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Hi. I understand that there is a minimum brickwork width of 780mm at external corners to openings (if cavity of 100mm) - but is there also a minimum distance stipulated for walls adjoining existing brickwork tied in with wall starter kits to openings? For additional info the wall is a non...

Hi I need to move my existing external toilet and bath outlets due to having a rear extension built and they foul the roofline. After advice / opinions on my preferred option which I have included as a sketch. My main concern is: 1, If I'll need air admittance valves and where they need to be...