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Extensions

How do I know whether the foundations to my garage would support a second floor extension?

Anonymous user 03/03/2024 - 3.03 PM

Hi, We are thinking about extending over our garage (double length). The extension would extend the bathroom and rear bedroom. There are other houses in our street that have a similar extension, but it appears that none of the houses have a full side extension from front to rear. Instead the extensions start around 3 metres from the garage and extend to the rear of the property. I have read that some authorities were trying to stop the apprearance of "terracing" which could be why their extensions have been set back. My main question is how do I know whether the foundations to my garage would support a second floor extension, or do I assume that because other people have done it my foundations would be the same as theirs? Also, it might be worth mentioning that our garage has been converted to a kitchen/diner. Thanks Alex

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2 Answers

Brayfield Construction & Interiors Ltd

Rating: 4.8 out of 5
Bury St Edmunds
Do not assume your foundations are adequate - this could prove very costly later. If you are building over an existing structure you will be required to expose the existing foundations to enable the Building Control Officer (BCO) to inspect and assess if they are suitable for the additional load, this is all part of the building control process. It is quite a simple exercise of choosing a suitable spot and digging (normally by hand) a big enough trial pit along side the side of the existing building equal to the depth of the foundations , the BCO will then visit site and confirm or advise otherwise. I always advise clients to do this as early as possible rather than leaving it until the works have started as it is better to know what your dealing with from the beginning. Regards David
Answered30 November 2013
26

R.Hughes Building and Conservation Ltd

Rating: 5 out of 5
Wellingborough
Hi. You would need to dig a test hole to see how deep they are, you would need a minimum of 1m to do what you are planning. Assumptions are not acceptable to building control, they need solid evidence in the form of concrete!!! Regards, Rick
Answered30 November 2013
20