37 Preparatory services for construction or assembly of buildings, namely, services in the nature of demolition of houses and buildings, construction site cleaning, excavation services, and demolition blasting of rocks in site; site preparation, namely, installing fencing, planning and laying out of residential communities, and foundation contractor services; site drainage, namely, drainage pipe installation; site drilling, namely, metal drilling and perforation; site leveling, namely, excavation services; installation of siding; services of assembling of housing units, namely, steel structure construction works and installation of frames, roofs, facades and walls; installation of building insulation; services for construction or assembly, namely, masonry, installing floor tile, roofing, and carpentry; mounting of facades on buildings; building construction services, namely, mounting of construction elements, namely, frames for buildings, roofs and walls; painting; mounting of wall coverings, namely, wallpapering services; installing floor covering, namely, floors made of organic and inorganic materials, namely, PVC, ceramics, stone and polyester; mounting of glass and mirrors, namely, installation of glass and mirrors; steam cleaning, namely, steaming of facades, roofs and carpet cleaning; sanding of build floor surfaces, namely, floor sanding; cleaning of building exterior surfaces; construction services, namely, planning, laying out and custom construction of residential and commercial communities