Fire performance
Certified FD30S construction typically adds £300–£600 per doorset, while FD60S can add £650–£1,100.
Ironmongery
Upgrading to access control, panic hardware or specialist security sets can increase the rate by £250–£1,200 per door.
Leaf and finish
Hardwood veneer, laminate or bespoke factory finishes commonly increase the base rate by 15%–35%.
Opening condition
Packing, trimming and local making good to inaccurate openings can add £100–£300 per doorset.
Size and configuration
Oversized, double-leaf or unequal-pair arrangements generally add 40%–100% compared with a standard single leaf.
Quantity and access
Small batches, multiple workfaces or restricted delivery routes can increase installed rates by 10%–25%.