Trade Estimating
Loft conversion estimates that price the structure and the fit-out
We price the new floor structure, dormers, stairs, rooflights and fit-out from your drawings so you can quote loft conversions accurately.
In short
A loft conversion estimate prices the strengthened floor, dormers or rooflights, the new staircase, insulation, services and full fit-out.
We measure the structure and the new rooms off your drawings, price the trades and apply current UK rates.
You get an itemised, branded estimate covering the conversion from the floor structure to the finished room.
Who it's for
Builders and main contractors pricing loft conversions, and developers adding bedrooms within the roof.
A loft conversion is a structural job before it is a room. The existing ceiling joists almost never carry a floor load, so new floor beams and joists go in first, often with steel beams to support the new floor and any dormer. We price the structural floor, the steels and the trimming around the stair and openings, because this hidden structure is the foundation of the whole conversion and the part that is most often under-measured.
Dormers and rooflights set the shape and a lot of the cost. A simple rooflight conversion is far cheaper than a large rear dormer, which carries its own structure, walls, roof, window and weathering. We price the dormer construction or the rooflights as specified, allow for the changes to the existing roof, and flag where the head height or the roof pitch affects what is achievable within the rules.
Fitting out the loft to a habitable standard is a full package in a tight space. The new staircase has to land somewhere sensible in the floor below, insulation has to meet the standards within a shallow roof, and fire safety, escape and protected routes are non-negotiable in a loft. We price the stair, the insulation, the plumbing and electrics for any new bathroom, the plastering and finishes, and the fire protection, so the estimate reflects a room that will actually pass and be usable.
What the estimate includes
What drives the cost
The numbers that move the price on a loft conversions job, and the detail we measure to get them right.
Floor structure and steels
The existing ceiling will not take a floor load, so new beams, joists and often steel supports go in first. This structure is essential and a major early cost.
Dormer versus rooflight
A rooflight conversion is far cheaper than a large dormer, which adds its own structure, walls, roof, window and weathering. The roof strategy drives the price.
Staircase and space below
The new stair has to land sensibly in the floor below, and reworking the layout there to fit it can add cost beyond the loft itself.
Insulation and head height
Meeting insulation standards within a shallow roof, and any work to gain head height, affects both cost and what is achievable under the rules.
Fire safety and escape
A loft conversion triggers fire requirements: protected stairs, fire doors and escape provision. These are non-negotiable and carry real cost across the house.
New bathroom and services
An en-suite or bathroom in the loft means pumping waste, running services up and tanking the wet area, all of which add to the fit-out cost.
Common pitfalls we help you avoid
- Forgetting that the existing ceiling joists will not carry the new floor.
- Under-pricing a dormer by treating it like a rooflight conversion.
- Ignoring the fire safety upgrades the conversion triggers across the house.
- Missing the cost of reworking the floor below to fit the new stair.
- Under-allowing insulation and waterproofing within a shallow roof.
How it works
Send us the loft drawings
Upload your plans, sections and structural drawings, and tell us whether it is a dormer or rooflight conversion and the room layout.
We measure and price
We measure the floor structure, the dormers and the new rooms, price the trades and apply current UK rates.
You get a branded estimate
We return an itemised estimate under your own name, from the floor structure and steels through to the finished, compliant room.
Frequently Asked Questions
Got a job that needs pricing?
Upload your drawings and we'll come back with a professional, branded estimate, a fixed fee and a turnaround time.
Upload Your Drawings