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House Extensions - Lets Look At The Cost
Tom Norris

I’ve been getting asked far too frequently about how much an extension should cost without having all the necessary information to be able to come up with an accurate figure. There are so many variables to contend with that the average extension price could easily vary by as much as a 100%.

Based on the amount of enquiries we see for house extensions we place the average size of an extension at 3mt deep x 5mt wide with a cost of around. 35k. That would give you a square metre cost of 2,333 but this figure can change rapidly depending on the location and the specification.

Location is the big factor as the same extension on a London terrace could set you back 60k whilst doing the same kind of build on a cottage in Wales might set you back as little as 25k.

When it comes to one of the most expensive elements which is the roof I can tell you that whilst a pitched roof will clearly cost more than a flat roof, the situation get reversed if you add a roof lantern into the design of the flat roof.

When it comes to the walls, blockwork and rendering will only set you back around half the cost of building with a brick outer skin. Of course there are many cases where home-owners construct the side walls in block and only use brickwork to the end wall and this makes it virtually impossible to come up with an accurate cost for the walls without knowing all the details.

Other factors that significantly influence costs is whether there are old buildings to be demolished prior to building, ground levels that are too high or too low, amount of drainage works, site access and the amount of structural works required to open up the extension to the main house.

These variables above only refer to the build but what about the finishing materials? Marble, granite or limestone flooring will set you back 100 plus a metre whilst ceramic tiles will only cost about 20% of that price.

When it comes to the double glazing there is no set price either. A pair of double glazed quality French Doors from Everest could set you back 3k but if you went to B&Q you could probably pick up what you believe to be a similar product for around 1k.

What it comes down to is that it’s impossible to come up with an accurate cost of an extension without all the relevant details so if you really wish to get accurate extension costs you have no option but to place an enquiry with us and we will get local companies to review your project and submit accurate prices.

If you’re currently considering adding a house extension there are a number of further considerations below that you should pay attention to and in doing so you will be well rewarded.

Are You Going To Move House In The Next 5 Years?

House Extension Photos 2It’s an absolute fact that people spend many thousands of pounds adding an extension and doing up their property only to sell within a couple of years. Now the question is, if you knew you were going to move house would you really have:

Well unless you happen to be an architect or interior designer with a finger placed firmly on the current interior design trends then it’s most likely that you will have:

The truth is that many home-owners browse a few websites, read a few magazines and before you know it are off giving instructions to the builders without any real idea if the proposed works will:

Get it into your head that not all home improvements add value. Also, get it into your head that should you decide to spend 100 per metre on limestone flooring or 15k on a kitchen you could have wasted up to 75% of your money as you may not get it back when you sell.

House Extension Photos 3Different styles of properties require different designs when it comes to extending or refurbishing. Just because your large corner settee looked great in your open plan loft apartment doesn’t mean it will look well in a 3 bedroom 1930’s semi.

In effect, what I’m saying is that any kind of major refurbishment, layout change or addition should be carried out with the following considerations.

Budget - Am I refurbishing to sell or to keep? It’s an important consideration here as many home-owners waste many thousands of pounds on home improvements that they can’t possibly recoup when they sell.

Let’s say you had 2 properties. Property 1 had a value of 125k and property 2 had a value of 250k. Now would you really spend the same amount on a new kitchen or double glazing on each property? The answer is that you can but you would be losing money as the value and the location of the property needs to be considered when it comes to major refurbishments.

Design - Would you really add the same style of extension to 2 different properties? Just because you added an extension to one property and it worked really well, don’t go thinking that you will automatically get the same result on another property.

Each property is unique when it comes to designing the perfect home and as such deserves unique consideration rather than a standard bolt-on extension approach.

Interior Design - When it comes to creating new layouts and choosing finishing materials it’s absolutely essential that you do the research to establish what works best with your particular style of property. Bear in mind that at this point you should know if you’re refurbishing to sell within a few years or refurbishing to suit your own taste regardless.

We always advise getting in some specialist help to aid your decision making on whether a loft conversion is worth the effort, whether you should add a conservatory or in fact carry out any major improvements. Talk to your local estate agents if you want to find out if your proposal will add value, make the property more sellable or simply be a waste of money.

Architect - When it comes to layout changes, major refurbishments, extensions or conversions you should always engage the services of a local architect as the first step rather than calling the builders. In many cases builders tend to adopt particular styles and if given an opportunity they will be more than happy to steer you into a design and style that they like rather than a design that works best for your property and circumstance.

You also need to bear in mind that regardless of whether or not your proposals fall within permitted development you will still need drawings for building regulations approval and by drawings I mean technical drawings with sound arguments and calculations for energy saving especially if your design has a lot of glass.

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