What is the cost in 2026 for building extensions in Harlow?

In 2026, the cost for building extensions in Harlow can vary significantly based on size and complexity. Generally, a single-storey extension can range from £1,500 to £2,500 per square metre, while a two-storey extension might cost between £1,800 and £3,000 per square metre. For a standard single-storey extension of around 20 square metres, you might expect to pay between £30,000 and £50,000.

If you’re considering a garage conversion, the average cost typically falls between £8,000 and £15,000, depending on the level of work required and any additional features like insulation or plumbing. Loft conversions in Harlow also range widely, costing around £20,000 to £40,000 on average, depending on whether you choose a dormer or a roof lift.

It’s crucial to hire qualified professionals for these projects. Ensure that your builders are certified, such as being registered with NICEIC for electrical work or Gas Safe for any gas installations.

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