The temptation
In small residential projects there is pressure to get a construction price early. Investors want a number. Banks want a signed quote.
So the architecture goes out to contractors before the engineering is finished.
What comes back
Without the specialty designs, a contractor prices assumptions: structure, electrical, plumbing, drainage, heating and cooling, fire safety.
The quote is either padded to cover the risk, or low and full of exclusions. Both return later as change orders.
Decide what moves the budget
Before tendering, we fix the choices that move the price: window and door systems, facade materials, heating and hot water, the lift, the energy target.
Aluminium alone can be a noticeable share of a small building's budget. Deciding it late is expensive.
Energy class is a design decision
A top energy rating is not a finishing touch. It shapes roof space, equipment and where the exterior units go.
Simulate it early with the engineer, choose once, and keep maintenance access in the drawings.
Constraints are inputs
Infill plots bring narrow facades, level changes and accessibility rules. A ramp that cannot meet the slope limit is not a solution.
Sometimes the right answer is a platform lift and a few steps kept on purpose. Decide it on paper, not on site.
The sequence
Architecture, then specialties, then a clear specification, then contractor bids. Where the rules allow, run licensing and execution drawings in parallel.
It feels slower at the start. It is faster by the end, and the price you sign is a price you can keep.