Cost: loft conversion
For comparable quotes, draw the finished rooms and define what will be delivered. Floor area alone does not describe usable space beneath slopes. Alterations to floors, stairs and services can substantially change the scope.
Editorial update on 19 September 2026
Describe the same area
Request a plan and the method used to calculate charged area. Separate floor footprint, sloping areas, storage and finished rooms. Insulation alone is not comparable to an equipped bedroom.
Split the work
Separate investigations, structural alterations, stairs, roof and windows, insulation, partitions, floors and services. Identify connections below and included finishes. Show undefined work as explicit allowances.
Compare options without double counting
Price a bathroom, dormer or fitted storage separately. Check interactions with structure, roofing and other trades. Deduct work replaced by an option and identify taxes, access and waste removal.
The three budget levels
Where your money goes
- StudiesOn quotationSurveys and checks.
- AccessOn quotationStairs, opening and making good.
- EnvelopeOn quotationDefined roof, windows and insulation.
- RoomsOn quotationPartitions, equipment and finishes.
What makes the price vary
Space
Heights after finishes.
Structure
Floor and roof assessed.
Use
Bedroom, office or bathroom.
Connections
Access to existing services.
Indicative scenarios
Check energy-work eligibility separately from other alterations. Insulation included in a quote is not confirmation of aid; do not deduct it before the application is assessed.
Frequently asked questions
Is a quick survey enough?
It helps describe the space but does not replace necessary structural, services and compliance checks.
Do roof trusses rule it out?
Have a specialist assess the case. Assume neither impossibility nor straightforward alteration.
Are stairs included?
Request an explicit item for stairs, opening, protection and making good.
How long should we allow?
Request a schedule based on actual studies, permissions, supplies and work, including restrictions on access to the home.
Your exact price, in 2 minutes
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