Windows and facade systems: pool the specification, not the labour
Good verdict; joins after pumps in his planned expansion sequence.
The range above is an indicative planning figure taken from our own research, not a quotation and not an offer. buytogethr is pre-launch and has closed no pools.
What you are actually buying
A facade order is an engineered assembly rather than a set of window units: profiles in aluminium, uPVC or steel, a glass make-up, hardware, gaskets and sealants, the anchoring back to the structure, and the installation, all designed against a wind load and a weather performance. Bids vary on the system profile and its structural design, glass thickness, lamination, insulation and coating, hardware make and cycle rating, whether a thermal break is present, and whether performance testing and the structural calculation are inside the scope and signed by someone. The habit that causes most trouble is buying by rate per square metre: two identical rates can carry different profiles, glass and anchoring, and the difference appears in the first monsoon.
Why windows / facade systems suits collective purchasing
Glass, profiles and hardware are commodity inputs that fabricators buy in, so a requirement gathered across several projects gives fabricators a volume none of them reaches alone, and lets a group impose one system specification and one testing regime instead of accepting whatever each supplier proposes. The limit is worth stating plainly: fabrication and installation are local, measured to each building, and do not aggregate. What pools is the system specification, the material supply and the performance standard, so expect the benefit to sit in the material line and in comparability rather than across the whole installed contract.
Pin down before price
- Design wind pressure for the location and building height, and who performs and signs the structural calculation
- Glass make-up: thickness, lamination or insulation, coating, and the toughening and heat soak requirement
- System profile, thermal break, and approved hardware makes with their cycle rating
- Performance testing regime for air, water and structural loading, and whether it is on a mock-up or in situ
- Anchoring details, sealant specification, and the interface with the civil structure
What drives ten-year cost
- Sealant and gasket renewal is the recurring maintenance line on any facade
- Hinges, friction stays and locks wear out, and the same hardware has to still be available
- Access and cleaning arrangements for the upper elevations, for the life of the building
- The effect of the chosen glass on cooling load, paid every year the building is occupied