Hi.

I need to replace a "porch" on an early 70s house.

House is detached, porch and garage are both attached to one side and share a flat roof. The porch extends 4' beyond the outer leaf of the house and is 5-6' wide. Door + thin board panel on the main shallow face, long face is glazed at top and had lower glazed half replaced with similar panel a long time ago. Final shallow face is into the garage. Frames are timber, glass single glazed, door a bog standard XL type timber, under a boxed dropped ceiling. All of this rests on 3 courses of brick. The mortar is worn out and/or missing on the bricks and frankly many of the bricks I think need replacing.

New porch will be the same layout but current materials. So refresh the bricks and sit either a composite or proper solid wood door sufficient for part L + DG on top. All of which will obviously be considerably heavier than the current porch.

So the foundation. Or lack of. Where the concrete of the drive doesn't quite meet up with the brickwork it is clear that underneath those bricks are simply grey blocks. I can't be sure what type of block but they follow a different line than the line of the bricks and aren't mortared to the bricks.

To carry the weight of the new porch what sort of foundation would I need, either legally or technically please?

Any advice appreciated