Glazing Project Gallery London & Surrey | Windows & Doors | Window Fitters Ltd

Glazing Project Gallery and Site Workmanship

Browse completed window, entrance door, and architectural glazing projects installed by Window Fitters Ltd across Greater London, Surrey, and the South East. Our project gallery demonstrates our precision on-site fitting, laser-levelled frame alignment, clean perimeter silicone tooling, and full compliance with UK Building Regulations on residential extensions, period restorations, and commercial contracts.

Aluminium and Timber Patio Door Projects

Large-format folding and sliding door installations engineered for open-plan residential extensions, combining slim sightlines with step-free threshold access:

Period Sash Windows and Heritage Glazing Projects

Authentic timber and uPVC vertical sliding sashes for period townhouses alongside coordinated residential frontages:

Commercial Glazing, Fire Doors, and Facades

Subcontract glazing, commercial entrance screens, and certified fire door assemblies for main contractors and commercial developers:

Survey Tolerances and Structural Site Preparation

A successful glazing project relies on rigorous aperture surveying before fabrication:

• Three-point aperture measurement: Measuring width and height at top, middle, and bottom, taking the smallest dimension and deducting 10 mm for standard frames, or 15 mm on wide spans and dark powder-coated profiles (such as RAL 7016 Anthracite Grey) to accommodate summer thermal expansion.
• Diagonal squareness checks: Measuring corner-to-corner diagonals to ensure the aperture is true within 2 mm to 3 mm before setting outer frames.
• Load-bearing lintel condition: Checking structural support above openings in compliance with Approved Document A, ensuring proper steel or concrete lintel bearing before removing existing load-bearing frames.
• Sub-cill overhang and drainage: Sizing external sub-cills (150 mm to 180 mm projections) to shed rainwater clear of brickwork, render, or external wall insulation under Approved Document C. Review our technical survey process.

Glazing Geometry, Perimeter Insulation, and Handover

Precision on-site assembly ensures long-term operational reliability without dropped sashes or draughts:

• Toe-and-heel packing: Bracing opening door leaves and heavy casement sashes diagonally with load-bearing plastic bridge packers, transferring the glass weight back to the bottom hinge corner and preventing sash drop.
• Mechanical anchor spacing: Fixing outer frames 150 mm from corners and at maximum 600 mm intermediate centres into structural masonry using direct concrete fixings without distorting profile chambers.
• Three-tier perimeter sealing: Insulating frame-to-masonry gaps with low-expansion elastic polyurethane foam to eliminate cold bridging, followed by an internal airtight seal and external low-modulus neutral-cure silicone tooled over closed-cell backer rod.
• Final commissioning: Checking multi-point locking compression, testing trickle vent airflow under Approved Document F, cleaning glass units, and issuing compliance documentation. Read more in our fitting process guide.