On this page
Costs and included work
For window installation subframes, compare the scope first: measurement, frames, glazing, fixings and surrounding finishes. A price is useful only when supply and finishing work are clearly defined.
| Work / price basis | Starting indication | Scope |
|---|---|---|
| Window installation subframes | Price on request | Measurement, frames, glazing, fixings and surrounding finishes |
What affects your total?
A subframe is an installation component, not a complete glazed window; dimensions, sealing and junctions determine supply. Fixed panes, tilt-and-turn windows, doors and sliding doors differ in hardware and installation. Specify removal, disposal, glazing, ventilation, sills and interior and exterior making good.
What to send with your request
Send width and height of each opening, photos, preferred materials and opening direction. Include your postcode, preferred schedule and the elements that must remain, so the scope can be assessed.
Assess the opening
Dimensions, surrounding masonry or timber and the intended fixing method need to be established before ordering. A subframe should form part of a designed junction rather than compensate for an unassessed opening.
Coordinate performance
The frame, fixings, insulation and airtight or weatherproof connections must work together. Ask for the complete installation detail, including the interior and exterior finish.
Materials and condition
The chosen material needs to suit the system and exposure. When replacing windows, inspect existing subframes before deciding to retain them. Concealed deterioration may change the repair scope.
Include it in the quote
Clarify whether removal, a new subframe, fixings, sealing and reinstatement are included. Compare complete installed frames so an omitted subframe does not become an unexpected additional cost.
Related information
Frequently asked questions
What is the difference between a subframe and the finished window frame?
The subframe provides the prepared junction in the façade opening to which the final frame is fitted. The visible frame holds items such as windows or doors. The material and junction design must suit the chosen frame system.
Does every replacement window need a subframe?
That depends on the frame system and the existing façade. Ask the supplier and installer to specify fixing and airtight and weatherproof junctions. Do not copy a detail from another property without assessment.
Who measures the opening for the subframe?
Agree who is responsible for final measurements and coordination with the frame supplier. Approximate dimensions help with an initial discussion, but production and installation require checked measurements.