How to Vet a UK Contractor: Complete Checklist for 2025
15 Point Verification Process Before You Hire
Your Vetting Progress
0/15 checksComplete all 15 checks before making a hiring decision.
A bad contractor can turn a £15,000 kitchen renovation into a £25,000 nightmare. Unfinished work, poor craftsmanship, and contractors who vanish mid project cost UK homeowners an estimated £1.4 billion annually.
The good news? Most of these disasters are preventable with proper vetting. This systematic 15 point checklist helps you find the right professional for your project, whether you are hiring for a bathroom refit, full house renovation, or energy retrofit.
The Cost of Not Vetting
Citizens Advice reports home improvement complaints consistently rank in their top 10 consumer issues. The most common problems:
- 38% Work not completed to acceptable standard
- 22% Contractor abandoned project mid way
- 19% Final cost significantly exceeded quote
- 15% Work took much longer than promised
- 6% Contractor disappeared after taking deposit
Average loss when proper vetting is skipped: £5,000 to £10,000. Some homeowners lose £50,000+ on major projects.
Section 1: Basic Credentials
Points 1 to 5 of your vetting checklist
Every legitimate contractor should be a registered business. Check Companies House for limited companies, or ask for their UTR number for sole traders.
Search company name on Companies House. Verify company status is 'Active', directors match who you are dealing with, and note how long they have been trading.
Companies House (free search at find-and-update.company-information.service.gov.uk)
Company is dissolved, dormant, or does not exist. Directors do not match. Very recently incorporated with no track record.
A legitimate contractor has a fixed business address, not just a mobile number. This matters because you need to find them if something goes wrong.
Check address matches Companies House registration. Use Google Street View to verify it is a real premises rather than a virtual office or PO Box.
Only provides mobile number. Address is a virtual office or residential property. Address does not match official registration.
Trade body membership signals commitment to standards. Members agree to codes of practice and often carry additional guarantees.
Search the relevant trade body website with the contractor's name or registration number. Call to confirm membership is current.
FMB for builders, NICEIC/NAPIT/ELECSA for electricians, Gas Safe for gas engineers, TrustMark for retrofit
Claims membership but not listed on trade body website. Membership lapsed or under investigation.
Public liability insurance covers damage to your property or injury to third parties. Minimum cover should be £2 million for domestic work.
Request certificate of insurance. Call the insurer directly to verify policy is current and covers the type of work you need.
Cannot produce certificate. Policy expired. Cover amount too low. Policy excludes the work type you need.
Required by law if they have employees. Covers workers injured on your property. Without it, you could be held liable.
Request certificate showing minimum £5 million cover. Verify policy is current and covers all workers on site.
Claims to work alone but brings helpers. Cannot produce certificate. Policy does not cover subcontractors they use.
Section 2: Track Record
Points 6 to 10 of your vetting checklist
Ask for at least three references from similar projects completed in the last 12 months. Quality contractors have satisfied customers willing to vouch for them.
Actually call references. Ask about timeline, budget accuracy, quality of work, communication, and whether they would hire again.
Cannot provide references. References are vague or cannot recall details. All references are family or friends.
Ask to see photos of completed projects similar to yours. Look for before and after images showing the transformation.
Request photos with dates. Ask to visit a recent completed project if possible. Check their website and social media.
No photos available. Stock images on website. Cannot show projects similar to yours.
Look at Google reviews, Checkatrade, Rated People, TrustATrader, and Facebook. Multiple sources give a fuller picture.
Read reviews from multiple platforms. Look for patterns in complaints. Note how they respond to negative reviews.
No online presence. Only 5 star reviews (may be fake). Defensive or aggressive responses to criticism. Pattern of similar complaints.
Longer established businesses generally carry lower risk. Check how long they have been operating under current name.
Companies House shows incorporation date. Ask directly how long they have been in the trade (may be longer than current company).
Brand new company with no track record. Multiple company names over short period. Previous companies dissolved.
Verify they have specific experience with your type of project. A bathroom specialist may not be ideal for structural work.
Ask how many similar projects they have completed. Request specific examples and references for your project type.
Generalist claiming expertise in everything. Cannot demonstrate relevant experience. First time doing your type of work.
Section 3: Quote Quality
Points 11 to 15 of your vetting checklist
Quote should detail exactly what is included, what is excluded, materials to be used, and timeline. Vague quotes lead to disputes.
Read every line. Ask about anything not explicitly mentioned. Clarify whether VAT is included. Understand payment terms.
Verbal quote only. Vague descriptions like 'bathroom as discussed'. No timeline. Excludes key items.
Payments should be tied to completed milestones, not calendar dates. Never pay more than 20% deposit.
Payment schedule should show: 10% to 20% deposit, stage payments at completion of major phases, 10% retention until snagging complete.
Wants 50%+ upfront. Payments not linked to work stages. Cash only. Reluctant to put payment terms in writing.
Always get at least three quotes for comparison. This establishes market rate and reveals outliers.
Ensure quotes are for identical scope. Compare line by line. Ask contractors to explain significant differences.
Quote dramatically lower than others (corners will be cut). Quote dramatically higher without justification. Reluctant to provide detailed breakdown.
A written contract protects both parties. It should cover scope, timeline, payment, variations, and dispute resolution.
Review contract carefully before signing. Ensure it matches the quote. Check cancellation terms and warranty provisions.
No written contract. One sided terms. No provisions for variations or disputes. Pressure to sign immediately.
Understand what warranties apply to workmanship and materials. Check if covered by insurance backed guarantee schemes.
Get warranty terms in writing. Check duration and what is covered. Verify if registered with deposit protection or guarantee scheme.
No warranty offered. Verbal promises only. Warranty shorter than industry standard. No comeback if company fails.
Trade Body Reference Guide
Different trades have different relevant accreditation bodies. Use this guide to verify credentials for specific work types.
| Trade | Key Accreditations | What It Means |
|---|---|---|
| General Builder | FMB (Federation of Master Builders) | Vetted, insured, code of practice |
| Electrician | NICEIC, NAPIT, ELECSA | Competent Person Scheme: can self certify |
| Gas Engineer | Gas Safe Register | Legally required for any gas work |
| Plumber | CIPHE, WaterSafe | Trained to regulations, often not mandatory |
| Roofer | NFRC, Competent Roofer | Insurance backed guarantees available |
| Retrofit/Insulation | TrustMark, PAS 2030 | Required for government grant funding |
Key Takeaways
Know What to Pay Before You Get Quotes
Use our free calculator to understand fair pricing so you can identify overpriced or suspiciously cheap quotes.
Use Cost CalculatorRelated Guides
Contractor Red Flags
15 warning signs that signal trouble before you hire.
How to Read a Contractor Quote
Understand what should be included and spot missing items.
Kitchen Renovation Costs UK
Understand fair pricing before getting quotes.
How to Budget for Renovation
The 50/30/20 framework for realistic budgets.
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