Extensions

Single and double-storey, side-return and wrap-around extensions: what each costs per square metre, how long they take, and which need permission.

Notes on Extensions

Extensions

Glazed Extensions: The Complete UK Guide

A 2026 guide to glazed extensions: conservatories, orangeries, sunrooms, garden rooms and roof lanterns compared, from £8,000 to £60,000+, with Part L rules.

Pillar note · Published 6 Aug 2026 · 25 min read
Extensions

House Extension: The Complete Guide

The complete UK guide to house extensions: 2026 costs from £20,000 to £160,000+, single vs double storey, planning rules, design and the build process.

Pillar note · Published 6 Aug 2026 · 7 min read
Extensions

Single Storey Extension Cost & Complete Guide

Single storey extension costs £1,800–£3,000/m² in 2026: a 20m² rear extension runs £36,000–£60,000. Costs, PD rules and design ideas.

Pillar note · Published 12 Jul 2025 · 13 min read
Extensions

Porches & Canopies: Cost & Planning

An enclosed porch typically costs £3,100–£9,100 (up to about £17,500 at premium spec); a canopy costs £400–£3,500. Planning and Building Regs explained.

Note · Published 1 Jul 2026 · 10 min read
Extensions

Garden Room vs Extension: Which Should You Build?

Garden rooms cost £12,000–£65,000; house extensions £45,000–£160,000. Compare planning rules, use cases, value impact and the right choice for your needs.

Note · Published 26 Jan 2025 · 10 min read
Extensions

Kitchen Extension Cost & Ideas (Open-Plan Living)

UK 2026 kitchen extension costs, open-plan layout ideas, bifolds and rooflights explained, plus side return vs rear extension compared with worked examples.

Note · Published 10 May 2025 · 10 min read
Extensions

Oak Frame Extension Cost & Complete Guide (2026)

Oak frame extension costs, design options, planning considerations, and how the build process works: a complete UK guide for 2026 with real price ranges.

Note · Published 25 Jul 2026 · 9 min read
Extensions

Double / Two-Storey Extension Cost & Guide

UK guide to double and two-storey extensions in 2026: costs, value vs single storey, permitted development limits, structural considerations, and design ideas.

Note · Published 3 Jul 2025 · 11 min read
Extensions

Garage Extension Cost & Ideas (2026)

How much does a garage extension cost in 2026? Full cost breakdown, planning rules, structural options, and design ideas for UK homeowners.

Note · Published 25 Jul 2026 · 10 min read
Extensions

Adding Porch

Adding a porch costs £3,000–£15,000 depending on type. Learn what needs planning permission, which Building Regs apply, and how to get accurate quotes.

Note · Published 2 Sept 2026 · 9 min read
Extensions

Bedroom Extension Cost: 2026 UK Price Guide

How much does a bedroom extension cost in 2026? Typical UK prices range from £20,000 to £80,000+. We break down every factor and show worked examples.

Note · Published 30 Jul 2026 · 8 min read
Extensions

House Extension Design Ideas

UK house extension design ideas: natural light, blending old and new materials, flooring continuity, open-plan layouts, and real cost guidance.

Note · Published 8 Feb 2025 · 9 min read
Extensions

Glass Box & Bifold Extensions: Cost & Ideas

Glass box and bifold door extensions in the UK: glazing types, 2026 costs, thermal performance, overheating risks, planning rules, and design inspiration.

Note · Published 9 Jan 2026 · 9 min read

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