Service area · Kent
Premium aluminium bi-fold doors, slim-frame windows and roof lanterns fitted across Dartford, Greenhithe and Stone. Direct access from Essex via the Dartford Crossing — same fitting team, same standards.
Survey within 3–5 working days · 10-year workmanship guarantee · Certass-notified installs
Working in Dartford
Dartford has expanded rapidly off the back of the Bluewater development and the Ebbsfleet International rail link. New-build estates around Greenhithe and Stone are the largest single source of bi-fold and lantern enquiries we get from DA postcodes.
Older Dartford housing — Crayford, Wilmington and the older town centre — runs to interwar semis with bay windows and original timber frames overdue for replacement. The mix is nearly identical to inland Essex stock, which is why our standard product range fits the brief without compromise.
We come over the QE2 Bridge two or three times a week. Dartford Borough Council handles building control; Certass notifications are done in-house. Most DA1, DA2 and DA9 quote slots are diaried inside five working days.
Postcodes: DA1, DA2 and DA9 · Neighbourhoods: Greenhithe, Stone, Bean, Wilmington, Crayford · Local landmarks: Bluewater Shopping Centre, the QE2 Bridge / Dartford Crossing, Bluewater quarry walks.

What we install
Every product on this list is installed weekly across the Kent catchment, with the same fitting team and the same warranty pack.
Surveyed and fitted across DA1, DA2 and DA9
Surveyed and fitted across DA1, DA2 and DA9
Surveyed and fitted across DA1, DA2 and DA9
Surveyed and fitted across DA1, DA2 and DA9
Surveyed and fitted across DA1, DA2 and DA9
Surveyed and fitted across DA1, DA2 and DA9
Surveyed and fitted across DA1, DA2 and DA9
Surveyed and fitted across DA1, DA2 and DA9
Why us
We're not a long way away — the QE2 Bridge puts most of Dartford 30–40 minutes from our base. Same crew, same response standards.
Both systems installed weekly. Premium aluminium bi-fold systems carry long manufacturer warranties and a wide range of profile and colour options.
DA postcode enquiries handled the same week. Quote slots 7am–8pm seven days.
Notification through Dartford Borough Council on your behalf — no extra paperwork on your side.
We won't fit budget aluminium on a DA9 new-build extension. Specification matched to the property and the neighbours.
Written into every quote. 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 Dartford's housing stock — typical property age, build style, and local exposure.
A surprising number of Greenhithe and Stone homes shipped with low-spec PVC frames that are already showing seal failure 8–10 years in. Aluminium replacements are now common.
New-build patios occasionally settle inconsistently. We re-bed thresholds at survey rather than fight a sticking door for years.
Older Dartford terraces have original sashes with rotting frames. Either fully replace or refurbish with timber-effect like-for-like — both routes available.
Current Part F requires trickle ventilation. We include compliant vents on every replacement, regardless of what the old frame had.
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 Dartford (DA1, DA2 and DA9). We work the full borough plus surrounding villages.
FAQs
Nearby areas
See full coverage details for our Gravesend-area installations.
View Gravesend pageSee full coverage details for our Basildon-area installations.
View Basildon 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.