What's Included in a Builder's Quote? Homeowner Checklist

What a Good Quote Should Actually Show

A proper builder quote checklist is not about making the cheapest price look expensive. It is about making sure you understand what you are being asked to approve.

Most homeowner problems start here. The quote looks tidy, the total looks manageable, and everyone wants to keep things moving. Then the awkward bits appear later: missing groundwork, vague drainage assumptions, soft kitchen allowances, unclear steel costs, or a finish specification that turns out to be much lower than expected.

Use this builder quote checklist before you pay a deposit, approve a revision, or tell yourself the paperwork is "probably fine".

Core Build Items That Should Be Clearly Stated

A useful builder quote checklist starts with the obvious construction items. If these are unclear, the rest of the quote is usually worse.

You should be able to identify, in writing:

• demolition or strip-out work
• site setup and welfare
• skip hire and waste removal
• scaffolding
• foundations and groundworks
• drainage work and connections
• brickwork or blockwork
• roof structure and covering
• windows, doors and glazing
• insulation to current standards
• plastering and second-fix works
• electrics and plumbing
• decorating, if included
• making good disturbed areas

If several of those are missing, bundled into one vague line, or described too loosely, your builder quote checklist should treat that as a warning, not a small admin issue.

Foundations, Drainage and Structural Costs

This is the part of the builder quote checklist that catches some of the nastiest surprises.

A quote does not need to predict every ground condition perfectly, but it should tell you what has been assumed.

Check whether the quote explains:

• what kind of foundations are assumed
• whether excavation depth is fixed or estimated
• what happens if ground conditions are worse than expected
• whether drainage runs are assumed to stay simple
• whether manhole moves or reroutes are included
• whether structural steel design and supply are fixed or provisional

If the quote is silent here, read [Why Your Extension Quote Doesn't Include Foundations](/blog/extension-quote-foundations-missing). It is one of the most common gaps we see when using a builder quote checklist properly.

Openings, Steel, Glazing and Fabric

When you use a builder quote checklist, do not stop at the shell. Big-ticket items inside the shell often create the later argument.

Make sure the quote is clear on:

• how many steel beams or lintels are included
• whether engineer changes are treated as extras
• glazing type, brand or performance level
• bi-fold or sliding door specification
• rooflight size and brand
• insulation standard and product level
• whether acoustic or upgraded thermal spec has been assumed

A strong builder quote checklist looks for specifics. "Windows included" is weak. "Two aluminium sliding doors, anthracite, supply and install" is much stronger.

Kitchens, Bathrooms, Flooring and Decoration

A homeowner often thinks these items are covered because the builder has priced "the extension". A proper builder quote checklist stops that assumption.

Check whether the quote states:

• kitchen units included or excluded
• appliance supply included or excluded
• bathroom sanitaryware included or excluded
• tile allowance or exact tile spec
• timber, vinyl or carpet flooring included or excluded
• decorating standard and number of coats
• skirting, architraves and ironmongery level

This part of the builder quote checklist matters because these items can shift the real total by thousands very quickly.

Fees, Third Parties and Admin Costs

A lot of hidden extras are not actually hidden. They are simply outside the builder's own scope. Your builder quote checklist should still surface them before you commit.

Look for clarity on:

• architect or technician fees
• structural engineer fees
• planning application fee
• building control fees
• party wall surveyor costs
• Thames Water or other utility approvals if relevant
• warranty costs, if any
• skip permits or parking suspensions if needed

If your builder quote checklist reveals that these are all sitting outside the builder's number, that does not automatically make the quote bad. It just means the real project cost is higher than the front-page total suggests.

Provisional Sums, Prime Cost Items and Allowances

This is one of the most important parts of any builder quote checklist.

A provisional sum is not evil. An allowance is not automatically dishonest. But both create movement in the price, and you need to know where that movement can happen.

Check:

• which items are provisional
• which items are fixed
• what allowance figure has been used
• whether that allowance is realistic for your standard
• what happens if the real supply cost is higher
• whether labour stays fixed when the item changes

A practical builder quote checklist treats allowances as risk zones. The more vague allowances you see, the less confidence you should have in the final total.

What Is Often Excluded

If you only remember one section of this builder quote checklist, make it this one.

Common exclusions include:

• kitchen supply
• appliances
• specialist lighting
• flooring finishes
• decorating upgrades
• landscaping and patio reinstatement
• external drainage complications
• party wall work
• upgraded glazing
• utility upgrades
• building control reinspection charges

The safest question in your builder quote checklist is still: "What is not included in this figure?"

Questions to Ask Before You Pay a Deposit

Use this builder quote checklist to send short written questions back before money moves:

1. What exactly is included in the current total? 2. Which items are provisional or allowance-based? 3. What assumptions have been made on foundations and drainage? 4. What is excluded completely? 5. Is steel design and supply fully covered? 6. Is glazing specified properly? 7. Are kitchen, flooring and decorating costs included? 8. Are building control and other third-party fees included? 9. How are variations priced? 10. What would most likely increase this figure after we start?

If you are right at that commitment point, also read [Check Builder Quote Before Paying Deposit](/blog/check-builder-quote-before-paying-deposit). It sits naturally alongside this builder quote checklist.

Quick Example of How the Real Cost Moves

Headline quote: £68,000

Then the missing or soft items show up:

• deeper foundations: +£5,500
• drainage reroute: +£2,400
• steel revision: +£1,800
• kitchen not included: +£11,000
• flooring not included: +£3,200
• party wall surveyor: +£1,500

Real working total: £93,400

That is exactly why a builder quote checklist matters. The original number may not have been fake. It may simply have been incomplete.

When to Get a Second Opinion

A builder quote checklist is a filter, not a substitute for review.

If the quote still feels vague after this check, the next sensible step is a human second opinion.

• Start with [Quick Review](/quick-review) if you want a fast first check.
• Use [Builder Quote Review](/builder-quote-review) if you already have the paperwork in hand.
• See the [Sample Report](/sample-report) if you want proof before you buy.

Frequently Asked Questions

Does every builder quote need this level of detail?

Not every small job needs a huge specification, but any serious extension quote should stand up to a builder quote checklist without falling apart.

Does a higher quote always mean a better quote?

No. Sometimes the higher figure is simply more complete. Sometimes it is just more expensive. A builder quote checklist helps you tell the difference.

Is this only about catching dishonest builders?

No. Plenty of quote problems come from assumptions, omissions, and rushed paperwork rather than fraud. A builder quote checklist protects you either way.

What is the safest next step if I am unsure?

Do not rush the deposit. Get the unclear parts clarified in writing or get an independent second opinion before you sign anything.

Final Word

The best builder quote checklist does one thing well: it turns a vague price into a clearer decision.

If the quote cannot answer basic checklist questions now, it usually becomes more expensive, not less, once work begins.