Build cost includes: foundations, drainage, walls, insulation, roof, standard windows/doors, first-fix electrics & plumbing, plasterboard/plaster, basic finishes. Not included: kitchens, bathrooms, high-end finishes, landscaping, professional fees, VAT.
Typical range: £5,000 - £8,000 (avg. £6,500)
Typical range: £7,000 - £10,000 (avg. £8,500)
Typical width: single door ~1m, double doors ~1.5-2m, large opening ~3-4m
Typical range: £3,000 - £5,000/m (avg. £4,000)
Surveys & Site Investigation
Location and site plans (typical: £25-75)
Professional Fees
Note:
Structural Engineer and Quantity Surveyor fees shown are indicative estimates based on typical UK market rates (2026).
Actual fees vary depending on project complexity, scope of services required, and individual consultant pricing.
Fee calculated automatically based on construction cost tier. Typical residential extensions: £1,200-£5,000.
Fee calculated automatically based on construction cost tier. Optional for projects under £100k.
Architect fees by RIBA stage: Fees can be calculated as percentage of construction cost or as fixed fees for each stage. Total fees across all stages typically sum between 8-15% of construction cost (for listed buildings up to 17% and higher). The smaller project potentially the higher fees and vice versa.
Architect Fee Tier:
Calculating...
Concept Design (RIBA Stage 2)
Planning Application (RIBA Stage 3)
Building Warrant (RIBA Stage 4)
Tender Support (RIBA Stage 5)
Construction Oversight (RIBA Stage 6)
Statutory Fees
Standard fee for domestic extensions (Edinburgh Council, July 2025). Retrospective applications incur 25% surcharge (£446.25).
Auto-calculated based on construction cost (Edinburgh Council rates, April 2025). Fees may vary by local authority.
Contingency
Contingency covers unexpected costs during construction (site conditions, specification changes, unforeseen structural work).
⚠ Warning: A contingency budget is strongly recommended for renovations and extensions to existing buildings. Unforeseen issues (hidden structural problems, services conflicts, ground conditions) are common and can significantly impact costs. Most professionals recommend a minimum 10-15% contingency.
Cost Breakdown
Build Cost (ex VAT)£0
Kitchen£0
Bathroom£0
Structural Openings £0
Total Construction Cost (ex VAT)£0
Contingency £0
Construction + Contingency (ex VAT)£0
VAT (20%)£0
SUBTOTAL: Construction (inc VAT)£0
Ordnance Survey Maps£0
Measured Survey£0
Ground Survey£0
SUBTOTAL: Surveys & Site Investigation£0
Bill of Quantities £0
Structural Engineer £0
Architect - Concept Design £0
Architect - Planning Application £0
Architect - Building Warrant £0
Architect - Tender Support £0
Architect - Construction Oversight £0
SUBTOTAL: Professional Fees£0
*Professional fees shown include VAT where providers are VAT registered (indicated by checkboxes above)