What are the costs for a house extension in Belfast?

In Belfast, the cost of a house extension typically ranges from £1,200 to £2,500 per square metre in 2026. This can vary based on the design, materials, and whether you require additional features such as skylights or bi-fold doors. For example, a standard 20 square metre extension could cost between £24,000 and £50,000. It's also essential to check local planning regulations, which can impact both costs and timelines.

When choosing a builder, ensure they hold relevant certifications such as NICEIC for electrical work or are registered with the Federation of Master Builders. This not only guarantees a standard of quality but also assures you that the work adheres to local building codes.

If you’re considering a loft conversion or garage conversion, expect similar pricing structures, with loft conversions often costing around £30,000 to £50,000 depending on the level of finishing and structural changes needed.

Looking for professionals in your area? Find vetted providers on TradeMatch.