How Much Do Extensions Cost?

Need more space?


It’s safe to say that the year 2020 was a very strange one indeed. Not only did we live through a global pandemic, we also saw 2020 become the year of DIY. As a result of the numerous lockdowns, many of us were forced to spend all of our time at home and away from the office. This saw an immediate rise of home improvement projects and nationwide material shortages, and the trend doesn’t appear to be dying out anytime soon. 


The Government has released its plans for the UK to get back to ‘normal’, but this could be a slow transition and there are no guarantees that their ‘roadmap’ to ease restrictions is the be all and end all of lockdown.


We must accept that this could very well be our ‘new normal’, at least for the foreseeable future, and with that comes the question of working from home. More and more companies are taking the decision to put their employees on part time office work, while others have taken the stance that working remotely full time from home is the way forward.


This has caused many homeowners to convert rooms into office spaces and even extend their homes to accommodate this change in lifestyle. You may think that this is extreme, but extending your home could be the smartest decision you’ve ever made!



But let’s take a look at this closer. 


If you’re stuck for room, expanding your home will give you more space. Need an office? Build one. It really is that simple. 


Yes, you could move. However, you would more than likely need to spend time and money fixing things around your home to get it up to scratch to sell. Even then, there is no guarantee that it will sell and you’ve just spent money that could have gone into making your dream home. The stress of finding a new home, dealing with solicitors and movers is also another reason why you could just improve on what you already have.


Extensions can also add value to your home, so the money you put in is money that you could get back if you ever decided to move in the future. You can also tailor your extension to suit your needs. For example, you could have a single or double extension that creates an extra bedroom, larger kitchen with a pantry or laundry room, orangery or conservatory. The options are endless!


But what are the costs for such a build?



Surprisingly, not as much as you might think!


On average, a single storey extension costs around £2000 to £2500 per m2, depending on your requirements. This is calculated by taking the width of the proposed, timesed by the projection of the proposed building. 


Let’s say that you want a single storey, rear extension on your detached property and you have approved permitted development rights in place, and no need for planning permission. You can extend up to 4 metres from your original property, and the width of your extension is 8 metres. The cost for this will be in the region of £64,000 – £80,000.


A double storey extension at around £3,500 – £4,000 per m2, could be somewhere between £112,000 – £128,000. However, this is subject to change, as major structural changes to your property need to be taken into account. 


There are ways that you can keep the costs of your build down. If you have construction knowledge and are willing to take on a self-build, you could potentially save yourself between 10 – 20% of the cost.


Another way to manage the cost of your build is to implement good structural design. At Plans 2 Extend, this is what we do best! We have many years of experience in helping hundreds of people achieve the home of their dreams. For a free consultation, visit our website


For information relating to planning permission, take a look at our helpful article Can I Extend Without Planning Permission? 

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