Extensions, loft conversions, refurbishments: the domestic end of building work rarely interests a large contractor, but it still needs pricing with the same care as anything else going out to tender. A domestic building estimate is often the most closely read document a small builder ever produces, because the person reading it is spending their own money on their own home.
That's a different kind of pressure from a commercial tender. It's also a different kind of opportunity.
Smaller contract value, same measuring standard
A domestic estimating service for builders measures the job to the same standard as a commercial one, NRM2 throughout, because the contract being smaller doesn't make the risk of missing a line any smaller for the builder carrying it.
If anything, the risk is higher. On a large job, a missed item is a small percentage of the whole and there may be contingency to absorb it. On a kitchen extension, the same missed item (a length of drainage, a steel, the making good to a ceiling) can be the difference between a profitable job and one you did for nothing. There's rarely any slack in a domestic price to soak it up.
Domestic work also carries costs that commercial jobs don't. You're working in someone's home. There's protection to floors and furniture, dust control, keeping a kitchen or bathroom usable, and working hours that fit around a family. None of that shows up on the drawings. All of it belongs in the estimate.
Then there's the existing building itself. Older houses rarely match their drawings exactly. Walls aren't quite where they're shown, floors aren't level, and opening up a ceiling can reveal joists running the other way. A domestic building estimate can't predict every surprise, but it can measure what's drawn carefully, set out what's been assumed about the existing structure, and make clear which kinds of discovery would change the price. That protects you and it's fair to the client.
What goes into a proper domestic building estimate
Whether it's a single-storey extension, a loft or a full refurb, a domestic estimate worth sending should cover these:
- Measured quantities. Every element taken off the drawings, from foundations to decoration, so nothing is priced by eye.
- Work to the existing house. Opening up, temporary support, making good and matching existing finishes.
- Preliminaries for a lived-in home. Protection, welfare, skips, scaffold and any restrictions on working hours or access.
- Clear allowances. Where the client is still choosing the kitchen, tiles or sanitaryware, an allowance with a description of what it covers.
- Written assumptions and exclusions. Anything not shown on the drawings, so the homeowner knows exactly what the price includes.
That list isn't about making the estimate longer. It's about making sure the conversation you have with the client later is about changes they've asked for, not items you forgot.
On a domestic job, the estimate isn't just your price. It's the first proof the homeowner gets that you know what you're doing.
Built to fit a domestic client's expectations
Domestic clients often want to see the breakdown behind a price in more detail than a commercial client would. A properly itemised estimate answers that upfront, rather than leaving the builder fielding questions about a single figure.
Homeowners usually get more than one price. They compare them at the kitchen table, often with no construction background, and they're looking for reasons to trust one builder over another. A single total gives them nothing to go on except the number. An itemised estimate lets them see that you've included the drainage, the steel and the plastering, and helps them spot when a cheaper quote hasn't.
It also makes the job easier to run. When the client asks for a change halfway through, you have an agreed breakdown to price it against. There's more on this in why your estimate is the job before the job, and it's the same reason the breakdown pays for itself on almost every domestic project.
Priced for the domestic end of the market
The service is priced to make sense against a domestic contract value, so getting a job measured properly doesn't cost a disproportionate share of what the job is worth.
At MPE the fee is fixed and agreed before any work starts. You send the drawings, we measure every element to NRM2, price it on current UK rates local to the job, and deliver the estimate through the client portal before your deadline. You then check it, add your margin and send it to the homeowner under your own name.
Why main contractors pass on this work
Large contractors avoid domestic work for sound reasons. The contract values are small, the clients need more of their time, and the projects don't fit a business built around bigger programmes. That leaves the market to small and medium builders, which is good news, provided they price it properly.
The danger is treating domestic work as the easy end of the trade. It isn't. It's the end where the client is least able to absorb surprises and most likely to remember who caused them.
Price it with the same discipline a main contractor would bring to a commercial tender, though, and domestic work can be steady, profitable and a reliable source of recommendations. Homeowners talk to each other, and a builder whose price held from start to finish is the one they pass on.
The neighbour test
Before you send a domestic price, ask whether you'd be comfortable if the homeowner showed it to a neighbour who's just had similar work done. Would every line make sense to them? Would anything obvious be missing? If you'd be happy for your estimate to be read that way, it's ready to send. If you'd rather they didn't look too closely, the domestic building estimate needs another pass first.