Builder Quotes for Refurbishment: What Is Included, What Is Missing and Who Pays for Mistakes?
Three quotes. Same drawings.
Very different promises.
One builder quotes £82,000. Another wants £104,000. The third says £112,000. The natural reaction is to compare the totals, check a few reviews and ask why anyone would pay £30,000 more.
Pause there.
A refurbishment quote is not just a price. It is a bundle of assumptions about what will be built, what might be discovered, who will make decisions and who carries the risk when something goes wrong.
The cheapest quote can be the best one. It can also be the most expensive route to a finished home.
The difference sits underneath the number.
Start with one question: is it a quote or an estimate?
People use the words interchangeably. The law and the paperwork may not.
A genuine fixed-price quote is normally an offer to complete a defined scope for an agreed price. An estimate is a reasoned prediction of what the work may cost. It can move as the assumptions change.
That does not mean every document headed “quotation” is fixed, or every document headed “estimate” gives the builder unlimited freedom. Courts look at the agreement as a whole: the scope, price wording, assumptions, exclusions, later emails and what both parties understood.
The label matters.
The mechanism matters more.
Price wording | What it usually means | The question to ask before signing |
|---|---|---|
Fixed lump-sum quote | An agreed price for a clearly defined package | Which clauses, allowances or events can change the total? |
Estimate | A forecast based on stated assumptions | What is the likely range, and when will it become fixed? |
Prime-cost allowance | A budget for an item not finally selected, such as tiles or sanitaryware | Does the allowance cover supply only, or delivery, fitting, waste and the builder’s margin too? |
Provisional sum | A temporary allowance for work that cannot yet be properly defined | What investigation would allow this work to be designed and priced now? |
Daywork or schedule of rates | Actual time, materials or measured quantities charged at agreed rates | Who signs the daily records, and is there a spending cap? |
Under the Consumer Rights Act 2015, a trader providing a service to a consumer must use reasonable care and skill. Important statements made about the service can also become part of the contract if the consumer relied on them. If no price or pricing method was agreed, the law may imply a reasonable price.
That is a safety net.
It is not a pricing strategy.
Compare the same finished job
Suppose Maya is refurbishing and extending her home. All three builders received the same drawings, but their prices look like this:
Cost component | Builder A | Builder B | Builder C |
|---|---|---|---|
Headline price | £82,000 excluding VAT | £104,000 including VAT | £112,000 including VAT |
Price after VAT comparison | £98,400 | £104,000 | £112,000 |
Kitchen | Excluded; Maya budgets £12,000 | Included | Included to named specification |
Flooring | Excluded; Maya budgets £4,000 | £25/m² supply allowance | Included to named specification |
Waste, building control and certificates | Excluded; estimated £3,000 | Included | Included |
Structural opening-up risk | Not mentioned | £8,000 provisional sum | Remedial scope fixed after an intrusive survey |
Builder A is not really £82,000. On Maya’s known figures, it is already £117,400 before structural surprises, extra coordination or any overspend on finishes.
Builder B has a lower headline price than Builder C, but part of it is still uncertain. The £8,000 provisional sum may go up. Its flooring allowance may buy a very different product.
Builder C may still be expensive. But it has converted more unknowns into a defined specification.
That has value.
Do not ask, “Which quote is cheapest?”
Ask, “What would each route cost for the same finished result?”
What should a useful refurbishment quote include?
A one-page total is rarely enough for a substantial project. Ask each builder to price the same dated drawing set and specification, then make the inclusions visible.
Your comparison should cover:
demolition, temporary support and protection of the existing home;
scaffolding, access equipment and site security;
structural steel, padstones, foundations and structural engineer requirements;
roof, windows, external doors, insulation and weatherproofing;
drainage, plumbing, heating, ventilation and electrics;
kitchen, bathrooms, flooring, joinery, plastering and decoration;
appliance connections, testing and final certificates;
skips, waste removal, cleaning and making good;
design work, building control, planning conditions and Party Wall matters;
contractor overhead, profit and project management;
VAT; and
the defects process, guarantees and handover documents.
