Building Cost Guides — London 2026

Velux, dormer, hip-to-gable, L-shaped and mansard conversion costs — what they include, what they don't, and the eight factors that move the price.

Rear extensions, side returns, wrap-arounds, kitchen extensions and double-storey — real London prices with a breakdown of what's included and what changes the figure.

Partial refurbs, full flat renovations, and complete Victorian terrace transformations — what each level includes and the six factors that drive the final figure.

Kitchen replacements, full renovations, structural openings, and kitchen-plus-extension — honest 2026 prices with clear inclusions and exclusions.

Small refresh, full renovation, and luxury bathroom fit-out — what's included at each level, what client-supplies, and what changes the price.

Single and double garage conversions in London — what's included, planning and Building Regs requirements, what en-suites add, and whether it adds value to your property.

3-bed to 6-bed HMO conversions in London — fire safety requirements, en-suite options, licensing obligations, and the investment case for HMO over single-let.

Wall removals, steel beam installations, chimney breast removals, and structural openings in London — what each type costs, what's included, and the compliance you can't skip.