In a semi detached house, porches are adjacent on the boundary line but sit flush with the house. We have individual guttering over our porches that connect to a shared downpipe.
Our neighbours have built a porch extension that extends out the front of the house. We were of the understanding that the shared down pipe that was previously between our two properties would be put back as was and they would manage their guttering to the front of their new porch (see picture with purple marking) However the step they built yesterday in front of their new porch extends the width of the new porch so there is now nowhere for their new downpipe to go.
We talked to the builder yesterday (with the owner present) and he says they aren't replacing the shared downpipe against the wall of the property but are going to bring the guttering across the side of the porch and put their porch guttering round to the side and down into the ground. (see picture with red marking)
They left 50mm from the edge of the porch to the boundary line. This isn’t shared guttering and it is not something we are happy with. Our party wall agreement says all guttering etc should be on their side of the boundary.
We have asked this to be fixed as soon as possible as they haven’t maintained the downpipe throughout the works and although it fortunately has been very dry until lately the rain is now starting to ingress into our porch by the cables that come through at the bottom.
We would also like to understand if downpipes can go directly into the ground without a gully/drain – as there is certainly no room for this.
TIA