Garden Rooms: The Complete Buyer's Guide

Garden rooms have become one of the UK's most popular home improvements — a dedicated space separate from the house for working, creating, exercising, or relaxing. But the market ranges from high-quality bespoke structures to cheap imports that fail within a few years. This guide helps you make the right choice.

The terms are used interchangeably but there are meaningful distinctions. A garden office is designed primarily for work — sound-insulated, with good natural light and connectivity. A garden room is a more general-purpose habitable space. An outbuilding or summerhouse is typically not insulated for year-round use. When a supplier markets something as a "garden room", confirm whether it is genuinely insulated for winter use — many are not.

The garden room market is poorly regulated and quality varies enormously. Key questions to ask any supplier: What is the wall insulation depth and U-value? What brand and specification of glazing is used? What is the warranty on the structure and the materials? Can you provide references from customers who have owned the room for 3+ years? How is the floor constructed and what damp-proofing is used?

A garden room needs a dedicated electrical circuit from the house — not an extension lead. The circuit must be run in armoured cable or through conduit, and the work must comply with Part P of the Building Regulations (typically meaning a registered electrician must carry it out and sign off the circuit). Budget £800-£2,500 for the electrical work depending on distance and specification. Good connectivity (Wi-Fi or ideally a direct ethernet cable run) is essential for a home office.

The electrical circuit to a garden room is one of the most commonly bodged aspects of the project. A proper armoured cable installation, done by a registered electrician, is essential — it is also a requirement, not optional.

— NICEIC

Every garden room needs a proper base — either a concrete slab, a screw pile system, or concrete pad foundations. The type depends on the structure's weight, the ground conditions, and any desire to avoid disrupting the garden significantly. Screw pile systems are increasingly popular as they can be installed quickly, cause minimal ground disruption, and are fully removable. A level, properly drained base is non-negotiable for the structure to perform correctly.

• Insulation depth: minimum 90mm, ideally 140mm+ for year-round use
• Glazing U-value: aim for 1.0 W/m²K or better on glass units
• Electrical: separate armoured circuit, not an extension lead
• Planning: confirm permitted development compliance before ordering
• Base: always use a professional for groundworks