Conservatory or garden room

The short answer

A conservatory is a largely glazed structure often exempt from building warrant if under a certain size and used as an unheated space, while a garden room is a more solid, insulated structure suited to year-round use as an office or living space. Which category a project falls into affects both planning and warrant requirements. Costs depend on structure type, glazing extent and whether services such as heating and electrics are installed.

What the project involves

A conservatory typically has a mostly glazed roof and walls attached to the house, while a garden room can be attached or freestanding, built with insulated walls and roof more like a small extension, often used as a home office or gym.

Consents and regulations in Scotland

Small, unheated conservatories below defined size and height limits are sometimes exempt from a building warrant, but this exemption narrows once heating, plumbing or habitable use is introduced. Freestanding garden rooms in the garden are often exempt from planning permission if within size limits, but attached structures and those close to a boundary can need consent.

Sequencing

Decide on conservatory versus garden room specification first, since this determines the consent route, then base and foundation work, structure, glazing or cladding, and finally services if included.

What commonly goes wrong

Assuming exemption applies without checking size and use limits with the council, poor insulation making a garden room too cold or hot for year-round use, and underestimating base and foundation cost on soft garden ground.

What it usually costs

Indicative ranges only, to help you judge a quote. They are not an estimate for your property — only the business doing the work can give you that.

• Basic glazed conservatory: the lower-cost option, suited to occasional use rather than year-round living.
• Insulated garden room: costs more per square metre due to solid insulated construction, but usable in all seasons.
• Base and foundations: cost varies with ground conditions, more so on sloping or waterlogged gardens.
• Electrics and heating: adds a moderate cost but is usually necessary for year-round office or gym use.

What to do, in order

1. 1Decide whether a lightweight conservatory or an insulated garden room best suits the intended use.
2. 2Check exemption limits for planning and building warrant with the relevant council.
3. 3Prepare the base or foundation appropriate to the ground conditions.
4. 4Erect the structure and complete glazing or cladding.
5. 5Install electrics and heating if the space is to be used year-round.
6. 6Confirm final sign-off if a warrant was required.

Local detail for the Lothians

• In Edinburgh's conservation areas, a conservatory or garden room visible from the street or a shared area is more likely to need planning permission than one tucked away at the rear.
• Tenement flats with a share of a back green sometimes install a garden room, which usually needs the agreement of other owners with rights over that ground.
• Coastal gardens in East Lothian can expose garden room timber cladding to salt-laden wind, making durable, weather-resistant materials worth specifying.
• West Lothian new-build gardens are often smaller, so a garden room's footprint relative to the remaining garden can be a planning consideration.

When you need a professional

A building standards officer can confirm exemption limits, and a structural or timber-frame specialist should be involved for a fully insulated, heated garden room intended for year-round use.

Common questions

Is a garden room exempt from planning permission?

Often, if freestanding, within size limits and not used as a separate self-contained dwelling, but rules vary and checking with the council is worthwhile before committing.

Do conservatories need a building warrant?

Small, unheated conservatories under certain size limits are often exempt, but this changes once heating or habitable use is added.

Related pages

• House extension

  Adding floor space to a house, from a single-storey side extension to a two-storey addition.