Now read the exclusions.
Slowly.
“By client”, “by others”, “subject to survey”, “to be confirmed” and “provisional” are not background wording. They identify work, cost or risk that may sit outside the headline price.
Who pays when the figures are wrong?
There is no honest one-line answer. Start with four questions:
What result did the contractor promise?
How was that work priced?
Who supplied or controlled the relevant information?
Was there an agreed change?
The following starting positions are useful, but the actual contract decides the outcome.
What happened? | Usual starting position | What could change it? |
|---|---|---|
The main contractor made an arithmetic mistake in an accepted fixed quote | Usually the contractor’s pricing risk | The mistake was obvious, the quote had not been accepted, or the contract allows correction |
The electrician forgot to price part of the agreed electrical scope | Usually a problem between the main contractor and electrician | The homeowner appointed the electrician directly, or the item was clearly excluded or provisional |
Materials became more expensive | Usually the contractor’s risk under a fixed price | A fluctuation clause, expired quotation or compensable client delay |
The homeowner asks for extra sockets or a different kitchen | Usually a client-funded variation | The original specification already included the item |
The builder omitted something necessary to complete its promised package | Often the builder’s risk | The scope, drawings or design allocation place it elsewhere |
Rot, asbestos or inadequate foundations appear after opening up | The contract’s unforeseen-condition wording matters | Surveys, warnings, discoverability and the defined original scope |
The architect supplied a late or incorrect drawing | Potential client time-and-cost exposure | The contractor’s checking and warning duties, causation and contract wording |
Defective subcontract work must be redone | The main contractor ordinarily remains responsible to the homeowner for the contracted result | A separate direct appointment, valid limitation or unusual nomination arrangement |
What about an obvious pricing mistake?
An accepted fixed quote is not automatically reopened because the builder regrets it. But the law does not encourage someone to knowingly exploit an obvious error.
In Hartog v Colin & Shields [1939], a buyer realised that goods had mistakenly been offered by the pound rather than by the piece and tried to accept the bargain. The court found no binding agreement on that mistaken basis because the buyer knew of the error.
For a refurbishment, imagine a fully itemised £96,000 tender whose total box accidentally says £9,600. That is very different from a builder later discovering that its plasterer underestimated the labour.
One is obvious.
The other may be commercial risk.
If subcontractors are involved, draw the contract map
The person wearing a tool belt in your kitchen is not necessarily the person you contracted with.
There are three common arrangements.
One main contractor
You contract with the main contractor. It appoints and pays the plumber, electrician, roofer and other trades. The main contractor ordinarily remains responsible for coordinating and delivering the agreed package.
If its electrician underquoted, that does not automatically create a new contract between you and the electrician.
Several direct trades
You contract separately with the builder, electrician, kitchen installer and perhaps the plumber. You may save the main contractor’s management margin, but you assume more interface risk.
Who measures the kitchen? Who makes good after the electrician? Who pays when one trade delays another?
Write it down.
A client-appointed specialist
You employ a specialist who must work alongside the main contractor. The documents should say who provides design information, access, scaffolding, power, protection, coordination and making good.
This is where gaps thrive.
Do not casually pay a subcontractor because they threaten to leave. First establish whether the payment is an advance to the main contractor, a deduction from the next stage payment, a new direct appointment or a payment made while reserving your position.
Otherwise, you may pay twice.
Safety roles do not decide the price dispute
On a domestic project with several contractors, the Construction (Design and Management) Regulations 2015 normally place the domestic client’s project-management duties on the principal contractor during construction. A principal designer manages the design-stage duties.
Those roles matter enormously for safety.
They do not automatically decide who pays for an omitted tap, an underpriced cable run or a structural variation. Contractual responsibility and CDM responsibility are different maps.
