Homeowner guides · Build planning and quotes · Published 5 October 2026
How to compare London building quotes by scope, not just totals
A practical way to compare London building quotes by drawings, assumptions, inclusions, exclusions, responsibilities, programme and change handling.
Make each quote describe the same project
Comparing building quotes starts before the numbers appear. Give each builder the same current drawings, specification, room schedule and written brief, then ask them to identify what they have allowed for. If one person prices a sketch and another prices a coordinated design, the totals answer different questions. A clear issue date and drawing list help you spot when a quote is based on an earlier version.
Read the scope as a description of the finished project. Look for the work that is easy to see and the work that sits behind it: protection, access, preparation, temporary arrangements, structural coordination, service changes, finishes, testing, cleaning and handover information. Ask how existing items will be retained, repaired or made good. A short line such as complete kitchen or bathroom may hide many decisions that matter to you.
Separate confirmed inclusions from assumptions and exclusions. A quote can be honest about uncertainty if it names the question and explains how it will be resolved. Ask what has been inspected, what remains unknown and which items are allowances that may change after a design or site decision. The aim is a shared scope that can be discussed, not a false sense of precision.
Compare responsibilities and change routes
Drawings do not build the project by themselves, so identify who owns each coordination task. Ask who will lead design queries, structural information, service layouts, product selections, approvals conversations, site decisions and handover. If a kitchen supplier, specialist installer or separate designer is involved, show how their information reaches the builder. A clear responsibility map reduces gaps between packages.
Ask each builder to explain the proposed sequence, access, working hours, deliveries, protection and the decisions needed from you. A programme should show dependencies and open questions, not just a start and finish statement. If you will live at home, discuss how the plan affects rooms, services and household routines. You can then compare the practical fit of each proposal as well as its scope.
Agree how changes will be described and confirmed. When an existing condition appears or you choose a different finish, ask for the affected drawing, scope item, timing and cost implication to be stated before the work proceeds. Keep a decision log and the latest quotation together. The exact contract route should be explained by the appropriate professional; this article is about making the project description readable.
Building-quote comparison checklist
Use this list when reviewing each proposal:
- Confirm the same drawings, specification, room schedule and issue date were used.
- Mark inclusions for protection, preparation, structural work, services and finishes.
- List exclusions, assumptions, allowances and unresolved site information.
- Identify who owns design coordination, specialist packages and handover.
- Compare access, working sequence, deliveries and the effect on your household.
- Ask what decisions are needed, by when and how they will be recorded.
- Check how changes, substitutions, making-good and defects will be explained.
Read each proposal once for what it says and again for what you expected but cannot find. Mark questions beside the relevant drawing or room rather than keeping a separate list with no reference. The resulting conversation is more useful than choosing a proposal from a total that leaves key assumptions invisible.
The clearest quote is the one you can read alongside the drawings and understand as a plan for the finished home. For help preparing a coordinated brief before inviting proposals, book the free Suddeco Homes survey. Bring the current scope, drawings and the questions that make each proposal difficult to compare.