Most people receive two or three quotes for a building project and then try to decide between them. The difficulty is that most quotes are not comparable documents. One might be four pages with a line-item breakdown by trade. Another might be a single-page PDF with a total and a start date. The third might be a number in an email.
You cannot compare a total to a total if the totals describe different scopes. You can only compare quotes once you know what each one includes, and what each one does not.
What a proper quote should contain
A quote is not an estimate. An estimate is a rough figure to establish order of magnitude. A quote is a written offer to carry out defined work at a defined price. If you are being asked to sign something, you should be signing a quote, not an estimate.
A proper quote for a renovation project will include, at minimum: a written scope of works (what is being done, room by room or trade by trade), the materials and specifications included in the price, a clear list of exclusions, a payment schedule tied to project milestones, a start date and an anticipated programme, and the process for handling variations.
If any of those elements are missing, the quote is incomplete. That does not necessarily mean the builder is untrustworthy. It may mean they are small and informal. But it does mean you are signing something that does not fully define what you are buying.
The exclusions section is where the money hides
Some exclusions are standard and correct. Architects' fees, structural engineers' fees, building control fees, party wall surveyor fees: these are third-party costs that sit outside the builder's scope and are properly excluded. Planning application fees are the client's, not the builder's.
Some exclusions are less obvious and worth questioning. Snagging and making-good: this should be included. Site clearance and waste removal: this should be included. Decoration after plastering: sometimes excluded, worth confirming. Supply of sanitary ware, tiles, kitchen, or brassware: often excluded if you are supplying them yourself, which is a reasonable arrangement, but the labour for fixing them should still be in the price.
The exclusion to watch for is the one that reads something like: "additional works arising from unforeseen conditions." That clause in isolation is not unreasonable. Unforeseen conditions exist. The question is what counts as unforeseen. In a Victorian terrace, a degree of remedial work on old services, lath and plaster removal, or joist-end attention is not unforeseen. It is expected. If those items are excluded from a quote for a Victorian terrace renovation, they will almost certainly become variations.
How to compare quotes fairly
Lay the scope of each quote alongside your brief. Does the scope describe the same project you asked for? Builders sometimes scope a smaller version of the project to produce a lower number. This is not always deliberate, but the result is the same: a number that cannot be meaningfully compared to one that priced the whole thing.
Once you have confirmed that the scopes are equivalent, look at the material specifications. Two bathroom quotes at the same price might describe very different levels of finish. One might include a mid-spec sanitary range and standard tiles. Another might price for a builder's allowance and invite you to upgrade later, which is a polite way of saying the number will go up once you choose what you actually want.
Only compare totals once the scopes and specifications are equivalent. Before that point, the difference in numbers is noise.
Payment schedules
A reasonable payment schedule for a renovation project is staged, tied to milestones, and does not ask for more money than has been earned by the work done. A deposit of ten to twenty percent to cover material ordering and mobilisation is normal. Payments at the completion of defined stages, verified by a site visit if the project is significant, is normal. Payment in full before the work starts is not normal. Payment substantially in advance of the work it covers is a flag.
The total payment schedule should add up to the contract price. If it adds up to more, or if the final payment is very small, understand why before you sign.
Variations: what the contract says matters
Every building project has variations. The scope changes, the client changes their mind, something unforeseen comes up. This is normal. What matters is whether the variation process is defined in the contract.
A good variation clause says that no additional work will be carried out without a written change order, agreed and signed by both parties before the work starts, with a price and any programme impact clearly stated. That protects both sides. The client does not get surprise costs. The builder does not carry out work they cannot invoice for.
A variation clause that allows the builder to carry out additional work at their discretion and invoice for it afterwards is worth questioning before you sign. The protection of knowing the price before the work happens is one of the most important things a contract can give you.
If the quote is a single number
Some builders, particularly smaller ones, quote with a single line and a figure. The work is in the relationship and the conversation, not the document. This can work well if the relationship is solid and the project is small. It is a less comfortable position on a whole-house renovation.
If you receive a single-number quote for a significant project and you want to proceed, ask for the scope in writing before you agree. You are not asking the builder to do more work. You are asking them to write down what they already intend to do. If they are reluctant to do that, it is worth understanding why.
A note on our own quotes
We write our quotes in detail because a clearly scoped project is easier to build than a vaguely scoped one. When both sides know exactly what is included, there is nothing to argue about later. The price you sign is the price you pay. That only holds if the scope is written with enough precision to define what the price covers.
If you receive a quote from us and something is unclear, ask. We would rather answer the question before work starts than have the conversation six weeks into the project.