Yes. We recommend all clients keep a contingency of around 10 to 15% of the build cost. Older properties in particular can hide surprises such as unrecorded drains, historic alterations or poor previous work. Our detailed surveys minimise unknowns, but a contingency means an unexpected discovery is an inconvenience rather than a crisis.
BASEMENT CONVERSIONS
Explore the different types of ground floor house extensions here.
HOUSE EXTENSIONS
Loft conversion or extension: what actually works for your property type? A clear guide before you think about cost or process.
LOFT CONVERSION
Most loft conversions in London do NOT require planning permission if they meet certain rules - but there is other required paperwork.
LOFT CONVERSION
Explore the different types and costs of Loft Conversions for London in 2026.
HOUSE EXTENSIONS
Explore the different types of ground floor house extensions here.
BASEMENT CONVERSIONS
There are a lot of moving parts that go into a basement conversion - let us help you understand a few ore of them.
