How much should I budget for security double-glazed units in Harpenden?
Typical prices for security double-glazed units in Harpenden are £174 to £594 including VAT (£145 to £495 plus VAT) per unit, supplied and fitted. Use the quote tool for a guide figure, then we survey and confirm a fixed price.
A security double-glazed unit is a sealed unit in which one or both panes are laminated glass, usually the inner pane, so the window keeps its insulation but resists being broken through. It fits the same frame as a standard unit and is the simplest way to add security to modern windows and doors.
Glass and fitting options
- Warm-edge spacer bars in black, grey or white
- Security glazing tape or clips where beads are external
- Made to measure for each sash, light and door panel
- Obscure and decorative glass for bathrooms and doors
- Low-E coating and argon fill for insulation
- Toughened outer pane where safety glass is required
Fitting in Harpenden and nearby
From the AL5 district we also cover St Albans (5 miles) and Luton (5 miles). Survey dates depend on installer availability.
Hertfordshire includes the historic centres of St Albans and Hertford, post-war new towns such as Stevenage and Hatfield, and Watford's shops and office parks along the M1.
Common uses:
- Replacing misted or damaged units
- Patio doors and bifolds
- Windows in flats on walkways and balconies
- Glazed back and side doors
What to think about first
Internal or external beads
If your beads are on the outside, we add security tape or clips so the unit cannot be lifted out after the beads are removed.
Energy performance
Choosing low-E glass, argon and warm-edge spacers keeps the window as efficient as possible, often better than the unit being replaced.
Consents and safety: England
Replacing glass in an existing frame
Replacing only the glass or sealed unit in an existing frame is generally treated as a repair in England rather than notifiable building work. Replacing a whole window or door is notifiable and is normally certified through a competent person scheme or approved by building control. Either way, new glass in a critical location should still be safety glass.
Safety glass in critical locations
In England, section 5 of Approved Document K treats glazing in doors and in side panels within 300 mm of a door edge, from floor level up to 1,500 mm, and any other glazing below 800 mm, as a critical location. Glass there should break safely, be robust, or be guarded. Laminated or toughened glass meeting BS EN 12600 class 3 is the usual answer, rising to class 2 for door and side-panel panes wider than 900 mm.
How it works
- Postcode and a few photos
- On-site survey
- Fixed written price and lead time
- Fit, check and explain
Security double-glazed units in Harpenden: questions
Can you survey in Harpenden and nearby towns?
Yes. Surveys in Harpenden, St Albans and Luton are booked around installer availability.
Will a laminated unit be heavier?
A little. A laminated pane weighs about the same as a solid sheet of the same thickness. On large opening sashes we check hinges and friction stays.
How long do new units take?
Units are made to order after the survey. Lead times vary with glass type and size, and we confirm them when we quote.
Can I just replace the glass and keep my frames?
Yes, if the frames are sound. We measure each unit, make security units to the same size and fit them into your existing frames.
Security double-glazed units in nearby towns
- St Albans5 miles
- Luton5 miles
- Hemel Hempstead6 miles
- Welwyn Garden City7 miles
- Hatfield7 miles
- Dunstable9 miles
Other glazing in Harpenden
- Laminated roof and conservatory glass
- Security glass for doors
- Security glass for home windows
- Anti-bandit glass
- Security secondary glazing
- Shopfront security glass
Start with a guide price online, then we survey and fix the price in writing.