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Planning
Is Planning Permission Necessary? How to Make a Planning Application Once your Planning Application is Received Decision Outcomes Appealing a Decision What Happens NextBuilding Regulations
Prepare to Build Building Control Conservation Areas Tree Preservation Orders (TPOs) Listed Buildings The Party Wall etc. Act 1996 Basement Development Advice HETAS NICEIC Gas Safe Construction Management Waste Management Interior DecorationHiring the wrong contractor is the single biggest cause of home-improvement disasters. These are the exact questions to ask, documents to request, and red flags to spot before any money changes hands.
Always collect at least three written quotes, verify public liability insurance of no less than £2 million, and check independent reviews before hiring any tradesperson. A reputable contractor will answer every question below without hesitation — one who stalls or rushes you is a red flag in itself.
Roughly 1 in 3 UK homeowners who used an unvetted tradesperson reported shoddy workmanship, according to Which? research — and recovering costs through the courts averages 12–18 months. Spending 30 minutes asking the right questions upfront can save thousands of pounds and months of stress.
Three written, itemised quotes received (not verbal estimates)
Public liability insurance confirmed at £2 million minimum — certificate seen, not just described
Employer's liability insurance confirmed if contractor brings a team
Trade scheme membership verified online (e.g. NICEIC/NAPIT for electricians, Gas Safe for gas work, CIPHE/WaterSafe for plumbers)
At least 3 independent reviews read on Checkatrade, Trustpilot, or Google — not just testimonials on their own website
Physical address confirmed (not just a mobile number and a van)
Start date AND estimated completion date agreed in writing
Payment schedule agreed in writing — never pay 100% upfront
Written contract or detailed quote signed by both parties before work begins
Materials specification listed — brand, grade, and quantity stated
Site tidying and waste-removal responsibility confirmed
Guarantee or warranty terms provided in writing
Good answer: They produce a public liability certificate showing ≥£2 million cover with a current expiry date. Red flag: 'Yes, of course' with no document offered.
Good answer: They give you a scheme registration number you can verify online in under 60 seconds. Red flag: Vague membership claims or a lapsed badge.
Good answer: They hand over two or three contacts without hesitation. Red flag: 'I'd have to check' or references who are suspiciously hard to reach.
Good answer: A document listing labour, materials (by brand/grade), day-rate or fixed price, VAT status, and any exclusions. Red flag: A single round-number figure via WhatsApp.
Good answer: A staged payment plan — typically 25% on start, milestones in the middle, 10–15% retained on satisfactory completion. Red flag: Full payment or a large deposit (>33%) demanded upfront.
Good answer: Clear explanation of who is on site each day and confirmation that any subcontractors are also insured. Red flag: Evasive or constantly changing answer.
Good answer: Specific dates with a written programme. Good trades are often booked 4–8 weeks out; anyone available tomorrow for a big job warrants scrutiny.
Good answer: Named products and standards (e.g. BS EN 197-1 cement, A-rated glazing units). Red flag: 'Good stuff' or 'trade quality' with nothing written down.
Good answer: Yes — ideally a JCT Minor Works or similar standard form, or at minimum a detailed written quote signed by both parties. Red flag: 'We don't need anything formal, you can trust me.'
Good answer: A minimum 1-year workmanship guarantee in writing, separate from product warranties. Red flag: 'Everything will be fine, no need for guarantees.'
Good answer: Description of dust sheets, temporary protection, and site security at end of day. Red flag: Dismissiveness or 'it's only a bit of dust.'
Good answer: Clear statement of who skips, when it goes, and whether the skip cost is in the price. Red flag: Silence on this point — fly-tipping costs fall to the homeowner.
Good answer: Yes or no — both are valid for small traders. If they claim to be VAT registered, ask for their VAT number and verify it at gov.uk/check-vat-number. Red flag: A quote with 'VAT included' and no VAT number shown.
Good answer: A clear variation process — written change order with cost agreed before extra work begins. Red flag: 'We'll cross that bridge when we come to it.'
