Find house extension builders near me

A home extension can completely change the way you live — more space, better flow, and the chance to shape your home around your lifestyle and needs.

Whether you’re adding a new kitchen-diner, creating a home office, or building upwards with an extra storey, the right builder will make all the difference.

That's where we come in. All our tradespeople are checked by us and reviewed by real customers, so for a commitment to quality and a job done right, search for house extension builders near you with Checkatrade. Here's how...

How to find house extension builders near you

1. Search your postcode

First, enter your postcode into the search tool to see the checked house extension builders who operate in your area.

2. Compare options

Then, view company profiles, read real customer reviews, and browse photos of completed projects to help shortlist the options that best match your needs.

3. Get in touch

All that's left to do is contact your chosen contractors to discuss your requirements and request quotes.

Find house extension builders near you with Checkatrade

Only tradespeople who pass our checks and commit to upholding the Checkatrade Standard appear in our listings. That means you can feel more confident when browsing and comparing options to find the help you need.

Enter your postcode below to discover the checked house extension builders who work in your area.

Find house extension builders in your area

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Find related services you may need

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Why not download the Checkatrade app, for all the tradespeople you need at your fingertips?

Why hire a house extension builder?

A home extension is a dream project for many homeowners. It can solve space-related challenges, is cheaper and less stressful than moving house, and can increase the value of your home.

Popular home extension projects in the UK include:

• Adding an extra bedroom or bathroom

• Creating a larger kitchen or living area

• Building a home office or utility room

Whatever your reason, a skilled extension builder can help turn your vision into a structurally sound, compliant, and well-finished space.

Your building project may require several different skills, but at Checkatrade, we've got you covered. Find checked and reviewed plumbers, electricians, plasterers, carpenters, and more, all in one handy place, all committed to quality and a job done right.

What does a house extension project involve?

Your chosen contractor will be able to guide you through the process of building an extension, but here's a brief outline of what you can expect:

• Site surveys and groundwork

• Structural work, including foundations, walls, and roofing

• Plumbing, electrics, and insulation

• Internal finishing and decoration

Depending on your plans, you may also need an architect or structural engineer to ensure your designs comply with Building Regulations.

For more detailed information, take a look at our house extension planning guide.

How much does a home extension cost?

As you might expect, the cost of building an extension will depend on several variables, including:

• The size and complexity of the extension

• The type of extension and its location

• The material costs

• Where you live in the UK

As a rough guide, the average cost of a 20m² extension is around £48,000.

And the expected return? A well-executed house extension can add 10-20% to your home’s overall value.

A quick note on quotes...

When choosing a contractor for your house extension, aim to get a selection of detailed quotes, and ask that they are broken down into labour, materials, and any extra costs (waste disposal, permits, fees etc).

This allows you to more easily compare prices and services like-for-like, helping you to choose the right option for your project.

Need a job estimate to help with budgeting?

Try our AI powered job estimate calculator

Questions to ask before hiring

A home extension is a major renovation project and a sizeable investment in your home. Before you commit, it’s worth asking your shortlisted contractors a few key questions:

• What similar projects have you completed recently?

• Can I see examples or photos of previous work?

• What’s included in your quote, and are there likely to be extra costs?

• How will you manage planning permission and building regulations?

• Do you have adequate and up-to-date public liability insurance?

• What’s your payment schedule? (Avoid paying the full cost upfront.)

Why use Checkatrade to find house extension builders near you?

• Checked - Every Checkatrade member must pass up to 12 checks and commit to upholding the Checkatrade Standard

• Reviewed - Over 6.2 million reviews have been published on Checkatrade

• Guaranteed - Jobs booked through Checkatrade are covered up to £1,000 - T&Cs apply

Request a quote, search in the Checkatrade app, or enter your postcode below to find house extension builders near you.

FAQs about house extension projects

Where do I start when planning an extension?

The first step in planning an extension is setting a budget and researching house extension builders in your area.

Use Checkatrade's free search function to find and contact checked contractors to discuss your requirements and request quotes.

Consider hiring an architect to refine your plans and ensure compliance with Building Regulations.

Do I need an architect for an extension?

You don't legally need an architect for a home extension, but hiring one can help with design, planning, and compliance, helping to navigate complex regulations.

They will also ensure your extension looks and acts the part — delivering the style and practicality you desire — within your designated budget.

How long does it take to build a house extension?

A small single-storey extension may take 8–12 weeks to build. Larger or two-storey builds can take several months, depending on complexity and the weather conditions.

Can I live in my home during an extension?

It's often possible to live in your home while your extension is being built, though there may be periods where water, heating, or electricity are out of action.

It's a good idea to discuss logistics and timelines with your builder early on to help minimise stress and disruption.

Do I need planning permission for an extension?

Some extensions fall under permitted development, but larger or taller builds usually need planning approval.

• Single-storey rear extensions can typically extend up to 6 metres (or 8 metres for detached homes) without permission

• You must get planning permission if your intended build will be higher than the highest part of the existing roof

• Single-storey rear extensions cannot extend beyond the back wall of the original house by more than four metres for a detached house, or more than three metres for a terraced or semi-detached house

• Single-storey extensions can’t exceed four metres in height without planning permission

• Side extensions cannot go beyond four metres in height, can only be one storey, and can only be up to half the width of your house

Always check with your local authority whether planning permission is needed before starting your project.

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