Cross references—Fire prevention and protection, Ch. 11; erection of buildings, extension of public utility services in parks restricted, § 18-81; sewers, sewage disposal and drains, Ch. 22; numbering of buildings, § 23-21 et seq.; installations in streets and sidewalks, § 23-140 et seq.; building department to enforce trailer regulations, § 29-4; underground utilities, Ch. 30.