Hi,
I'd like to just check something with experienced professionals.
We've had some works done to our house, extension and interior alterations. For this we made a planning application which was accepted. That work has all been completed and we are about to have the final inspection from Building Control to sign off the work. There's one bit of work we did that wasn't on the planning application and the inspector has not yet seen. I'm not quite sure if we need to bring it up with the inspector or not - we replaced the ground floor slab and slightly lowered our ground floor. The final floor level is now 100 mm lower than it was originally. My understanding is interior works on sub-floors do not need planning permission but I'm not sure if we need to discuss it with the building inspector.
For clarification, we dug out the sub-floor to remove the old and very poorly done concrete slab (some of the floor was just screed straight onto soil - no slab at all!). We did all this work ourselves, although our builder did offer his advice to make sure we didn't make any mistakes. Our sub floor in order from top to bottom:
Screed (with anticrack fibres) with UFH pipes (~75 mm thick)
Vapour membrane
Insulation border around exterior walls between screed and brickwork.
PIR boards (foil backed 100 mm), tightly taped together
Concrete slab with overlapping reinforced steel mesh (100 mm thick)
1200mm gauge polythene DPM lapped up the walls to the top of the screed
Sand blinding (50 mm) (wacked down with a wacker plate)
Hardcore (~100 mm) wacked down
In half of the house's footprint we hit the chalk bedrock, so the hardcore layer ranges from 0 - 100 mm. I didn't fancy trying to dig out the chalk.
When the inspector comes to sign off the other parts of the build that were in the original planning permission, do I need to bring up the lowering of our ground floor and rebuilding of the sub-floor and slab? If he doesn't ask about it I'd rather not discuss as I'm not a professional builder, we were a bit stingy with the hardcore thickness in places, and I don't have much in the way of proof of the work we did.
Any advice?
I'd like to just check something with experienced professionals.
We've had some works done to our house, extension and interior alterations. For this we made a planning application which was accepted. That work has all been completed and we are about to have the final inspection from Building Control to sign off the work. There's one bit of work we did that wasn't on the planning application and the inspector has not yet seen. I'm not quite sure if we need to bring it up with the inspector or not - we replaced the ground floor slab and slightly lowered our ground floor. The final floor level is now 100 mm lower than it was originally. My understanding is interior works on sub-floors do not need planning permission but I'm not sure if we need to discuss it with the building inspector.
For clarification, we dug out the sub-floor to remove the old and very poorly done concrete slab (some of the floor was just screed straight onto soil - no slab at all!). We did all this work ourselves, although our builder did offer his advice to make sure we didn't make any mistakes. Our sub floor in order from top to bottom:
Screed (with anticrack fibres) with UFH pipes (~75 mm thick)
Vapour membrane
Insulation border around exterior walls between screed and brickwork.
PIR boards (foil backed 100 mm), tightly taped together
Concrete slab with overlapping reinforced steel mesh (100 mm thick)
1200mm gauge polythene DPM lapped up the walls to the top of the screed
Sand blinding (50 mm) (wacked down with a wacker plate)
Hardcore (~100 mm) wacked down
In half of the house's footprint we hit the chalk bedrock, so the hardcore layer ranges from 0 - 100 mm. I didn't fancy trying to dig out the chalk.
When the inspector comes to sign off the other parts of the build that were in the original planning permission, do I need to bring up the lowering of our ground floor and rebuilding of the sub-floor and slab? If he doesn't ask about it I'd rather not discuss as I'm not a professional builder, we were a bit stingy with the hardcore thickness in places, and I don't have much in the way of proof of the work we did.
Any advice?
