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Everything You Need To Know About Adding A Garage Extension

Are you wondering how to increase the value of your home and give yourself some extra space too? Building a garage extension could be ideal for you and your family.

As far as home renovations go, it is one of the least disruptive projects and can be adapted to suit any budget. If you are worried about the price, this blog will show you the value of adding a garage and the steps involved along the way.

Why add a garage extension to your house?

Are you on the fence when it comes to adding a garage extension to your home, or does the promise of extra space without having to move sound like a dream come true? A garage extension is a renovation project that you won’t regret.  The value of adding a garage isn’t just financial – you get the extra room you dream about without the hassle of moving home – what’s not love?

If you’ve got all the space you need inside, what about outside? Not having a parking space when you get home is a pet peeve for many car owners, especially when it’s raining and you have a boot full of shopping! Car theft and vandalism is also commonplace in many neighbourhoods, so a garage is the best place to store your car at night to keep it safe.

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A garage doesn’t just need to be used for cars and home bric-a-brac either – how does a home gym sound? Or even a dedicated games room to keep your kids from cluttering the house with their toys – the possibilities are endless. 

Add value to your home

Building a garage extension doesn’t just give you the freedom and security of additional space, it will also add value to your house. With parking spaces and garage spaces at a premium, the value of a garage extension will be a major selling point to prospective buyers. Valuations estimate garage extensions as contributing upwards of £11,000 or more to total house prices.

How much does it cost to add a garage extension?

So, you’re no longer wondering why you should add a garage to your house, but how much it will cost. The good news? This is a project that can be tailored to fit almost any budget within reason.

The cost of adding a garage depends on the type of extension and the materials you choose. There are three main types of garage extension – detached (built separately from your home), attached (connected to your house) or integrated (sharing the same roof). 

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If you are building a detached garage be mindful of any extra charges involved in the form of planning permissions. If your house is a registered building or protected in any other way securing permission could be even more difficult and costly. 

The complexity of the design will affect the cost of adding a garage: a simple attached design typically costs around £4000-£5000 including labour and materials. If your grand design involves a large, multistorey detached building however then the costs are likely to double.

In some cases, you may need to find different tradespeople to get the job finished which will mean finding a plumber and electrician to complete the build. Costs for this additional work will vary from person to person so doing your homework will really pay off.

Don’t forget to budget for the cost of hiring a skip and disposal of waste once the project is finished too. This usually starts around the £150 mark for a week’s skip hire with disposal included.

How to add a garage extension to your home

It can seem daunting to take on a large home renovation project at first but adding a garage extension to your home can be easily done with the right planning and preparation. 

The Budget

Calculating your budget (and sticking to it) is the main thing you want to get right when building a garage extension. Your budget will determine the size of the extension, the quality of the materials you can use and which tradesmen you can work with. You will need to plan your budget precisely and make sure it’s realistic – failure to stick to budgets could mean you can’t afford to finish your garage extension, and nobody wants a half-finished garage! 

Get Quotes

Once you’ve planned your budget, it’s time to collect quotes from different companies and tradesmen. Experts advise you to collect at least three quotes to give you a good idea of the rates you can expect to pay. Being honest about your budget and being realistic with your expectations will go a long way in helping you find the right tradesman. 

The Build

The first part of adding a garage extension is always laying the foundations. This means digging a hole following the dimensions of the plan and then filling it with concrete. A stable foundation is important for ensuring the quality of your garage extension – it will support the rest of the build and prevent leaks or damp from the ground below. 

After the foundation has been laid its time for the rest of the garage to be constructed. Depending on your budget and the type of extension chosen, the rest of the construction will be made from brickwork or prefabricated walls. 

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Once the walls have been built, on goes the roof and the structure is complete. This step will vary depending on the type of roof: some styles will need extra timber supports and some can simply be screwed into place (corrugated sheets are great for this) 

Finally, the main structure is complete, and you can get to work installing the electrical and plumbing systems. After this, its down to the finishing touches so you can decorate with your favourite colours and accessories. 


If you are building a garage extension to store your car or other belongings, it’s wise to invest in a good security system. Adding an alarm and CCTV system will give you extra security and deter any would-be thieves. Are you ready to start planning your new garage extension? Our friendly team of experts are on hand to give you all the advice you need when it comes to planning and sticking to your budget.

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