Hidden costs in builder’s quotes: 15 things homeowners miss
The items most often left out of a UK builder’s quote, from scaffolding and skip hire to Building Regs fees and making good, and why their absence turns a “cheaper” quote into the dearer one once the work is done.
The cheapest quote on the table is often the one with the most left out. Not because the builder is dishonest, but because every item excluded from the headline price is an item that makes the number look smaller. When you compare a quote that includes scaffolding, skip hire, and making good against one that excludes all three, the second looks cheaper right up until the work is done and the extras arrive.
This is a checklist of the 15 costs most often missing from UK builder quotes. Use it to read what is not on the page, because that is where the surprises live. For how to read the items that are on the page, see how to read a builder’s quote line by line.
Before work starts#
1. Scaffolding. A separate hire cost on roofing, rendering, and any upper-floor work. Hire runs by the week, so delays inflate it. Confirm whether it is included and for how long.
2. Skip hire and waste removal. Skips, tip fees, and permits to place a skip on the road are routinely excluded. On a strip-out-heavy job this is a real number.
3. Temporary works and welfare. Props, temporary electrics, dust protection, and site welfare on bigger jobs. Usually bundled into "preliminaries" on a good quote, and missing entirely on a poor one.
4. Surveys. Structural surveys, drainage surveys, and asbestos surveys on properties built before 2000. A quote that assumes none are needed has made an assumption you should check.
Structural and regulatory#
5. Building Regulations fees. Building Control charges to inspect notifiable work. This is a council fee, not a contractor cost, and is often left to you.
6. Structural calculations. Removing a wall or forming an opening needs a structural engineer’s calculations, commonly a separate fee from a separate professional.
7. Party Wall costs. Work near a shared boundary can trigger the Party Wall Act, which means surveyor fees, often payable per neighbour. Extension and loft quotes frequently exclude this.
8. Planning application fees. Where planning permission is required (rather than permitted development), the application fee and any drawings are usually not in the build quote.
Finishing and reinstatement#
9. Making good. The filling, plastering, and decoration after the main work disturbs walls and floors. The single most common omission, and the one that makes a finished job look unfinished.
10. Plastering. On many quotes plastering is assumed to be a later, separate job. If your room needs skimming after first fix, confirm it is priced.
11. Decoration. Painting after the work is rarely included. "Walls left ready for decoration" means you, or another trade, finish the job.
12. Flooring. Frequently quoted separately, especially on kitchens and extensions. The subfloor may be in the quote; the finished floor often is not.
The catch-all lines#
13. VAT. A 20% line that, if the quote is presented ex-VAT, changes everything. Always confirm the VAT position in writing. See should I hire a VAT-registered builder for what registration tells you.
14. Provisional sums and allowances. Placeholders for items not yet specified (tiles, units, sanitaryware). A low allowance keeps the headline down and the real cost open. A fair quote names each allowance with a figure.
15. Connections and diversions. Moving or connecting drainage, gas, water, or electrics to a new position. On kitchens, bathrooms, and extensions this is real work that a tidy headline price sometimes ignores.
How to use this list#
For the common jobs, the relevant cost guide shows what a complete price normally covers, which makes the gaps easier to spot:
- Kitchen renovation costs
- House extension costs
- Loft conversion costs
- New roof costs
- All UK cost guides
When you compare two quotes, do not compare the totals. Compare what each one includes, add the missing items back to the cheaper quote at a sensible figure, and only then compare. The cheaper headline is regularly the dearer project.
If you would rather not do that by hand, paste or upload your quote into Check the Quote. We check every line against current UK market rates and flag what is missing from the scope, so you can ask for it before you sign rather than discover it after. Your first check is free.
Got a quote you want checked?
Paste any UK contractor quote and Check the Quote compares every line item against current market rates, flags missing scope, and runs a Companies House check on the contractor. Free on your first project.
Frequently asked questions
- What costs are usually left out of a builder’s quote?
- The most commonly excluded items are scaffolding, skip hire and waste disposal, Building Regulations fees, structural calculations, making good (plaster and decoration after the main work), and VAT where the quote is presented before tax. None of these are dishonest to exclude, but a quote that leaves them all out looks cheaper than a quote that includes them, while costing more once they are added back.
- Should a quote include VAT?
- A quote from a VAT-registered builder should state clearly whether the price includes or excludes VAT. If it is silent, assume you need to ask, because a 20% difference on a £20,000 job is £4,000. Builders turning over under the VAT threshold do not charge VAT at all, which is legitimate, but the quote should still make the position explicit.
- Is scaffolding included in a builder’s quote?
- Often not. Scaffolding is a separate hire cost, frequently excluded from roofing, rendering, and upper-floor work quotes. UK scaffold hire commonly runs into the hundreds of pounds per week, so on a job that overruns, it adds up. Always confirm in writing whether scaffolding (and its hire period) is in the price.
- Who pays Building Regulations fees?
- You do, and they are usually not part of the builder’s labour-and-materials quote. Building Control charges a fee for inspecting notifiable work, and some trades self-certify through schemes like FENSA (windows) or an electrician’s Part P registration. Check whether the quote covers the application and certification, or whether that lands on you separately.
- What does “making good” cover and why does it matter?
- “Making good” is the repair and finishing work after the main job: filling, plastering, and redecorating where walls, floors, and ceilings were disturbed. It is one of the most commonly omitted lines, and its absence is why a finished room can look unfinished. If a quote does not mention making good, assume it is excluded and ask for it to be priced.
Last updated: 22 May 2026