Garden Room Advice & Installation Support

Create space to work, unwind or spend time together. EvoHome helps you plan your garden building, compare suitable specialists and coordinate the project across Hampshire and the South. We consider intended use, position, access, ground conditions, fabric and services before quotations are compared. Garden rooms have become one of the UK's fastest-growing home improvement categories, driven by the shift to hybrid working and the desire for dedicated spaces separate from the main house.

A well-built garden room adds genuine usable space and typically increases property value by £15,000–£30,000.\n\n## Planning Permission\n\nMost garden rooms fall under Permitted Development rights, meaning no planning permission is needed if they meet specific criteria: single storey, maximum 2.5m height at the boundary (or 4m with a dual-pitched roof centrally), no more than 50% garden coverage, and no sleeping accommodation.

Conservation areas and listed buildings have additional restrictions.\n\n## Insulation Standards\n\nA garden room intended for year-round use needs insulation comparable to a house extension. Target U-values of 0.15–0.20 W/m²K for walls, floor and roof ensure comfort without excessive heating costs. SIP (Structural Insulated Panel) construction achieves excellent thermal performance in a slim wall build-up.

\n\n## Electrical and Connectivity\n\nProfessional electrical installation is essential — a dedicated armoured cable from the main consumer unit provides reliable power. For home offices, hardwired ethernet or mesh WiFi should be planned from the outset. Heating options include electric radiators, underfloor heating, or mini-split air conditioning for heating and cooling.

\n\n## Hampshire Considerations\n\nGround conditions in Hampshire vary significantly — from chalk downland to clay lowlands. Foundation choice should reflect local soil conditions. Coastal areas benefit from weather-resistant cladding and enhanced glazing specifications. ## Start With the Intended Use A home office, a gym, a treatment room, a hobby workshop and a garden bar make very different demands on insulation, power, heating, acoustics, flooring and glazing.

The specification should follow the use, and the use should be settled before anyone quotes. ## Construction Systems - Timber frame with insulated panels: the most common approach, flexible and well proven. - Structurally insulated panels: fast to erect and thermally efficient, less tolerant of on-site change. - Modular or pod systems: quick and predictable, limited customisation.

- Traditional masonry outbuildings: highest cost and longest programme, longest life. ## Insulation, Heating and Year-Round Use The single biggest difference between a garden room used all year and one abandoned in January is the fabric. Ask for insulation values for floor, walls and roof, the glazing U-value, and how airtightness and ventilation are handled.

Heating is usually an electric panel heater or an air conditioning unit that…