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Last updated on March 25th, 2023

Utility room extension cost guide

Want to add a utility room to your house, or make an existing utility room larger? A utility room extension could help you create a dedicated space for those more ‘unsightly’ household jobs, such as cleaning and laundry.

In this guide, we’ll look at the average utility room extension cost, so you can plan your project.

Want to add a utility room to your house, or extend an existing utility room larger to make it larger? Building a utility room extension could help you create a dedicated space for those more ‘unsightly’ household jobs, such as cleaning and laundry.

You can use a larger utility room for essential storage. Or, as a ‘boot room’ for muddy shoes straight from the garden. Invest some time and money into a better utility room, and you’ll be able to keep the rest of your home pristine and clutter-free.

In this guide, we’ll look at the average utility room extension cost, so you can plan your project. Have you also thought about using your utility room to create a dog shower? Take a look at our dog shower cost guide to find out more.

How much does a utility room extension cost?

Cost provided itemLow costHigh costAverage cost
Extension cost per square metre£1,250£2,500£2,000
Storage furniture£100£350£225
Appliances (washer/dryer)£350£1,700£1,025

Our costs are ballpark averages – get a local tradesperson to quote now

How much does a utility room extension cost? It all depends on the size of the extension, as each extra square metre will add to the overall price. Your location could also be a factor, as building costs in London for example can be higher than in the rest of the country.

On average, building a single-storey utility room extension costs around £1,250 to £2,500 per square metre.

The cost to build a utility room extension includes:

  • Groundworks
  • Foundations
  • Walls
  • A roof
  • Door(s) and window(s)
  • Drainage
  • First fix electrics and plumbing
  • Plastered walls and ceiling
  • Flooring

Final finishes such as furniture, light fittings, switches, appliances, worktops, cupboards, decoration will all come at an additional cost.

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How much does a small utility room extension cost?

If you only need a little extra space for utilities and appliances, you can potentially save money by building a modest extension.

The minimum size for a usable utility room is around 1.8m x 2.4m, with a total floor space of around 4.3m square. To build a small utility room extension of this size onto your house could cost you around £6,880. This is before appliances and other extras.

Cost of appliances and furniture for a new utility room

As well as build costs for the utility room extension, you’ll also need to factor in the price of furniture, storage and appliances. How much you spend depends on what you’d like to use the room for. The quality and specifications of the units and appliances you choose will also affect the overall cost.

On average, you can expect to pay around £225 for storage furniture – an essential part of any utility room. You can buy a combined washer-dryer for £350 to £1,700.

You’ll also need to consider costs for plumbing and electrical work, along with the installation of sinks, taps, worktops or anything else you’d like in your new utility room.

Utility room extension cost calculator

Taking all of the above into account, the cost of a utility room extension will vary. Factors depend on how large of an extension you wish to make to the existing space, the quality and specification of the materials used in the build, and the appliances or fittings you choose.

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FAQs about Utility Room Extensions
building cost of utility room extension appliances

Where should I put my utility room extension?

The ideal place for a utility room extension is next to existing plumbing, water and heating supplies. This means any new fittings and fixtures will be easy to connect up.

Utility rooms next to kitchens are also very handy. If you have a side return, you could make good use of this otherwise wasted space by putting your utility room extension there.

How long does it take to build a utility room extension?

It depends on the size and complexity of the project, but on average single-storey extensions tend to take between three and six months to complete.

Do I need planning permission to extend my utility room?

Most utility room extensions (unless they’re very large) should fall under Permitted Development. This means you shouldn’t need to seek planning permission. However, you’ll still need to make sure your new extension meets all applicable building regulations.

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Working with professional estimators, we collate cost estimates for the common home improvement and repair jobs in the UK.

All the costs are estimates only. For accurate costs for your particular requirements, you are encouraged to reach out to professional tradespeople to receive a quote for your job.

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