- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 01 Jun 2018
Dormers are becoming more common in homes as they can help create extra headroom in spaces that may otherwise be too small or too low for habitation. They enable the creation of rooms in the roof or loft without needing to construct a new storey. Dormers will typically have dormer windows set into them to allow light and ventilation.
There are a number of different types of dormers including:
The insertion of dormer windows as part of a loft conversion does not normally require planning permission. However, If the roof space is altered or extended and it exceeds specified limits and conditions, permission may be necessary. It may also be necessary to obtain permission within conservation areas, National Parks, Areas of Outstanding Natural Beauty or the Broads, or if the building is listed.
Dormer windows may require building regulations approval.
 Find out more
 Related articles on Designing Buildings Wiki.
- A-frame house.
- Building regulations.
- Conical roof slating.
- Conservation area.
- Cool roof.
- Domestic roof.
- Domestic windows.
- Green roof.
- Listed building.
- Loft conversion.
- Long span roof.
- Mansard roof.
- Roof gardens.
- Roof insulation.
- Window parts.
 External references
Featured articles and news
What collaborative working achieves and how it can be put in place.
BSRIA publishes the 2019 edition of its small but concise annual databook.
Using QSAND to measure the performance of disaster response.
What U-values are, why they matter and how they are calculated.
The need to ensure that we plan for all aspects of our bio-economy
BSRIA calls on government to reach deeper into the causes of pollution.
George Demetri brings a whole new level of technical knowledge to Designing Buildings Wiki.
Quality professionals need to take an active role in driving the completion process forwards.
The innovations needed to move from rhetoric to realisation.
Creating a sense of place, with radically-low running costs and the highest comfort levels.
A conversation between David Mitchell and Caitlin DeSilvey.
A quick guide to brick sizes.
The Union Street development in Southwark was a passion, as well as a business endeavour.