Choosing a builder

Contract type is a risk allocation

Owners tend to read contract types as payment arrangements. They are not. Each one puts the risk of the unknown on a different party, and the price differences between them are the price of that transfer.

Under a fixed price contract the builder carries the risk that the work costs more than expected, and prices that risk into the number. You get certainty and you pay for it, whether or not the risk materialises. Under a cost plus contract you carry it: you pay actual costs plus an agreed fee, so a job that goes well costs less than a fixed price would have and a job that goes badly costs more. A guaranteed maximum price is cost plus with a ceiling, which sounds like the best of both and is a fixed price contract in every respect that matters, because the builder still has to price the ceiling.

None of the three is correct in general. Fixed price suits a fully designed, fully specified project on a well understood site. Cost plus suits a project with genuine unknowns, or one where the owner wants to keep making decisions, and it requires a builder you trust and books you can actually see. The failure mode is a fixed price contract on an incomplete design, which produces a number that is technically fixed and practically fictional, and a stream of change orders that reprice the job one item at a time.

Owner-built is a job, not a saving

The federal statistics treat this as a category of its own, and they define it by who supervises rather than by who swings a hammer. [1] Roughly 50,000 such houses were completed in 2025, so it is a real path and people do finish them.

What the category actually describes is somebody doing the general contractor's job: scheduling trades, ordering materials to arrive at the right moment, resolving conflicts between trades, calling inspections, and carrying the consequences when a subcontractor does not appear. The saving is the contractor's fee. The cost is that work, performed by a person who is usually also employed elsewhere.

It is a defensible choice for somebody with time and relevant experience. It is a poor way to fix a budget gap, because the fee it removes is smaller than the cost of the mistakes it invites.

Allowances, change orders and retainage

Three mechanisms, all standard, all routinely misread.

An allowance is a placeholder for an unmade decision, and it is examined in detail on the costs sheet. In a contract, the thing to check is what happens when the actual selection differs from the allowance, in both directions. Some contracts credit an underspend and some quietly do not.

A change order prices work outside the agreed scope. Its cost is not only the work: it is the disruption to a sequence, and a change agreed at framing is a different animal to the same change agreed after the drywall. The contract should say who may authorise one, how it is priced, and whether the schedule extension is stated in the same document. A change order without a schedule consequence written into it is half a document.

Retainage is a percentage withheld from each payment until completion, and it exists to give the owner leverage over the last five percent of the work, which is the part everybody wants to leave. It is normal, it is negotiable, and its release conditions are worth reading closely.

What to ask for before signing

Five documents, all of which a competent builder can produce, and the request itself tells you something.

A schedule with named trades and dependencies, not a bar chart with three bars. A payment schedule tied to verifiable milestones rather than to dates. Current proof of insurance, obtained from the insurer rather than from a copy the builder emailed you. A written list of what is excluded from the price, which is more informative than the inclusions. And references from projects that finished more than a year ago, because the interesting question about a builder is not how the job went, it is what happened when something failed afterwards.

You are also entitled to ask how they are licensed or registered where you are building and to verify it with the issuing body yourself. That verification is yours to do rather than anyone's to assert on your behalf, including the contents sheet.

The selection criterion that actually predicts

Price is the worst single predictor of outcome, and everybody knows it and uses it anyway.

The better one is how a builder handles being told something they did not want to hear during the pre-contract conversation. Ask about a constraint you know is real: the access, the soil report, an item you suspect is missing from the quote. A builder who engages with it, prices it, and tells you what it will cost you has just demonstrated exactly the behaviour you need from them in month seven. One who waves it away has demonstrated that too.