Exclusions and assumptions: the small print that saves jobs

Every price is built on a picture of the job. Exclusions and assumptions are where you show the client that picture, so that when reality differs, the conversation is "that was outside the quote" rather than "you should have known". Done well, this section is not small print at all. It is the most protective page you will ever write.

Why the section exists

A quote can only price what is known. The ground, the hidden pipework, the client's future changes of mind: none of it is on the drawings. You have two honest tools for the gap. An assumption states the condition your price relies on ("we have assumed the existing drainage run is serviceable"). An exclusion states what the price simply does not cover ("asbestos removal is excluded"). Together they draw the boundary of the job, and a boundary drawn at quote stage costs nothing. The same boundary drawn mid-job, with a floor up and a client in shock, costs goodwill, momentum and sometimes the relationship.

There is a commercial angle too. The builder who lists assumptions looks like the one who has actually thought about the job. Put your quote next to a rival's single-paragraph price and the difference in perceived competence is stark, which is a point we develop in presentation is a price signal.

The exclusions most domestic quotes need

Every job is different, but a domestic extension or refurbishment quote in the UK usually needs most of this list considered, even if some items end up included:

The point is not to exclude everything and quote for a job made of air. A quote that excludes plastering on a plastering job is a joke, and clients can tell. The point is to exclude the genuinely unknowable and unpriceable, and to include everything a competent builder can measure. If a competitor's cheaper price turns out to be cheaper because it silently excludes the scaffold, your quote's clarity is what wins the comparison, a pattern we cover in red flags in building quotes.

Assumptions: the price's load-bearing sentences

Good assumptions are specific, checkable, and paired with what happens if they fail. Weak: "subject to site conditions." Strong: "Priced on the basis that the existing foundations at the party wall are a minimum 600 mm deep, per the engineer's assumption. If trial holes show shallower footings, underpinning will be priced separately before proceeding."

The pattern is always: what we assumed, why it is reasonable, what happens if it is wrong. Common assumptions worth writing on domestic work:

• Free access to the work area during stated working hours, with parking or permits available.
• Water and electricity available on site at no charge.
• Existing structure, drainage and services in serviceable condition except where the quote says otherwise.
• Work carried out in one continuous visit; return visits caused by client-side delays chargeable.
• The specification is as the drawings dated X; changes are variations.

Writing it so people actually read it

Three rules of presentation. First, give exclusions and assumptions their own headed section in the quote, not a footnote in grey type. Small print that looks like small print reads as something to hide. Second, keep each item to one or two plain sentences; legalese makes homeowners defensive and hides your actual meaning. Third, walk the client through the section when you present the price. Thirty seconds of "here is what is not included and why" turns the section from defensive paperwork into visible honesty, and it is often the moment a wavering client decides you are the professional in the race.

And keep the list job-specific. A recycled boilerplate list with someone else's items on it ("no allowance for thatch repairs" on a Salford semi) tells the client nobody read the document. Start from a standard list, then strike and add per job.

The paper trail when an exclusion bites

When something excluded turns up (the ground is worse, the wiring is dead, there is asbestos in the ceiling), the sequence should already be defined in the quote: stop the affected work, notify the client the same day with photos, price the additional work in writing, get written approval, proceed. This is the same loop as handling variations, and it works because you set it up before anyone was upset. The exclusion clause is what makes the mid-job conversation calm: you both agreed, in writing, months ago, that this exact situation would be handled this exact way.

A quote produced as a full itemised bill makes the boundary sharper still, because everything included is visibly listed line by line, which quietly defines everything not listed. That is how QS Quoter approaches it: the job becomes a complete bill of quantities at your rates, every line editable, so the "inside the price" side of the boundary is explicit rather than implied, and your exclusions section only has to carry the genuinely unknowable.