Window installation methods: retrofit, full frame replacement and more

Retrofit installation into the existing frame

The old outer frame, fixed into the wall, stays in place. It is checked, then the new window is fitted inside it and the joints are covered with trims.

• Pros: quick, clean, little finishing work, no damage to the walls.
• Cons: slightly less glass area, and the old frame must be sound.

Full frame replacement

The old window is removed completely, outer frame included. The new window is fitted directly into the masonry, with new airtight seals.

• Pros: better insulation, more light, completely new seals.
• Cons: more finishing work around the window.

Fitting on the inner face, in the reveal or in a check reveal

These terms describe where the window sits in the wall, mainly in new builds or major renovations:

• On the inner face: the window is fixed against the inside face of the wall, ideal with internal insulation.
• In the reveal: the window sits within the thickness of the wall, between the two faces.
• In a check reveal: the window rests against a rebate built into the wall for that purpose.

How to choose

During the free measurement visit, we check the condition of the old frames, the thickness of the walls and the insulation. We then recommend the right method, set out in the quote. See also our window replacement page.