Pitched or flat roof for a garden room?
The short answer
Most garden rooms have a flat roof: it's simpler, cheaper and keeps the building low. A garden room can be 3 m tall with a flat, mono-pitch or other roof, but 4 m with a tiled or slated pitched roof. Choose a pitched roof if you need headroom, for a gym or golf simulator, or want the room to match the house.
Height limits by roof
| Roof | Height limit |
|---|---|
| Flat roof | 3 m |
| Mono-pitch (single slope) | 3 m |
| Pitched, with felt shingles or metal | 3 m |
| Pitched, with tiles or slates | 4 m |
Flat roofs
- Cheapest and quickest to build, and the modern look most suppliers sell.
- Membrane: usually EPDM rubber or GRP fibreglass. The roof is where garden rooms most often fail, so ask about the membrane, its guarantee and the edge details.
- A slight fall is built in so rain runs off to a gutter. "Flat" roofs aren't truly flat.
- Headroom: about 2.4 to 2.6 m inside within the 3 m limit.
Pitched roofs
- More headroom under the ridge, and a vaulted ceiling that feels bigger.
- Tiles or slates are needed for the 4 m limit, which adds weight and cost, and needs a stronger structure.
- Matches the house, which can suit older or period properties.
- Watch the eaves: walls are lower at the sides, so plan furniture and doors around the higher middle.
Which to choose
| If you want… | Choose |
|---|---|
| An office or studio at the lowest cost | Flat roof |
| Solar panels on top | Flat or south-facing mono-pitch. See solar panels |
| Height for a gym, golf simulator or mezzanine storage | Tiled or slated pitched roof |
| A traditional look that matches the house | Tiled or slated pitched roof |
Common questions
How high can a garden room be with a pitched roof in Ireland?
Up to 4 m, but only if the pitched roof is finished with tiles or slates. Any other roof, including flat, mono-pitch and felt or metal pitched roofs, has a 3 m limit.
Does a mono-pitch roof get the 4 m limit?
Not usually. The 4 m limit is for a tiled or slated pitched roof. Most mono-pitch garden room roofs are rubber, fibreglass or metal, so the 3 m limit applies. If yours is unusual, ask your council for a Section 5 declaration.
What is the best flat roof for a garden room?
EPDM rubber and GRP fibreglass are the two common choices. Both last for decades if installed well with a slight fall for drainage. Ask what guarantee covers the roof membrane specifically.
Sources
Garden room companies serving Dublin
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