matches visible milestones or agreed delivery stages. The document should explain the deposit, interim payments, final payment and how retention or outstanding items are handled, if applicable.
Large upfront payments deserve careful questions. Some advance payment may be needed for mobilisation or ordered materials, but you should understand exactly what it covers. Keep the agreed quote, payment schedule and approved variations together.
8. Make variations a written process
Renovations can change once work begins. A client may choose a different finish, or the team may uncover a condition that could not be seen before opening up. The quote or contract should explain how a variation is described, priced and approved before extra work proceeds.
Verbal decisions are easy to remember differently. A short written record protects both the homeowner and contractor and keeps the running budget clearer.
9. Ask for insurance, warranty and handover details
Ask the contractor to provide current insurance information that is relevant to the job. Confirm what workmanship warranty is offered, what it covers and how long it lasts. Do not rely on a broad promise without written details.
Handover may include electrical or gas certificates where relevant, product information, guarantees, building-control documentation and an agreed list of final items. The quote should show who is responsible for collecting those documents.
10-point quote comparison recap
- Compare the same drawings, scope and specification.
- Check demolition, protection, access and waste.
- List every provisional sum and PC allowance.
- Read exclusions and VAT treatment.
- Confirm structural work and engineer responsibilities.
- Check first and second fix services.
- Identify client-supplied items and installation responsibility.
- Review the programme and communication process.
- Tie payments and variations to written stages.
- Confirm insurance, warranty and handover paperwork.
For a wider budget view, read the existing full-house renovation cost breakdown. To see finished work, browse BCS extension and renovation projects.
Want a quote you can read and compare?
See the BCS house renovation service or request a free quote. We can review the scope, access and finish expectations before pricing the work.
