Looking at the photos it appears the neighbour has built a parapet wall on or just inside their property boundary.
Parapet vs boundry wall gutter.
Having the correct parapet and boundary wall flow capacity is more critical than with an eaves gutter so calculating the flow rates accurately is essential.
These days it is rare to obtain planning permission to build right up to the boundary so in most cases the offending gutters and so on have probably been in place for some while.
The masonry parapet the thing to note here is that the concrete deck is the air control layer so an additional one is not necessary.
Parapet and boundary wall design.
I would of course if feasible.
Parapet or gutter along boundary wall.
Dshall i ve previously tried to alter the roofline using the methods you suggested.
Aluminium parapet and boundary wall non branded gutters are manufactured to suit each build and designed specifically to meet your individual project requirements.
The balloon framed steel stud parapet this is the ugliest parapet to get right.
Conversely the land registry practice guide 40 supplement 3 sets out the legal presumption that a property includes any projections over or under the boundary.
Quick one small bit of a situation between architect builder and myself.
1 5 x building design life 4 5 x building design life.
In these situations the gutter for this part of the roof has to be located on top of the wall.
Special profile parapet and boundary wall gutters can be fabricated or pressed.
Notice the use.
Wall being built and builder asked would i prefer gutter out of consideration to neighbour s conservatory.
However joints in the concrete deck need to be addressed for air control layer continuity.
Properly built no part of the building should extend across the boundary line.
These flow rates can be calculated by our designers so please contact our technical department if you would like assistance.
For a building of say a design life of 30 years this would give a return period of 45 years and 135 years respectively.
Unfortunately our local planning laws don t allow any part of the building to extend over a wall built on the boundary.
The guttering should be installed on top of special flashing that sits above the brick wall so it s within the property.
Kitchen extension designed with a parapet on the adjoining neighbour s side.