Try our Renovation Calculator: how much value can a house extension add?

A home extension is a great way to transform and improve the layout of a property. Projects like converting a loft to add an extra bedroom, or even adding a whole new floor, change the way you can use your home, while also adding value.

Whether you’re planning a house extension or conversion, or you’ve already completed one, our Renovation Calculator can help you explore the potential added value from these types of major improvement works.

How our Renovation Calculator works

We use leading sold house price insights and renovation uplift data for the local area to calculate an estimate of how much value an extension or conversion might add to a property.

When you’ve requested an Instant Valuation for a home, you can use our Renovation Calculator to show the potential added value of extending the square footage of your home with any of the major renovation projects below:

• Loft conversion
• Garage conversion
• Basement conversion
• Conservatory
• Barn conversion
• Side and/or rear extensions:
  • Single-storey extension
  • Two-storey extension
  • First-floor extension

You can use our Renovation Calculator when you request an Instant Valuation, which gives you an estimate of a property’s value ahead of a more comprehensive agent valuation.

Each month, the estimate is refreshed, so you‘ll be able to see if a home’s value has changed over time. You can also see how much properties nearby have recently sold for, and get useful information and insights about the local area to help you decide when could be the right time for you to move.

How to get an Instant Valuation for a home

Here’s how an Instant Valuation works:

• Enter a postcode, then select an address.
• Click ‘sign in’ for your instant online estimate.
• The estimate will auto-refresh each month.
• Your tracked property will also be saved in My Rightmove for whenever you need it.
• Try our Renovation Calculator to instantly see the value extensions and conversions could add to a home.

Get an Instant Valuation and try our Renovation Calculator

Our property expert Tim Bannister says: “We know many home-movers and home-owners using our Instant Valuation tool want to be able to factor in significant renovation works they’re planning, or have carried out since buying a home. Our Renovation Calculator helps to provide an initial estimate of the value major extensions and conversions can add, ahead of an expert in-person valuation from an agent.”

When you decide you’re ready to put your home on the market, you can arrange a free, no-obligation expert valuation with a local estate agent.

An in-person valuation allows an estate agent to see the property’s condition first-hand, and to get a feel for the space and size of the rooms. An expert agent valuation will help you to set the right asking price for your property and local area and confirm how much you can afford when you’re planning your next move.

Read more: Find out how much a home is worth