Building Regulations (Northern Ireland) 2000

Rule D: Services and fittings

3.  Where it is proposed to execute works of drainage or to construct or install a water closet fitting, urinal fitting, cesspool, septic tank or similar structure (for the reception or disposal of foul water from buildings), a block plan. Such plan shall, if the work is in connection with an operation to which Rule B or C relates, be the block plan required by such rule and the block plan shall in any case show, so far as necessary to establish whether the proposals comply with all such requirements of these regulations as apply to them—

(a) the position of services or fittings;

(b) the lines of drainage; the size, depth and inclination of every drain and the means of access to be provided for the inspection and clearance of blockages;

(c) the position and level of the outfall of the drains; and

(d) where the drainage is intended to be connected to a sewer, the position of the sewer.