Pricing
Fixed pricing for Extension Design & Planning and Building Regulations. You'll receive a clear quotation before instruction, with statutory fees and any third-party costs identified separately where applicable.
Extension Design & Planning
From first consultation through design, planning application and liaison with the Local Planning Authority to decision.
Single Storey Extension
Rear extension, side extension
From £895
Fixed fee — confirmed before we start
- Initial consultation
- Measured survey coordination — survey costs quoted separately
- Existing floor plans
- Proposed floor plans
- Proposed elevations
- Location/site plans where required
- Extension design development
- Basic external 3D image where useful
- Up to two rounds of design amendments
- Planning application preparation
- Planning Portal submission
- LPA liaison to decision
Side & Rear / Wraparound
Combined side and rear, L-shaped extensions
From £1,095
Fixed fee — confirmed before we start
- Everything in Single Storey
- Combined side and rear design
- Coordinated roof and drainage design
Double Storey Extension
Two-storey rear or side extensions
From £1,295
Fixed fee — confirmed before we start
- Everything in Single Storey
- Ground and first floor layout design
- Two-storey elevation design
Building Regulations & Technical Design
Quoted and carried out after planning approval. Not automatically included in the planning package.
Single Storey
Building Regulations drawings for single storey extensions
From £595
Fixed fee — confirmed in quotation
Double Storey
Building Regulations drawings for two-storey extensions
From £895
Fixed fee — confirmed in quotation
Structural engineering and specialist reports
Structural engineering calculations are quoted separately as they vary significantly by project. Where specialist reports (drainage, geotechnical, etc.) are required, costs are confirmed before any work is instructed.
Not included in either package unless specifically confirmed
- •Planning authority application fees (paid directly to your LPA)
- •Building Control fees (paid to Local Authority Building Control or a Registered Building Control Approver)
- •Structural engineering calculations (quoted separately per project)
- •Drainage surveys and drainage design
- •Party Wall services
- •Specialist reports required for the application or construction
- •Major redesign following a planning refusal
- •Planning appeals
Get a fixed quotation
Prices above are starting points. Tell us about your project and we will confirm a fixed fee before any work begins.