Control variations before the work starts
Most refurbishment disputes are not caused by one dramatic event. They grow through ten small conversations.
“While you are here…”
“We had to do it.”
“I thought that was included.”
Use a simple written variation record. It should state:
the change and why it is needed;
the drawing or specification affected;
the fixed price, or the agreed way it will be calculated;
VAT;
any effect on the programme and completion date;
who approved it and when; and
photographs or supporting evidence where relevant.
No price yet? Agree a cap or an authorised investigation stage. Do not approve “whatever it costs” because a wall has already been opened.
Emergency work can be different. If immediate action is needed to keep the property safe or watertight, record the condition, instruction, labour and materials as soon as possible.
Are you legally a consumer?
This point is easy to miss.
The Consumer Rights Act protects an individual acting wholly or mainly outside their trade, business, craft or profession. Someone refurbishing the family home is the straightforward example.
A landlord, developer or repeat investor may be acting for business purposes. Mixed-purpose projects can be fact-sensitive. Do not assume consumer protections apply merely because the contract is in a person’s own name.
The distinction can affect implied rights, unfair terms and dispute options.
Did you sign at home or online?
Many building contracts are agreed in the kitchen, by email or after a phone call. The Consumer Contracts Regulations 2013 may require detailed pre-contract information and, for many distance or off-premises service contracts, a 14-day cancellation period.
There are exceptions and qualifications. Urgent repairs have special rules. Construction of a completely new building is treated differently, but an extension or refurbishment is not automatically a new building.
If a builder wants to begin during the cancellation period, the paperwork should deal properly with your express request and the cost consequences of cancellation.
If an extra is disputed, build the evidence in this order
Keep one project folder. Put the accepted quote, contract, drawings, specifications, emails, photographs, programme, invoices, certificates and variations in it.
Then, for each disputed extra:
quote the original scope wording;
identify the relevant drawing revision;
ask which contract clause permits the additional charge;
separate genuinely new work from correction of defective or incomplete work;
request the cost build-up, VAT and time effect; and
pay undisputed amounts while recording why the remainder is disputed.
Do not begin with accusations.
Begin with the documents.
The dispute route may include negotiation, mediation, a contractual adjudication process or court. One technical trap is that the statutory construction adjudication right generally does not apply to a contract with a residential occupier for work on a home they occupy or intend to occupy. Some homeowner contracts create their own adjudication procedure instead.
The practical decision
A low quote is not suspicious merely because it is low. The builder may have better buying terms, lower overheads or a more efficient programme.
Make them show it.
Normalise VAT. Price the exclusions. Test the allowances. Identify who holds every contract. Agree how variations work. Tie stage payments to visible progress, not hopeful dates.
Then compare.
Not before.
How Unwildered can help
You can use Unwildered to review a quotation, building contract, schedule of works or variation email in plain English. It can help separate fixed scope, exclusions, allowances and change clauses, then organise the questions you may want to put to the contractor.
It cannot inspect the site, value specialist work or decide a disputed factual issue. For structural concerns, significant sums or a project already in conflict, a surveyor, architect, solicitor or other appropriate professional may be needed.
FAQ: the questions people feel silly asking
Can I just choose the cheapest quote?
You can. But first add VAT, known exclusions and realistic allowance increases. If it is still cheapest for the same finished job, the low price may be genuine.
The builder now says the quote was “only an estimate”. Is that enough?
No. A new label does not rewrite an accepted agreement. Check the document, scope, assumptions, price-adjustment wording and messages exchanged before acceptance.
Do I have to pay because the electrician underquoted?
Usually not where the electrician is the main contractor’s subcontractor and the missing item was already in the fixed scope. The answer can change if you appointed the electrician directly, changed the work or accepted an allowance rather than a fixed price.
This article provides general information for England and Wales. It is not legal, surveying, architectural, tax or financial advice.
