Service area · Essex
Modern A-rated double glazing, flat rooflights and aluminium bi-folds fitted across Harlow new town and the surrounding villages. Specialists in modernist post-war housing stock and the Old Harlow conservation area.
Survey within 3–5 working days · 10-year workmanship guarantee · Certass-notified installs
Working in Harlow
Harlow is the most architecturally distinctive area we work in. Frederick Gibberd's master plan delivered a town where modernist 1950s–1960s housing dominates, and original Crittall-style steel-framed windows are still in service on a meaningful proportion of properties — much of it now in serious need of replacement.
Modern aluminium replacement frames replicate the slim sightlines of the original Crittall installs without the cold-bridging or corrosion. We've done this kind of replacement repeatedly across CM18, CM19 and CM20.
Old Harlow and parts of Sawbridgeworth are conservation areas where character must be preserved — careful timber-effect replacements are usually the route. Harlow Council is the local authority. Quote slots inside five working days.
Postcodes: CM17, CM18, CM19 and CM20 · Neighbourhoods: Old Harlow, Sawbridgeworth, Roydon, Church Langley, Potter Street · Local landmarks: Harlow Town Park, the M11 corridor, Stansted Airport approach.

What we install
Every product on this list is installed weekly across the Essex catchment, with the same fitting team and the same warranty pack.
Surveyed and fitted across CM17, CM18, CM19 and CM20
Surveyed and fitted across CM17, CM18, CM19 and CM20
Surveyed and fitted across CM17, CM18, CM19 and CM20
Surveyed and fitted across CM17, CM18, CM19 and CM20
Surveyed and fitted across CM17, CM18, CM19 and CM20
Surveyed and fitted across CM17, CM18, CM19 and CM20
Surveyed and fitted across CM17, CM18, CM19 and CM20
Surveyed and fitted across CM17, CM18, CM19 and CM20
Why us
Slim-frame aluminium replicates the original Crittall sightlines without the cold-bridging. We've done this regularly across Harlow's modernist stock.
Old Harlow conservation properties get timber-effect aluminium or like-for-like replacement. We won't suggest changes that would force a planning refusal.
CM17–CM20 quote slots open 7am–8pm seven days. Most Harlow visits booked the same week as enquiry.
1960s flat-roof extensions are a Harlow specialty. We install frameless, hinged and walk-on rooflights with full lead flashing detail.
Notification with Harlow Council handled in-house. Compliance certificate posted within 30 days.
Every Harlow install. Aftercare adjustments first 12 months.
Who runs your job
Director, Bi Folds & Windows Direct of Essex Ltd
Billy is the director of Bi Folds & Windows Direct of Essex Ltd — a family-run business incorporated on 20 June 2020 (Companies House No. 12684765) that supplies and installs aluminium bi-fold doors, uPVC and aluminium windows, composite front doors and roof lanterns directly to homeowners across Essex, Kent and Hertfordshire.
What we see locally
Patterns that come up specifically because of Harlow's housing stock — typical property age, build style, and local exposure.
Original Harlow Crittall is corroded, cold and frequently single-glazed. Slim-frame aluminium is the modern equivalent that respects the original look.
Common on 1960s extensions where the flashing was never properly dressed. Re-detail at the time of replacement is essential.
Single-glazed steel frames lose huge heat. Replacement A-rated argon units transform thermal performance and dramatically reduce condensation.
Old Harlow conservation rules limit external changes. Careful timber-effect replacement is the usual route — we'll confirm what's permitted at survey.
Recent work

Customer-supplied install photography is added to this gallery as it becomes available. Names withheld unless explicitly approved.
Our process
01
Booked within your stated response window. We measure, photograph and discuss specification on site — no deposit, no pressure.
02
Frames, glass, fitting and disposal listed separately. The number on the page is the number you pay.
03
Aluminium systems typically 4–6 weeks. PVC and composite doors typically 2–3 weeks. We confirm install date when frames arrive at our yard.
04
Our in-house crew on site. Old frames removed, new units fitted, Certass notification submitted, area swept clean before we leave.
Coverage
Centred on Harlow (CM17, CM18, CM19 and CM20). We work the full borough plus surrounding villages.
FAQs
Nearby areas
See full coverage details for our Hertford-area installations.
View Hertford pageSee full coverage details for our Chelmsford-area installations.
View Chelmsford pageSee full coverage details for our Brentwood-area installations.
View Brentwood pageFree home survey, written itemised quote, no deposit on the visit. Survey slots run 7am–8pm, seven days, normally diaried within 3–5 working days.