An attic is the space directly under the roof of a house, above the top floor. Depending on the roof construction and ceiling height, an attic can serve as storage, an extra bedroom, home office or hobby room. The difference with a loft space is that an attic typically has a higher standing height and is accessible via a permanent staircase.
Attic vs. loft space
| Feature | Attic | Loft space |
|---|---|---|
| Standing height | At least 2.10 m at the highest point | Often less than 1.80 m |
| Access | Permanent stairs | Loft ladder or hatch |
| Use | Living space, bedroom, office | Storage |
| Insulation | Usually insulated (or can be) | Often uninsulated |
| Floor | Finished floor | Loose boards on joists |
Converting an attic — what to consider
Structure
- Floor load capacity — An existing attic floor may not be rated for residential use (150 kg/m²). Have this checked
- Roof construction — A purlin roof allows for more open space than a rafter roof with many trusses
Insulation
- Roof insulation — Install at least 120 mm PIR or mineral wool between and/or under the rafters
- Vapour barrier — On the warm side (interior) to prevent condensation
- Ventilation — Ensure sufficient airflow between insulation and roof tiles
Regulations
- Planning permission — Adding a dormer or raising the roof usually requires a permit
- Building regulations — Minimum standing height, natural light, ventilation and escape routes
Common mistakes
- No vapour barrier — Moisture condenses behind the insulation, causing wood rot and mould
- Insufficient ventilation — Overheating in summer, condensation problems in winter
- Load capacity not checked — Floor may sag under heavy furniture
Related terms
- Loft space
- Roof insulation
- Truss
- Purlins
- PIR insulation
- Breathable membrane
- Dormer