A reliable local builder is one you can verify. You can see their finished work, speak to past customers, read an itemised written quote and confirm their insurance before you pay a penny. Whether you are extending in Warrington, converting a garage in Culcheth or opening up a wall in Wigan, the same checks apply. This guide takes you through them in the order you will need them.
TL;DR
- Start with recommendations from people you trust, then check every name yourself rather than relying on the recommendation alone.
- Confirm how long the builder has traded, their permanent address, their insurance and any trade-body membership they claim.
- Get at least three written, itemised quotes based on the same plans, and compare them like for like rather than choosing the cheapest.
- Put the price, scope, timescale and staged payments in a written contract, and agree who deals with building control.
- Be wary of cash-only deals, big upfront payments and anyone who is vague about paperwork.
Table of Contents
- Start with people you can ask
- Check who you are actually hiring
- See the work and speak to past customers
- Get three written quotes and compare them properly
- What your contract should cover
- Planning permission and building regulations
- Warning signs to watch for
- Our perspective on choosing a builder
- Talk to a team that manages the whole project
- FAQ
- Sources
Start with people you can ask
Recommendations from family, friends and neighbours are probably the best starting point, according to one building control partnership. Trusted tradespeople and estate agents can also give you names. The useful part is what you ask the person recommending: was the quality good, did the builder turn up when promised, and how did they deal with problems when they arose? Every project hits a snag somewhere. How the builder handled it tells you more than a glowing “they were great”.
Local knowledge counts too. A builder who works in your area regularly may understand local planning requirements and know the local merchants and trades. In practice, that means someone who already knows how your council tends to handle extensions, and who has worked on the kind of housing around Haydock, Rainhill or Great Sankey.
A good rule is to build a shortlist of three or four names. You will want three quotes anyway, and a slightly longer list protects you if one is booked up for months.
If you want a checklist written for this part of the country, our guide to finding a trusted builder in Greater Manchester covers it in detail, and how to choose a local builder is a good companion read.
Check who you are actually hiring
Before you talk about design or price, establish the basics. Official guidance from building control teams suggests asking:
- How long has the business been operating?
- Does it have a fixed permanent address, not just a mobile number?
- What similar projects has it completed?
- When can it start, and how many jobs is it handling at once?
Another building control partnership adds that you should identify the builder’s legal business identity and contact details, and ask whether they use subcontractors and which competent-person registrations they hold. A limited company or sole trader should be able to tell you plainly who you are contracting with.
Insurance
Ask to see evidence of public-liability insurance, including its expiry date. Trading Standards guidance says you should check that cover remains valid throughout the work and ask about cover for property damage, insolvency or accidents. Citizens Advice also advises checking the trader’s insurance before work begins. A reputable builder will not be offended by the question.
Trade bodies and credentials
The construction industry is largely unregulated, and there is no single recognised qualification a builder must hold. That is why membership of a reputable trade body, and manufacturer approvals for specific products, are worth looking at. Trading Standards advice is to verify any claimed certificate directly with the organisation rather than trusting a logo on a van or website. Any builder confident in their credentials will happily give you the details to do this.
At Complete Property Solutions, for example, we are members of the Guild of Master Craftsmen, an approved HUP! Building System partner, an approved UltraRoof installer and an authorised REHAU installer. We would always encourage you to ask any builder for the same level of detail.
See the work and speak to past customers
Reviews online are a good start, but nothing beats seeing completed work and talking to the people who paid for it. Council guidance is to ask for similar completed work and speak to former customers about quality, timing and the final bill. The Federation of Master Builders suggests asking previous clients about communication, timeliness, budget control, site tidiness and disturbance to neighbours.
Corner wall removed and structural steelwork installed to create an open-plan connection between the existing house and new orangery.
Try these questions with a past customer:
- Did the final bill match the quote, and if it changed, was that explained and agreed first?
- Did the team turn up on the days promised?
- How was the house left at the end of each day?
- Did the neighbours have any complaints, and how were they handled?
- Have any snags appeared since, and did the builder come back to put them right?
Make sure the work you see is comparable. A beautifully finished bathroom does not tell you how a builder handles a wraparound extension, steelwork and a new roof. Ask for projects of the same type and a similar size to yours.
Get three written quotes and compare them properly
Citizens Advice recommends getting written quotes from at least three traders. Each one should state a fixed total price, a breakdown of work and materials, separate costs, how long the quote is valid, VAT, and when the price can change.
The distinction between a quote and an estimate matters. Trading Standards explains that a quote is an exact price that should not rise without your agreement, while an estimate is a rough figure that may change. If someone gives you an estimate, ask whether they can turn it into a fixed-price quote.
Make the comparison fair
Give every builder the same drawings and specification. Where possible, the NHIC recommends using the same detailed plans and specifications and looking beyond price to the quote’s detail, responsiveness, insurance, guarantees, deposit arrangements, references and availability.
A simple way to line them up:
| What to compare | What good looks like |
|---|---|
| Scope | Every element listed: groundworks, steelwork, roofing, glazing, electrics, plastering, finishes |
| Materials | Named products or clear specifications, not “allowance” lines with no detail |
| Price | One fixed total, with VAT stated |
| Timescale | Start date and expected duration in writing |
| Payments | Staged against completed work, not a large lump up front |
| Approvals | Who handles planning and building control is stated |
| Extras | A clear process for agreeing changes in writing |
Local authority advice is to compare quotations like for like rather than automatically choosing the cheapest, because omissions and corner-cutting can make a low quote misleading. If one price is far below the others, look for what has been left out before you get excited.
