Most people hire a builder about twice in their life. You will spend more on this than on any purchase except the house itself, and you will choose largely on a handshake and a feeling.
That is not a comfortable position, and the usual advice to get three quotes does not help much. Three quotes from three builders you know nothing about is still three unknowns.
So here is what to actually check before you sign anything, in the order worth checking it. None of it takes long, and most of it can be done before you let anyone through the door.
Here are 8 checks to make when you choose a builder in Stockport:
1. Check the company actually exists
Start with Companies House. It is free, it takes a minute, and it tells you things a website never will.
Look for how long the company has traded, whether accounts have been filed on time, and whether the directors have a trail of dissolved companies behind them. A builder who folds a company every three years and starts a new one is a builder whose guarantees are worth nothing.
Check the trading name matches the legal entity too. If the quote comes from one company name, the website shows another and the bank details are a third, ask why before you go further. There are legitimate reasons, such as a group structure or a recent rebrand, but you want to hear the reason out loud.
2. Understand what the memberships actually mean
Trade logos are not all the same thing, and builders rarely explain the difference.
Which? Trusted Traders
Assessed by Which?, including a check on financial standing and a review of customer references.
Checkatrade
Identity and insurance are verified, and reviews come from customers the trader has invoiced.
TrustATrader
Vetted on insurance and references, with reviews tied to completed jobs.
Federation of Master Builders
Members are inspected and vetted before they are admitted, and have to be re-inspected to stay in. It is the hardest of the common memberships to get into.
(We joined the FMB in 2026).
None of these guarantee a good job. What they do is make it much harder for someone to disappear without consequence, and they give you somewhere to go if things go wrong.
The useful question is not “are you a member?” but “which schemes, and can I see the profile?” A real profile has a work history and reviews attached. A logo in a website footer with no link behind it is just a logo.
3. Ask to see the insurance certificate
Not “are you insured?”, because everyone says yes. Ask for the certificate, and look at two things on it.
Check the certificate is in date and in the name of the company quoting you. Then check the cover level is sensible for the size of your job.
4. Go and look at finished work
Photographs are the easy part. Anyone can have good photographs.
Ask to see a job that finished eighteen months to two years ago, not one that finished last month. New work always looks good. What you want to know is how it has aged: whether the render has cracked, whether the flat roof still holds, whether the new brickwork has weathered into the old or still announces itself from the pavement.
Ask the owner two questions when you get there. Did anything go wrong, and what happened next? Every project of any size has a problem somewhere. A builder worth hiring is one whose customers describe how the problem got fixed rather than how long it took to get a phone call returned.
5. Get it in writing, and stage the payments
A written contract is not a sign of distrust. It is the document both of you point at when memories diverge in month three.
It does not need to be elaborate. It needs to say what is being built, to what specification, for how much, over roughly what period, and what happens if any of those change. If your builder does not offer a contract of their own, the JCT Home Owner range is the recognised standard for small domestic work, and the version for a job you are overseeing yourself (HO/B) is straightforward and written in plain English. You buy it rather than download it free, but it is a small cost against the size of the job.
On payment, the principle is simple: money follows completed work. A staged schedule tied to visible milestones (foundations down, walls up, roof on, first fix, completion) protects you from paying for work that has not happened, and protects the builder from funding your project out of their own pocket.
A deposit to cover materials ordered up front is normal and reasonable. A large deposit before anyone has set foot on site is not.
6. Establish who owns the paperwork
Extensions generate approvals: building control, sometimes planning permission, often a party wall agreement, occasionally a build-over agreement with the water company.
Somebody has to own each of those. Ask directly which ones your builder handles, which ones you are expected to arrange, and what happens to the programme if an approval is late.
The answer matters more than it sounds. The most common reason a job stalls is not the building work. It is waiting on a piece of paper nobody took responsibility for. Get it settled before you start, ideally written into the contract.
Building control sign-off in particular is worth protecting. Without it you will have trouble selling the house, and the problem surfaces years later at the worst possible moment.
7. Test whether they know Stockport
Local knowledge is not a sentimental preference. Stockport’s housing stock throws up a specific set of problems, and a builder who works here every week has met all of them.
Ask how they would approach your type of property. The answers should come quickly:
A builder who has to go away and find out is not necessarily a bad builder. One who has done it twenty times on your street is simply a lower-risk choice.
8. Know the warning signs
None of these means someone is dishonest. All of them mean slow down and ask more questions.
That last one deserves saying plainly. The cheapest quote is sometimes the best value and sometimes a different, smaller job wearing the same description. The way to tell is to read what each quote includes, line by line.
Talk to us
We are builders in Stockport, and we are happy to be checked. We are members of the Federation of Master Builders, Which? Trusted Traders, Trustatrader and Checkatrade, and every one of those profiles is linked from this site.
If you are planning an extension, our home extensions and building services page sets out what we do and how we work. If you are still at the budgeting stage, our 2026 house extension cost guide for Stockport breaks down the real numbers, including the costs most quotes leave out.
When you are ready for a figure of your own, we offer a free, no-obligation site survey across Stockport, covering The Heatons, Hazel Grove, Bramhall, Marple, Cheadle, Wilmslow and the surrounding areas. We will walk the plot with you, tell you honestly what is achievable, and put an itemised written quote in your hands.
Call 0161 359 9199 or book your free site survey today.