Extension Builder Belfast

Unlock your home’s full potential

Transform your home with a beautiful extension that maximises space, tailors your home to your needs, and boosts your property’s value.

Call us now for your free quote.

Avoid These Headaches

    Extended disruption to your life as your builder misses deadline after deadline.


    Your builder doesn’t show up every day, while you’re stuck in the house without a functioning kitchen.


    Your builder hasn’t bothered to install temporary protection to secure your home and shield it from wind and rain damage.

We firmly believe you should never have to deal with easily avoidable issues during your extension build…

We’re dedicated to delivering construction excellence without the headaches

We understand how important it is that we complete your project to the highest quality and in the shortest timeframe possible.

We’ll be there every single day, working to the agreed schedule, until the job is done.


We’re dedicated to perfection and committed to competitive pricing.

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What You Can Expect When We Build Your Home Extension


    15-Year Warranty

    We stand over our work with our benchmark 15-year warranty. This combined with our extended post-construction support gives you confidence that your investment is safeguarded for years to come.


    Transparent Pricing

    Our fully itemised quotes give you cost-certainty from the outset of your project. This prevents unwanted surprises from arising during your build, and allows you to confidently budget for the project.


    Always Contactable

    Our commitment to open communication ensures that you can reach us with ease. If we’re unavailable, we’ll return your call within 1 hour. Guaranteed!

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Our C4 Strategy: Contact to Completion

Our tried and tested system

Home Extension Building Experts

Here’s what you’ll get

5-Star Extension Builders In Belfast

What Our Customers Say

“Superb communication, very professional.”

“I can’t recommend these guys enough. Having had a few bad experiences with tradesmen in the past, we were anxious about finding someone to do our extension. Very reasonably priced and done everything as and when they said they would. They always kept us in the loop about the build and always answered their phone when we rang them. Superb communication, very professional and great workmanship.”

Micky Mc Veigh

“Very professional & great workmanship.”

“I hired Madden Contracts last August to build a bathroom extension. Niall was our main contact and let us know what the price and schedule would be. We are delighted with our new build. The workmanship was exemplary and the guys were punctual every morning. They were a great bunch of people to get to know. Niall, Michael, Sean etc. thanks very much.”

Paul Burns

“We are delighted with our new build.”

“The guys at Madden Contracts were absolutely brilliant. On time, hard working and honest contractors who produce quality results. Recently had a small extension done and I couldn’t be happier with the work.”

Michael Boyd

Frequently Asked Questions

If you have a question, don't hesitate to get in touch.

Can I live in my house during the build?

Yes, you can continue to live in your home while we build your extension. We will erect temporary structures to make sure your house stays warm and watertight during the build.

Do I need to deal with Building Control?

We will liaise with Building Control on your behalf, ensuring that inspections are booked and carried out at the right stages during the build.

Do I need planning permission?

You may need planning permission for your extension. Some simple extensions can be carried out under ‘permitted development’. Larger extensions often involve submitting a planning application to the planning office. We can advise you on all planning related matters and we can guide you through the planning process if you do need permission.

How long does it take to build an extension?

That depends on the size and complexity of the extension, and generally ranges between 3 – 6 months. We will provide you with a detailed timeline before work commences, so you will know exactly how long your project will last from the outset.

Do I need to find separate plumbers, electricians, plasterers, etc?

We will supply and manage all tradesmen required to complete your project. We will be your single point of contact throughout the build, and we will stand over all work completed by our various trades.

Do I get a warranty?

Yes, we stand over all of our extension work with a 15-year structural warranty, which is 50% longer than the industry standard.

Do I need to pay anything upfront?

No, you won’t pay a penny until our tradesmen arrive onsite.

Create the home you always dreamed of, call us today!

Get in touch for a free quote and experience our outstanding service.

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