How Much Value Does a Loft Conversion Add?

How much value does a loft conversion add?

A well-built loft conversion can add up to 20% to the value of your home, and most industry estimates put the typical uplift at 10% to 25%, depending on the property, the area and the quality of the work. In London, where space is at a premium and every square metre is valuable, the uplift is often towards the upper end of that range.

Part of that value comes from the extra floor area: a loft conversion typically adds 15 to 35 square metres of usable space, which is often cheaper per square metre than extending outwards or moving.

What affects the uplift

• Where you are. The higher local property values are, the more a new bedroom or bathroom adds in pounds.
• The number of bedrooms. Going from a two-bedroom to a three-bedroom home moves it into a different bracket, which can matter more than the raw square metres.
• An en-suite. Adding a bathroom on the new floor is one of the strongest value drivers.
• The quality of the finish. A conversion that matches the rest of the house holds its value; a poor one can drag on a sale.
• Building regulations. A conversion with a completion certificate is far easier to sell than one without.

Loft conversion vs moving

Moving to a larger home in London means stamp duty, agent fees, legal fees and the cost of the move itself, often tens of thousands of pounds on top of the price difference. A loft conversion lets you gain the space you need without any of that, and without giving up your garden or your location.

Other ways to add value

• House extensions — a rear or side-return extension creates valuable open-plan space.
• A new kitchen or bathroom, which buyers value highly.
• Improving energy efficiency, which is increasingly reflected in valuations.

Frequently asked questions