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Simplest option — roof windows fitted into the existing roof slope, no structural changes to the roofline. From ~£20,000
A box-shaped extension built out from the roof, adds significant headroom and floor space. From ~£35,000
Replaces the sloped hip end with a vertical wall, creating much more space. Only for semi-detached or detached homes. From ~£45,000
The entire roof slope is rebuilt at a near-vertical angle, maximising space. Usually needs planning permission. From ~£55,000
Combines rear and side dormers for maximum space. Common on Victorian terraces. From ~£55,000
