The short answer
Getting loft conversion quotes starts with a site visit from at least three specialists who will measure your loft, assess the roof structure and provide a written, itemised price. Compare quotes on the same scope, check what is and is not included, and ask each specialist to confirm how they handle building regulations. See how to choose a loft conversion company for the full credentials checklist.
Getting multiple quotes is the single most effective step a homeowner can take before committing to a loft conversion. The price range between the highest and lowest credible quotes for an equivalent project can be £10,000–£20,000, and the difference rarely reflects the quality of the end result — it more often reflects what is and is not included, the company’s overheads and their current workload. Comparing like-for-like quotes on the same scope, from companies who have each visited the property, is what reveals a fair price and a credible contractor.
Getting quotes at a glance
- How many quotes? At least 3 — from companies who visited the site
- What to ask for Written, itemised quote after a measured survey
- Key inclusions Structural engineer, building regs, electrics, fire doors
- VAT Confirm whether the price includes 20% VAT
- Payment terms Milestone-linked, not large upfront sum
- Timeframe Allow 2–4 weeks for quotes after site visits
What happens at the site visit
The quoting process begins with a site visit. A specialist or architect will visit your home, go into the loft and measure the ridge height, assess the roof structure (cut-rafter or trussed), identify the best position for the new staircase and form a view on what type of conversion is feasible for your property. They will discuss with you what you want from the new room, how many rooms you need and whether an en suite is in scope. They may also advise on whether planning permission will be needed and how building regulations will be handled. A thorough site visit takes 45–90 minutes and covers all the key feasibility and design questions — it is not a brief look from the hatch.
What a good quote looks like
A credible written quote should itemise the main cost elements clearly so you can compare it with other quotes. Look for these elements spelled out explicitly:
- Structural engineer’s design and fee (often £500–£1,500)
- Building regulations application and inspection fees
- Main structural work: new joists, steels, roof alterations
- Dormer construction (if applicable): framing, cladding, flat roof, windows
- Staircase supply and fitting
- Insulation to the required standard
- First-fix and second-fix electrics, including mains smoke alarms
- Plasterboard and skimming
- Fire-check doors on the escape route
- VAT at 20% (confirm whether the price is ex-VAT or inclusive)
| Element | Typical cost contribution |
|---|---|
| Structural engineer | £500–£1,500 |
| Building regulations fees | £500–£1,200 |
| Main structural work | £8,000–£18,000 |
| Dormer construction | £5,000–£15,000 (if applicable) |
| Staircase | £2,000–£6,000 |
| Electrics | £2,000–£4,000 |
| Insulation + plasterboard | £3,000–£6,000 |
How to compare quotes meaningfully
Price alone is a poor comparator. The same project can look very different at £35,000 (excluding structural engineer, building regulations and electrics) versus £42,000 fully inclusive. Build a comparison table with each quote’s inclusions set out side by side. For any element missing from a quote, ask the company directly whether it is excluded or included in a line item you cannot identify. If a quote is significantly cheaper than the others, the most likely explanation is that it is not comparing like-for-like — ask for the detail before concluding it is a better value. See how to choose a loft conversion company for what else to check before making a final decision.
After the quotes
Once you have at least three itemised, written quotes from companies who have each visited your property, the decision becomes clearer. Check references for your preferred company, confirm their insurance and registration details, and agree a written contract before paying any deposit. The contract should set out the agreed scope, the payment schedule linked to milestones, start and target completion dates, and the process for handling variations. This page is general information about the quoting process, not professional building, legal or financial advice. Always obtain independent professional advice if you are uncertain about a contractor, a quote or a contract before signing or paying.
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Frequently asked questions
How many quotes should I get for a loft conversion?
At least three. Three quotes from companies who have each visited your property give you enough information to establish a fair price, compare scope and approach, and identify any unusually low or high bids.
How long does it take to get loft conversion quotes?
Allow 2–4 weeks from your first contact with companies to receiving written, itemised quotes. Each company needs to arrange a site visit and then prepare their pricing. Rushing this stage can result in incomplete or unverifiable quotes.
Should the quote include VAT?
Ask explicitly. Most loft conversion work attracts 20% VAT, and some companies quote ex-VAT. Always compare the VAT-inclusive total to ensure you are comparing on the same basis. Confirm the VAT rate that applies to your specific project with the contractor.
Can I negotiate on a loft conversion quote?
It is reasonable to ask companies to explain their pricing and whether there is any flexibility, particularly on timing. Avoid pressuring a company to cut the price without understanding what would be removed from scope — a lower price that removes essential elements creates more risk than it saves money.
Sources & further reading
- RICS — guidance on obtaining quotes for building work and assessing contractor credentials
- Trading Standards / Citizens Advice — consumer rights for building contracts and deposit protection
- LABC (Local Authority Building Control) — building regulations fees and approval process
- Federation of Master Builders — guidance on choosing a building contractor and using written contracts
This is general information about loft conversions in the UK, not professional planning, structural, building or legal advice. Costs are typical illustrations, not quotes; timescales and outcomes vary with your property, location and chosen specialist. Always consult a qualified specialist and your local planning authority before starting work.