Commissioner may require plan and other documents to be furnished.

1[(1)] At any time within thirty days after receipt of any notice under section 337, the Commissioner may, by written notice, require the person who has given the notice first therein before in this section mentioned, to furnish to the Commissioner all or any of the following documents, namely:—

2[(a) correct plans and sections of every floor of the building intended to be erected, which shall be drawn to a scale of not less than one inch to every eight feet and shall show the position, from, dimension and means of ventilation of and of access to the several parts of such building and its appurtenances

3[and the particular part or parts thereof which are, and those which are not, intended to be used for human habitation] and in the case of a building intended to be used as a dwelling-house for two or more families or for carrying on any trade or business in which a number of people exceeding twenty may be employed are as a place of public resort, the means of ingress and egress. Such plans and section shall also show the depth and nature of the foundations and the proposed dimension of all the walls, posts, columns, beams, joints and all girders and scantling to be used in the walls, staircases, floors, and roofs of such building;]

4[(b) a specification of each description of work proposed to be executed and of the materials to be employed. Such specification shall include a description of the proposed method of drainage of the building intended to be erected and of the sanitary fitting to be used and also of the means of water-supply and shall, if required by the Commissioner, be supplemented by detailed calculations showing the sufficiency of the strength of any part of such building;]

1. (c) a block plan of such building which shall be drawn to 5[the scale of the largest revenue survey map at the time being in existence for the locality in which the building is, or is to be situated] and shall show the position and appurtenances of the properties, if any, immediately adjoining the width and level of the street, if any in front of and the street, if any, at the rear of such building, the levels of the foundations and lowest floor or such building and of any yard or ground belonging thereto 6[and the means of access to such building];
2. (d) a plan showing the intended line of drainage of such building, and the intended size, depth and inclination of each drain, and the details of the arrangement proposed for the ventilation of the drains. 7[(2) At any time within the said period the Commissioner may also by the written notice require the said person to open for inspection any portion or portions of the intended foundations or any portion or portions of the foundation or walls of the existing building.]