Yes it’s possible to build an extension above an existing pitched roof, but it’s not as simple as building directly on top of it. The existing roof would need to be removed and replaced with a new structural floor and roof designed to carry the additional load.
This type of project is often referred to as a dormer loft conversion or a roof extension, and it’s a popular way to add more living space without extending outward ideal for homes across Edinburgh and the Lothians where garden space is limited.
Here’s what to consider before starting:
- Structural integrity
A structural engineer will need to assess whether your existing walls and foundations can support another storey. In most cases, new joists and reinforcements are required before rebuilding the roof. - Planning permission
While some loft conversions fall under permitted development, a full roof extension almost always requires planning approval and building warrants in Scotland. - Design and access
Consider the roofline, staircase access, and how the extension will integrate with your existing property. Good design ensures it looks natural and adds long-term value. - Cost and timeline
Because the roof structure must be rebuilt, it’s a more complex project than a standard loft conversion but often more cost-effective than moving home for extra space.
At Sawmill Contracts, we’ve helped many homeowners in and around Edinburgh create bright, modern spaces by extending upwards. From structural design to final finishes, we handle every stage of the process safely, efficiently, and in line with Scottish building standards.