How to Find a Good Builder — and Spot a Cowboy Before They Spot You

This article is adapted from Chapter 3 of Your Seven Step Home Extension Plan by Ashton Paul — the book that shows homeowners how to manage a project and avoid the stresses and strains of the home extension process.

Here's the honest truth from decades around building sites: other than the small minority who are solely there to rip you off, most builders are quite good. The real skill isn't finding a good builder — it's understanding what kind of builder you're talking to, and running the checks that fraudsters can't fake.

Know what you're looking at: the size ladder

Building firms come in tiers, and the right tier for a domestic extension or loft conversion matters more than most homeowners realise:

• Tradesmen — joiners, plumbers, electricians, decorators working for themselves.
• Small builders — the natural fit for domestic extension and conversion work. A core team of essential trades supported by subcontractors, typically focused on weekly wages and a steady flow of one to one-and-a-half projects at a time.
• Contractors — a management layer, an office, and overheads-and-profit thinking with a gross margin of 15–25% built in. You wouldn't use a food blender to make an omelette, and you wouldn't use a building contractor for a home extension — it will cost you at least 15% more, for processes you don't need.

The two builders inside every project

Every project actually needs two different characters. The starter is the big construction man: strip-out, demolition, groundworks, making the structure work in accordance with the drawings. The finisher is a more refined individual — often a joiner by trade — who forms the roof, hangs doors, fits architraves, skirtings and kitchens. It's unusual for one person to have the aptitude for both, so a good small builder is really a well-balanced team.

There's a generational difference worth knowing too. The young builder brings energy and modern methods, but is more likely to overstretch — taking on two or three projects at once, and it's the smaller project (yours) that suffers when the pressure tells. The older builder has learned those lessons: more conservative, more patient — he'd rather wait three days for a plumber he trusts than take the fourth-choice one who's available — and usually reliable, if slower. Neither is better; they suit different projects and different clients.

Spotting the cowboy

It would be so much easier if bad builders wore spurs and large cowboy hats. They don't. They look and talk like any other builder, with a few tells:

1. Money up front. The quickest con there is. Once they hold your money, you're over a barrel — less likely to push about problems for fear the work stops entirely.
2. Cash terms only. Cash talk exists to avoid contracts and make payments hard to trace.
3. Reassurance instead of specifics. Cowboys are full of promises and are usually very nice characters — they rely on you trusting them, because they never intend to back any of it up.

It's also worth separating the genuine fraudster from the inexperienced builder who overstretches — a tradesman who grew from bathroom refits to full extensions faster than his experience did. Both can sink your project; only one means it maliciously. There's no real regulation of builders' qualifications beyond experience, so don't take anyone at face value.

Checks that actually work

Directories like Checkatrade, Rated People and Find A Trader are a reasonable start — but remember that fraudsters are smart, and testimonials and references can be forged. So don't be lazy and rely on any single check:

• Get at least two references over and above trade memberships.
• Visit a completed project or speak to a former customer yourself.
• Ask about their background over a coffee — original trade, how they started, why building. It's an unusual enquiry that catches people off guard, and genuine answers come easily to genuine builders.
• Ask whether they've planned your project — a builder who talks sequencing and subcontractor booking is a builder who finishes on time.

And a timing tip that saves arguments later: good builders are booked up months in advance. Everybody presses the start button on extensions the moment the sun comes out — by which point it's already too late to build that year. If you're serious, pencil a slot in the diary early, and aim for a September start, when the summer holidays are done and the trades are all back.

One last thing: don't feed the builders

Treat your builder professionally, not as a guest. Builders are outdoor creatures — make them too comfortable and the job slows down. Feed them like a stray cat and they'll keep coming back for more (we've watched a client's baking add a week to a programme). Friendly, firm, and businesslike wins every time.

Choosing the builder is step three — the real protection starts earlier, with who you call first and a proper plan and specification so every builder prices the same job. That's the process our design and build service manages end to end. Book a free consultation and we'll help you get builder-ready before anyone gives you a price.