Use these practical guides to understand the decisions, costs and approvals that usually shape a London residential project. The information is general and does not replace address-specific planning, legal, structural or cost advice.

✓ No charge✓ Immediate access✓ Written for London homeowners✓ Updated for 2026
Free online tool — reviewed August 2026

London Construction Cost Calculator

Estimate a realistic low-to-high construction range for extensions, loft conversions, refurbishments and new-build homes before requesting a detailed quotation.

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Free PDF - updated August 2026

Planning Permission Guide 2026

A clear route through planning permission, permitted development, validation, fees, conservation areas, council monitoring and refusals.

  • When planning permission may be needed
  • What a valid application usually includes
  • Current 2026 statutory fees and typical timescales
  • What happens during determination
  • Options after a refusal
Free PDF - updated August 2026

Extension Costs in London 2026

A budget-planning guide that separates construction, VAT, professional fees, consultants, fit-out, risk allowances and contingency.

  • Indicative London construction ranges
  • Example budgets by extension size
  • Costs commonly omitted from early estimates
  • Ways design decisions affect cost
  • A printable budget checklist
Free PDF - updated August 2026

Loft Conversion Guide 2026

A practical guide to feasibility, roof types, planning, permitted development, Building Regulations, fire safety, structure and stairs.

  • Early feasibility checks
  • Dormer, rooflight, hip-to-gable and mansard options
  • Planning and conservation-area constraints
  • Building Regulations priorities
  • Consultants and project sequence

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How much could your project cost?

Use our free construction cost calculator to check a rough estimate of how much your extension, loft conversion, refurbishment or new-build project could cost. It is an early budgeting guide rather than a contractor quotation.

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