Garden rooms, garage and basement conversions and driveways: what each costs, which need planning permission, and the drainage rules for hard surfaces.
UK basement and cellar conversions cost from about £800/m² for a basic cellar fit-out to £4,000/m² or more for a full dig-down, and what drives the price.
UK basement conversion costs: £25,000–£50,000 for an existing cellar, £80,000–£150,000+ for a London dig-out, plus structural, tanking and planning checks.
What barn and outbuilding conversions cost in the UK, how to assess feasibility, what planning class applies, and the typical Building Regs challenges.
Garden room costs range from about £7,500 to £90,000+ depending on size and spec. UK 2026 guide covers foundations, insulation, planning rules and common uses.
What a granny annexe or self-contained annexe costs in the UK in 2026, what planning permission is needed, and the key rules around Council Tax and lettings.
How much a garage conversion to a bedroom costs in the UK, what planning and Building Regs apply, and what to expect from the work.
Step-by-step guide to converting a cellar in the UK in 2026. Covers tanking, underpinning, costs, Building Regs, and when you need planning permission.
UK build basement costs in 2026: new-build basement, underpinning, tanking, and basement conversion prices per m² with full cost breakdown.
Cost to build a garage in the UK in 2026: single detached from £15,000, double from £25,000. Breakdown by type, size, foundation, and planning requirements.
Most garden rooms in England are permitted development. 2026 guide to size limits, height rules and when you do need planning permission.
Compare driveway costs per m² for block paving, resin bound, tarmac, concrete and gravel: plus drainage rules, dropped kerb fees and what to expect in 2026.
Garage conversion costs £8,000–£25,000 for a single garage in the UK. This 2026 guide covers planning, insulation, floor levels, and best room ideas.
Costs, planning rules, and practical steps for converting a garage into a living room, playroom, or home office in the UK in 2026.
