Internal windows and borrowed light in Greater London
From London outwards, we design and install internal windows and borrowed light in Greater London. Tell us about the opening and we'll arrange a survey at a time that suits you.
- Free survey anywhere in Greater London
- Fixed written price before anything is ordered
- £450–£800 per m² plus VAT, fitted (guide)
Free survey in Greater London
Tell us about the space. We'll call back within one working day to book a survey.
About internal windows and borrowed light
An internal window is a fixed glazed panel set into an internal wall to borrow daylight from a bright room for a dark one — an inner hallway, a landing, a windowless bathroom or a box room. A glazed fanlight over a door does the same job. Full details on internal windows and borrowed light.
Internal windows and borrowed light for Greater London properties
Much of what we fit in Greater London goes into Victorian and Edwardian terraces, mansion flats, warehouse conversions and new-build apartments. The survey is where we spot the things that change a price — a sloping floor, a hidden pipe, a wall that needs a lintel — so there are no surprises later. On the commercial side, much of our Greater London work involves one of Europe's largest office markets, from City towers to Shoreditch studios and suburban business parks.
Cost and lead time in Greater London
Guide pricing for internal windows and borrowed light in Greater London is £450–£800 per m² plus VAT, including fitting — small jobs start from about £450. We cover every E, EC, N, NW, SE, SW, W, WC, CR, BR, HA, TW, KT postcode in Greater London. Once you approve the drawing, lead time is typically 3–5 weeks from survey.
Building Regulations and safety
Glass within 800mm of the floor must be safety glass. Cutting into a masonry wall may need a lintel and, if the wall is load-bearing, structural calculations; stud walls are usually straightforward.
Questions from Greater London customers
Do you fit internal windows and borrowed light in Westminster?
Yes. We cover Westminster and the rest of Greater London, including Westminster, Camden, Islington. Surveys are free and there's no obligation.
How much do internal windows and borrowed light cost in Greater London?
As a guide, £450–£800 per m² plus VAT, supplied and fitted, with the fixed price confirmed after a free survey.
Does an internal window need Building Regulations approval?
Usually not on its own, but forming an opening in a load-bearing wall needs a lintel and Building Control sign-off. Glass near the floor must be safety glass.
Ready to see what glass could do for your space?
Book a free survey or get an instant guide price online. No obligation, and your quote is fixed in writing.