Pricing small building jobs is a different problem from pricing a hospital wing. A lot of building estimating services are really set up for large contractors with several tenders running at once, and they bring that thinking with them: volume, pipelines, minimum contract values. A small builder doesn't work like that, so a service that suits one has to work differently.
You're usually pricing one job. It has to be right. And you're still on site running the last one while the drawings for the next sit in your inbox waiting for an evening you haven't got.
One job, one deadline, one builder
A national contractor might have an estimating team juggling a handful of bids in the same week. A small builder has one bid and whatever time is left after the day's work. The service has to fit around that single job's deadline, not a queue of other people's tenders that yours joins at the back of.
That changes what you should expect from whoever does the measuring. Questions about the drawings come to you directly. The deadline is yours, agreed before work starts. And the estimate is written for the person who'll actually be running the job, not for a commercial manager who'll pass it down the line.
It changes what comes back, too. A small builder doesn't need a spreadsheet the size of a phone book with a cover memo on top. You need quantities you can follow, rates you can check against what your own suppliers charge, and a total you can put your name to (with enough detail underneath that you can answer the client when they ring with questions on a Sunday).
Pricing small building jobs without a minimum size
A loft conversion deserves the same measured approach as a much bigger job. It has structure, insulation, a new stair, dormers, electrics, plastering and making good. Each of those is a line that can be missed, and on a small job one missed line is a much bigger share of your margin than it would be on a large contract.
Some services quietly steer you toward larger contracts, because that's where their model makes money. A service built for small builders doesn't. It measures what's in front of you: the single-storey rear extension, the garage conversion, the refurb with a new kitchen and a knocked-through wall that needs a steel.
A small job isn't a simple job. It's the same set of trades squeezed into a tighter margin, which is exactly why it needs measuring rather than guessing.
There's a habit in the trade of treating small jobs as something you can price from memory. You've done a dozen extensions, so you know roughly what one costs. The trouble is that no two sets of drawings are the same. One has a stepped foundation because of the ground. Another has a vaulted ceiling with a steel ridge beam. A third specifies underfloor heating nobody mentioned when you went round to look. Memory prices the average extension. The drawings describe this one.
What a small builder actually needs back
Strip away the jargon and the list is short. When you send drawings off to be priced, this is what should come back to you:
- Measured quantities. Every element taken off the drawings to NRM2, so you can see what's been counted and what hasn't.
- Current, local rates. Priced on today's UK rates for the area the job's in, not a rate book from a few years back.
- Clear assumptions. Anything the drawings don't show, written down, so you know where the risk sits before you submit.
- A breakdown the client can read. Itemised enough that a homeowner can see where the money goes without you explaining it line by line.
- Your deadline met. Back before your bid date, with time left to check it and add your own margin and overheads.
Anything beyond that is nice to have. Anything short of it leaves you filling the gaps at night, which is the job you were trying to hand over in the first place. If that's where your evenings go now, it's worth looking at what slows down pricing a job yourself. For most builders it's the measuring, not the pricing.
A fee that makes sense against the job
The fee has to make sense against a smaller contract value, not just a large one. That's the point of building the service around this end of the market rather than taking a big-contractor model and trimming it down until it sort of fits.
At MPE the fee is fixed and agreed up front, before any measuring starts. You know what it costs before you commit, and it doesn't creep because the drawing set turned out to have more sheets than expected. For a small builder that matters. You're often deciding whether the job is worth bidding for at all, and an open-ended fee makes that decision harder.
Think of it as a trade. On one side sits the fee. On the other sit the evenings you'd spend measuring, plus the risk that something gets missed because you measured it tired after a day on the tools. Most small builders who've lost money on a job can point to the exact line that did it.
How to tell if a service is built for you
You can usually tell within one conversation. Ask about the smallest job they'll price. Ask whether the fee is fixed before they start. Ask to see an example of what they send back, and check whether it's something you could hand straight to a homeowner.
If the answers come back vague, or the example looks like it was written for a quantity surveyor rather than a builder, it probably wasn't designed around your kind of work. That doesn't make it a bad service. It just makes it someone else's.
The kitchen table test
Here's a simple rule for pricing small building jobs. Before you bid, ask yourself whether you could explain every line of your price to the client across their kitchen table. If there are lines you'd struggle to explain, or lines you suspect are missing, the estimate isn't finished yet.
A service built for small builders should hand you an estimate that passes that test every time, on the modest extension just as much as on the bigger job you're hoping to land next.