We have written more on this in why extension quotes vary so much and in our builders quote checklist. If you want another view on weighing up proposals, this guide to rebuilding a home also explains how to read and compare contractor quotations.
What your contract should cover
A quote is a promise to do specified work at an agreed price. Citizens Advice notes that accepting it can create a binding agreement even if it is only spoken, but writing the agreement down helps prove what was agreed.
For larger jobs such as extensions, Trading Standards recommends a written contract with agreed fixed costs or rates, the duration and staged payments tied to defined completed work. Building control guidance adds that a good contract covers materials, labour, hours, dates, responsibilities, waste disposal and VAT.
A sensible contract checklist:
- A full description of the work, with drawings attached
- The fixed price and what is and is not included
- Start date, estimated finish date and working hours
- Staged payments linked to completed stages
- How variations are priced and agreed, in writing
- Who arranges building control inspections
- Waste removal and site tidiness
- Guarantees and what happens if snags appear after completion
One piece of advice is worth following to the letter. Central building control advice is to withhold the final payment until the work is successfully completed and you hold the building control completion certificate. It is a simple way to keep everyone’s incentives aligned.
Planning permission and building regulations
A reliable builder will talk about approvals early, not as an afterthought. Before any work, Citizens Advice says you should check whether the work needs permission or approval. Many single-storey rear extensions fall under permitted development, but not all, and it depends on your property. Our guides to how home extension planning works and permitted development for extensions explain the rules in plain English.
Building regulations are a separate matter from planning. Even where planning permission is not needed, structural work such as removing a wall and fitting an RSJ, or converting a garage, will normally need building control involvement. Our page on what building control does covers inspections and completion certificates.
Two practical points from council advice:
- If you are unsure whether consent is needed, check independently with planning and building control rather than relying only on what a builder tells you.
- Get agreement before altering approved plans, and agree in the contract who arranges the inspections.
Ask each builder how they handle approvals on projects like yours. A confident, specific answer is a very good sign.
Warning signs to watch for
Most of these come down to a lack of transparency:
- Cash or “no VAT” deals. Councils advise avoiding cash or VAT-free arrangements because traders can be hard to trace if something goes wrong.
- Large upfront payments. Agree payment terms before work starts and be cautious about paying a lot in advance. Staged payments tied to finished work are the safer pattern, and building control advice backs payments at defined work stages.
- No fixed address, only a mobile number. A permanent address is one of the basic checks.
- A vague or single-line quote. If you cannot see what is included, you cannot compare it.
- Pressure to sign on the spot. A genuine quote stays valid for a stated period, so you have time to think.
- Credentials you cannot verify. If a trade-body claim cannot be confirmed with the organisation itself, treat it as unproven.
- Reluctance to give references or show finished work.
- Unwillingness to put changes in writing. Variations should be recorded and agreed before the work goes ahead.
None of these checks takes long, and together they filter out most of the stress that gives building work its reputation.
Our perspective on choosing a builder
After more than 35 years of building extensions and renovations across Warrington, St Helens, Wigan and the surrounding towns, we have learned that the best projects start with good questions from the homeowner. We welcome them.
Our view is simple. You should know the price before we start, know who is managing the job, and be able to reach us when you need to. That is why we give fixed-price quotations and manage each project from the first design stage through to completion, so you are not juggling separate trades yourself.
We are a family-run business, and our reputation locally rests on hundreds of positive customer reviews and a portfolio of finished projects you can look at. We are members of the Guild of Master Craftsmen, and we are proud to work with trusted product partners including HUP!, UltraRoof and REHAU.
Our advice is to take your time, get your quotes in writing, and choose the team you feel you can talk to. If that turns out to be us, we will look after your home as if it were our own.
Gareth
Talk to a team that manages the whole project
If you are planning an extension, garage conversion, structural alteration, conservatory roof replacement or full renovation, we would be glad to give you a fixed-price quotation and show you examples of similar work. We cover Warrington, St Helens, Wigan, Rainhill, Great Sankey, Penketh, Culcheth, Croft, Lowton, Golborne, Haydock, Ormskirk, Southport and the surrounding areas.
See our house extensions and garage conversions services, or get in touch to arrange a visit.
FAQ
How many quotes should I get from a builder?
Aim for at least three written quotes. Official consumer advice recommends this so you can judge whether a price is fair. Give each builder the same plans and specification so the figures are comparable.
Is the cheapest quote the best choice?
Not automatically. Councils advise comparing quotes like for like, because a low price can reflect items left out or corners cut. Look at the detail, insurance, guarantees and references alongside the total.
Should I pay a deposit before work starts?
Agree payment terms in writing before work begins and be cautious about large upfront sums. Staged payments linked to completed work are the usual recommendation. Keep the final payment until the work is finished and you have your building control completion certificate.
Do I need a builder with a particular qualification?
There is no single qualification a builder is required to hold, as the industry is largely unregulated. That makes trade-body membership, manufacturer approvals, references and examples of past work more useful. Check any certificate directly with the issuing organisation.
Who is responsible for planning and building control?
This should be agreed in your contract. Check with your local planning and building control teams whether your project needs consent, and agree in writing who arranges the inspections. Ask each builder how they manage this on similar projects.
Sources
- Tips on hiring a builder, Building Control Partnership
- How to find a builder: a practical 13-step guide, Homebuilding
- Choosing a builder, Central Building Control Partnership
- Top tips for employing a builder, Flintshire County Council Trading Standards
- Guide to Choosing a Builder, The NHIC
- The FMB Guide to Finding a Master Builder, Build It
- How to choose a reputable contractor, Westmorland and Furness Council
- Before you get work done on your home, Citizens Advice
- How to select a builder for a home extension, Torfaen County Borough Council
