When you're planning an extension, the roof choice affects cost, planning permission, internal ceiling height, and how the extension looks against the existing house. Both flat and pitched have their place — the right answer depends on your specific project.
Is a flat roof extension worth less than a pitched one at resale?
On a contemporary or 1960s+ property — no, often the opposite. On a Victorian or Cotswold-style property — surveyors may discount a flat roof slightly.
Can I have a flat roof under permitted development?
Often yes — flat roofs are easier to keep within PD height limits. Always check with your local planning department or architect.
What's the cheapest extension roof option?
EPDM rubber flat roof on a 25 m² extension typically £3,000–£3,500 (roof element only, excluding any internal work).
Evans Roofing & Maintenance Ltd, Witney, Oxfordshire. Call 07960 482233 for a free written quote.