Two builders quote the same renovation. One number is well below the other. The natural assumption is that the cheaper builder is better value. Often the opposite is true: the lower number is not a better price for the same work. It is a less complete picture of the work.
A quote is not a fact. It is a snapshot of one builder's assumptions on one day. Learning to read what sits underneath the number is the difference between a budget you can rely on and one that quietly unravels during construction.
Every quote is built on assumptions
When documentation is incomplete, and on most renovations it is, a builder has to fill the gaps to produce a price. They assume a structural approach, a level of finish, a scope boundary, a set of site conditions. Some builders state those assumptions clearly. Others leave them invisible. Either way, the assumptions are doing a lot of the work behind the number, and you are the one who carries them if they prove wrong.
The words that decide your real cost
Most of the risk in a quote lives in a handful of terms. Knowing what they mean tells you how much of the price is actually settled:
- Allowance. A placeholder figure for something not yet chosen. If the real selection costs more, you pay the difference.
- Provisional sum. An estimate for work whose extent is not yet known, such as drainage. It is adjusted up or down once the real scope is confirmed.
- Prime cost item. A budget for a product you will select later, like tapware or tiles. Pick something dearer and the cost rises.
- Exclusions. What the builder has deliberately left out. This is often where the gap between two quotes really sits.
A quote that is mostly fixed scope is a different animal to one that is mostly allowances, provisional sums, and exclusions, even if the headline numbers look similar.
Estimate, proposal, contract: not the same thing
These words get used loosely, and the difference matters. An estimate is an early indication based on limited information. A proposal is a developed scope and price built on proper documentation. A contract is the binding agreement that actually governs what gets built and what it costs. A number scribbled against concept plans is an estimate wearing a proposal's clothing. Treating it as a fixed price is where projects come unstuck.
How a proper cost plan removes the surprises
The alternative to a guess is a cost plan built on resolved information. Through our PAC process, the scope is documented, the consultants are engaged, the assumptions are tested, and the allowances are firmed up one by one. The aim is not a lower number for its own sake. It is a number you can actually trust, with the assumptions visible and the risks named rather than buried.
That is what a quote hides, and what good pre-construction brings into the open: not the price, but everything the price depends on.
If you are comparing quotes and not sure what you are really looking at, our pre-construction process explains how we build a cost plan you can rely on. You are also welcome to send the quotes through and talk it over.
Start a Conversation