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How to plan a house extension — suitability, budget, permitted development, planning permission, party wall, building regs and choosing a builder.

House extension timelines from first idea to finished space — design, planning, building regs and build time by type, plus what causes delays.

House extension costs by type — single-storey, side return, wraparound and double-storey. UK and London price ranges, plus what drives costs up.

How to plan a basement conversion in London — suitability, budgeting, planning permission, Party Wall Act, waterproofing and choosing a builder.

Basement conversion timelines by project type — 6 weeks for a cellar fit-out to 12 months for a new excavation. Plus what happens before work starts.

Basement conversion costs by type — cellar conversion, floor lowering and new excavation. UK and London price ranges and what drives costs up.

A step-by-step guide to planning a loft conversion — suitability, budgeting, planning permission, the Party Wall Act and finding the right builder.

Loft conversion timelines by type — from 4 weeks for a Velux to 12 weeks for a mansard. Plus what happens before work starts and what causes delays.

Loft conversion costs by type — Velux, dormer, hip-to-gable and mansard. UK and London price ranges, what's included and what drives costs up.