Describe the problem first
Let the person preparing the specification know what you want to improve.
- Mention ventilation, cleaning access, rain exposure, dust, noise or heat concerns.
- Share photos of the existing opening and surrounding finishes.
- Say whether removal and making good are part of the requirement.
Compare the complete system
A uPVC or aluminium label alone does not establish how a specific installation will perform.
- Ask for the proposed frame/profile, glass and hardware specification.
- Discuss casement, sliding or fixed arrangements for each opening.
- Confirm mesh, handles, locking and safety requirements where relevant.
Settle measurements and access
Approximate sizes help an initial discussion; final supply needs checked dimensions.
- Confirm who measures and signs off each opening.
- Note floor level, access, lifting and society working restrictions.
- Clarify how the surrounding wall, sill and finishes will be handled.
Ask for evidence and terms
Any performance or warranty claim should relate to the actual product and scope.
- Request relevant product information for the proposed system.
- Distinguish product terms from installation/workmanship terms.
- Keep the final specification and after-sales contact with your quote.
Use this as a planning checklist. The actual product, dimensions and work are confirmed in your project specification.