A window brief is the short document that keeps a project from becoming a string of guesses. It gives a designer, fabricator and installer the same starting point before anyone prices a frame. A good brief does not need polished drawings. It needs the information that changes the specification.
Describe the building before the product
Start with the project location, building type and stage of work. A coastal apartment, a shaded renovation and a high-rise terrace place different demands on a window. Note the orientation of each opening, the exposure to wind and rain, the expected indoor temperature and whether the building has unusual humidity from a pool, kitchen or bathroom.
Include photographs of the existing wall and the route from delivery point to opening. A beautiful product can become an expensive problem if a large frame cannot pass through the stairwell or if the lift cannot carry the glass unit.
List every opening in a simple schedule
Give each opening a reference such as W-01 or D-03. Record the clear structural opening, the intended frame size, sill height, floor level and whether the item is fixed, hinged, sliding or folding. Mark handing and swing direction on a plan. If dimensions are provisional, label them as provisional; false precision causes more rework than an honest range.
- Opening reference and room
- Width, height and finished floor level
- Operation, handing and hardware position
- Threshold type and accessibility requirement
- External shading, blinds or screens
- Drainage route and waterproofing connection
Turn comfort goals into measurable questions
“Quiet” and “energy efficient” are useful goals, but they need a follow-up question. For noise, describe the source, time of day and whether low-frequency traffic is involved. For solar control, note orientation, shading and whether the room should keep winter sun. For comfort, ask for whole-window Uw, air permeability, water tightness and wind-load information where relevant. The correct metric depends on the project; do not copy a number from a different frame size.
Choose glass and finish with the context
State whether the brief needs safety glass, laminated acoustic glass, solar-control coating, privacy, low reflection or a particular colour rendering. Glass changes weight, thickness and edge detail, so the choice belongs in the brief before hardware is finalised. For finishes, describe the surrounding materials and exposure. A colour chip viewed indoors can look different on a sunlit elevation; ask for a physical sample when the tone matters.
Include the installation handover
Decide who is responsible for survey, protection, flashing, perimeter sealing, adjustment and final cleaning. Add a hold point for checking frame size against the surveyed opening before fabrication. Record what the installer must return: photographs of concealed membranes, adjustment records, care instructions and warranty documents.
Questions to settle before requesting a quote
What if the sizes are not final?
Issue the schedule as “for budget” and set a separate measured-survey date. Do not let a budget size become a production size by accident.
How much detail is enough?
Enough to expose decisions that change price, performance or installation. A one-page opening schedule plus a short performance and finish brief is usually more useful than a long generic specification.
Use the solutions overview to frame the opening type, then send the schedule through our contact page so the next conversation starts with project facts.
Prepared by the joycham Windows + Doors editorial team. Specifications and performance outcomes vary by opening, glass, hardware and installation; confirm project-specific values before ordering.
