Footings for another storey

Question

Hello, I have a single storey extension on the side of my house.  My Dad had the house before me and had the extension built, which the builder at the time, stated that the footings he did, would be strong enough, for another storey at a later date.

So how deep or wide would footings need to be for another story please?

Harry · Answer

Usually as standard practice in today's world building control ask for 1m+ in depth, 600mm wide squared off and would usually require test holes to be dug for inspection at a couple of points to evidence the depth. In the worse case a structural engineer would be best placed to design a solution should your footings be less than this.

Hope this helps!

Bakir · Answer

Hi 
The foundation for a double-story building requires a depth of 100cm and a width of 60cm

Peter · Answer

You need to know if the extension was carried out under building control regulations there  will be records of the job going back many years check with your local council if it was carried out under building regs every thing should be okay as it is not about the depth of the foundations regardless off single or double story all excuvations should go down to load building strata (natural solid groung) if thats not the case you will have a structual engineers report on the excuvations attached to the building regulations of the said property stating the load that can be applied to the footings
It would also be benificial to dig a test hole on the outside of the building to exspose the exsisting footing and ground conditions .
In some cases you will have to underpin the old footings to take the 2nd storey
hope this helps regards peter pal construction (nottm) ltd

Ola · Answer

The footings for double storey extension should  be 500 wide x 1mtr depth

Chris · Answer

Hi its normally 200mm  8 inches 
But also depends on nature of build    soil ect

Andy · Answer

This would all depend on surrounding trees an subsoil conditions, a test hole will need to be excavated and inspected by a competent person

Ian · Answer

Footings for Building Control Regulations should be 620mm wide and 1m deep plus depending on ground conditions and any trees or hedges in close proximity.  Regards Ian

Jim · Answer

Only way is to dig down and expose section of old footings get a inspection done from build control may after underpin old footings if not substantial enough to take another storey on them or a structural engineer

Doug · Answer

Hi building regulations have changed over the years you would need to have someone in to inspect and check if they would be acceptable.
There should be plans with the council that would say what was done originally and they would be available to you if you speak to your local planing office

Mason · Answer

The depth and width of footings required for an additional storey depend on a few factors, such as the type of soil, the weight of the new storey, and the existing foundation. Here's a general idea, but keep in mind that this should be verified by a structural engineer:

General Guidelines:
Depth: For typical soil conditions, footings for an additional storey might need to be around 1.2m to 1.5m (4-5 feet) deep, but this can vary depending on the soil type and load.
Width: Footings would usually need to be at least 450mm to 600mm (18-24 inches) wide. Wider footings can be necessary if the soil is poor or if the existing foundation is not adequate to support extra weight.
Considerations:
Soil Type: Clay, sand, and chalk require different footing depths. Clay soil, for instance, might need deeper footings to avoid movement.
Existing Foundation: If your current footings are not strong enough, they might need to be widened or underpinned to support the added weight.
Building Regulations: A structural engineer will need to assess your property and provide specific advice, especially since you’re considering adding another storey.
It’s always best to consult a structural engineer to ensure the current foundation is suitable for an additional storey.

Footings for another storey

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