Good answer: Membership of a trade association with independent arbitration (e.g. FMB, NICEIC, Gas Safe) or willingness to use a small-claims mediation service. Red flag: Hostility at the question.
| Trade | Key Scheme(s) to Check | Where to Verify | Why It Matters |
|---|---|---|---|
| Electrician | NICEIC, NAPIT, SELECT (Scotland) | niceic.com, napit.org.uk | Competent-person self-certification; must be current |
| Gas engineer | Gas Safe Register | gassaferegister.co.uk | Legal requirement to work on gas appliances |
| Plumber | WaterSafe, CIPHE | watersafe.org.uk | Approved contractor status for water regulations |
| Builder / general contractor | FMB (Federation of Master Builders) | fmb.org.uk | Vetted, insured, and subject to independent inspection |
| Roofer | NFRC (Nat. Federation of Roofing Contractors) | nfrc.co.uk | Standard BS 8217 flat roofs / BS 5534 pitched roofs |
| Heating engineer | OFTEC (oil), Gas Safe (gas), MCS (renewables) | oftec.org, mcscertified.com | Required for boiler/heat-pump certification |
| Dryliner / plasterer | No single body — check FMB or TrustMark | trustmark.org.uk | TrustMark is a government-endorsed quality scheme |
Quotes are only comparable when they specify the same scope, materials, and inclusions. Use this framework to strip out noise and compare like for like.
| Line item to compare | Quote A | Quote B | Quote C |
|---|---|---|---|
| Total price (inc. VAT) | £ ___ | £ ___ | £ ___ |
| Labour broken out separately? | Y/N | Y/N | Y/N |
| Materials brand/grade specified? | Y/N | Y/N | Y/N |
| Waste removal included? | Y/N | Y/N | Y/N |
| Start date confirmed in writing? | Y/N | Y/N | Y/N |
| Completion date confirmed? | Y/N | Y/N | Y/N |
| Written workmanship guarantee? | Y/N | Y/N | Y/N |
| Payment schedule staged? | Y/N | Y/N | Y/N |
| Insurance certificate provided? | Y/N | Y/N | Y/N |
| Trade scheme membership verified? | Y/N | Y/N | Y/N |
A contractor who welcomes every question on this list is the contractor worth hiring. Confidence and transparency go hand in hand.
| Trade | Typical Day Rate (London) | Typical Day Rate (Rest of UK) | Notes |
|---|---|---|---|
| General builder | £300–£450 | £200–£350 | Higher for groundwork specialists |
| Electrician | £350–£500 | £250–£400 | NICEIC/NAPIT registered |
| Gas Safe engineer | £300–£450 | £250–£380 | Per engineer, not including parts |
| Plumber | £300–£450 | £200–£350 | Emergency call-out can double this |
| Plasterer | £250–£380 | £180–£300 | Per room rates often more relevant |
| Roofer | £250–£400 | £180–£300 | Plus scaffold and materials |
| Carpenter/joiner | £250–£380 | £180–£300 | Bespoke joinery at the higher end |
| Painter & decorator | £200–£320 | £150–£250 | Labour only, materials extra |
Get at least three written, itemised quotes before committing to any tradesperson. This gives you a market-rate benchmark — quotes 30–40% below the others usually signal cut corners or a price that will inflate through 'extras' once work begins.
Any tradesperson working in your home should carry public liability insurance of at least £2 million — ask to see the actual certificate, not just a verbal confirmation. If they bring employees or subcontractors, employer's liability insurance (minimum £5 million) is also required by law.
A reasonable deposit for materials on a large job is typically 10–25% of the total contract value. Never pay more than 33% upfront, and never pay the full amount before work is completed. A final retention of 10–15% held until satisfactory completion protects you.
Verify their trade-scheme registration number online in under 60 seconds: NICEIC or NAPIT for electricians, Gas Safe for gas engineers, WaterSafe for plumbers, FMB for builders. Also check their VAT number at gov.uk/check-vat-number if they charge VAT, and read independent reviews on Checkatrade, Trustpilot, or Google — not just their own website.
A reliable quote must itemise labour and materials separately, name specific materials by brand and grade, state whether VAT is included, list start and completion dates, cover waste removal, and detail the payment schedule. A single round-number figure with no breakdown is not a quote — it is a guess.
Key red flags include: knocking unsolicited and pressuring you for a same-day decision, no fixed address, inability to produce an insurance certificate, demanding more than 33% deposit upfront, offering a large 'cash discount', and reviews that are absent or clustered in a suspicious short window.
UK day rates in 2024–25 typically range from £180–£300 outside London and £250–£500 in London, varying by trade: electricians and gas engineers sit at the higher end (£250–£500), painters and decorators at the lower end (£150–£320). Always compare against a fixed-price quote once scope is clear.