Foundation Questions

[Candyman21]

Hi All,

i know this has been asked a thousand times before, but my eyes have gone square reading different threads with different answers!

I have a couple of projects i want to get started and need help with foundations and depths, i know this will depend on soil type, if its anything like the front of my house it will be a lot of clay!

My 1st project is a conservatory, this i have planning for, it will be 3.5, wide and 4m long. Dwarf walls will be around 600m high the rest will be UPVC. Double skin walls with insulation. No trees anywhere to be seen, will be going along side my neighbours current conservatory.

How wide and deep would you suggest digging for this? Also how deep would you pour the concrete to?

My 2nd project will be a man cave/summerhouse at the bottom of my garden, this will be about 5m long and 3.5m wide. This will be a double skinned wall again with an insulated cavity, this will be no more than 2.5m high as this will be built under permitted development. This will be going at the bottom of my garden with no trees of any size within 10 meters.

How wide and deep would you suggest digging for this? Also how deep would you pour the concrete to?

Thanks All

John

 

[^woody^]

As deep as the house foundations, twice as wide as the wall, 75mm below ground level.

 

[Candyman21]

Thanks Woody,

Is is generally cheaper to trench fill as oppose to bring up to level with Blocks and engineering bricks?

 

[noseall]

Is is generally cheaper to trench fill as oppose to bring up to level with Blocks and engineering bricks?

Yes.