Frame finish
Foiled colours or woodgrain finishes typically add 10–20% against standard white profiles.
Glazing specification
Laminated, acoustic, solar-control or decorative glazing can add £150–£450 per door set.
Security hardware
Enhanced multipoint locking, anti-snap cylinders and upgraded hinges generally add £100–£300 each.
Opening condition
Packing, trimming, local repairs and additional perimeter making good can increase the rate by £150–£500 each.
Threshold detail
Low-access thresholds, specialist cills and weathering interfaces commonly add £100–£350 per opening.
Restricted working
Occupied areas, phased access or short working windows can increase installation cost by 10–25%.