Box sash, casement and French doors in painted timber. Measured, made and fitted by our own team.
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There is no light without one, and no way in without the other.
Windows and doors are often the last thing people think about in a renovation. We put them first. No two houses are the same, so nothing we make is standard.
There is no light without one, and no way in without the other.
Windows and doors are often the last thing people think about in a renovation. We put them first. No two houses are the same, so nothing we make is standard.
The timber range
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01
Box sash
Weights and pulleys or spiral balances, with horns and mouldings to match the period.
02
Casement
Flush or storm-proof sashes, side or top hung.
03
Weights and pulleys
Traditional cords and weights, the way the house was built.
04
Hardware
Brass, chrome or black fittings chosen with you.
In the studio
Cords and pulleys.
Real weights in the box, real cord over the pulley. It runs smooth for decades.
Horns and mouldings.
Run to match the period of the house, not a catalogue.
The meeting rail.
Tight, draught-sealed and finished with the fastener you choose.
Cut through
Solid timber, all the way through.
We cut our own windows in half to show what is inside: timber, joinery and a slim sealed unit. No hollow plastic, no filler.
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FinishedCut through
01Box sash head
02Meeting rails
03Sash sill
Recent projects
Fitted in London.
Box sash, casements, bays and leaded lights, made for each opening and fitted by our own team.
Box sash, Victorian terraceMews house, windows and doorsWhole houseBay casementsBox sash over the sinkBox sashes, bathroomLeaded casementLeaded casements and doorBox sashes, front elevation
0years building in London
0weeks from signed drawings to fitting
0box sash frame, solid timber
Material
Engineered timber
Glazing
Slim double glazing
Finish
Factory painted, any colour
Fitting
Our own installers
Detail
Joinery you can feel.
Technical drawings
Drawn in section.
The box sash and the flush casement, cut through vertically and horizontally: frame, sashes, glazing and seals, in millimetres.
01Box sash on weights · 148 mm frame
02Flush casement · 84 mm frame
Tall box sashes with folding shutters
How it works
From the opening to the fitted windows.
01
Send the opening
Sizes, a few photos or the architect's drawings. By email or through the form.
02
Drawing and price
We draw your windows to the opening and send a fixed price, usually within 48 hours.
03
Survey and sign-off
We measure on site and you sign the workshop drawings before anything is made.
04
Made and fitted
Made to measure in 6 to 10 weeks. Fitted by our own team, with the site left clean.
The team behind WDL has built extensions and lofts across London for 25 years, mostly with architects. Our projects have been featured in The Times and 25 Beautiful Homes.
French, single and pivot doors with side lights for rear and side elevations.
02
Internal screens
Glazed partitions and doors between rooms, fixed or opening.
03
Windows
Casement and fixed steel windows to replace or extend.
Choose your lines
Five ways to divide the glass.
The details
Made in the details.
Matt black steel, welded and ground by hand, with fittings chosen with you: lever handles, knuckle hinges, locks with keys and glass from clear to reeded.
Lever handle on a round roseKnuckle hinge with finialsReeded glassGlazing bars, welded crossLock with keyWelded corner, ground smooth
Choose your lines
A style guide for your doors.
The layouts we make most often. Quote the code when you ask for a price, or send us a sketch and we draw it to your opening.
Single doors, French doors and screens with doors
FD30 fire doors
For doors on an escape route. Steel and glass assessed to BS 476-22, accepted by Building Control on our previous projects.
Glass
Clear toughened as standard. Laminated, fluted or reeded glass for privacy in bathrooms and studies.
Colour
Matt black as standard; bronze, anthracite or any RAL colour.
Doors
Single, French, sliding on a top track or pivot doors, with handles chosen with you.
Technical details
How the steel is built.
Section drawings of the steel systems we use: slim welded frames, glass set in a gasketed rebate, and glazing bars that read the same from both sides. Every door is drawn again to your sizes on the workshop drawings.
01W40 · slim Crittall style section
02Economy 50 E30 · FD30 fire door
0340 mm sections · internal door
04Janisol 2 EI30 · fire rated screen
Manufacturer section drawings, dimensions in millimetres. Final sections are confirmed on the workshop drawings for your approval.
Material
Steel sections
Finish
Black, any RAL to order
Lead time
From 12 weeks
Fitting
Our own installers
Detail
Every weld, every line.
How it works
From the opening to the fitted steel.
01
Send the opening
Sizes, a few photos or the architect's drawings. By email or through the form.
02
Drawing and price
We draw your steel to the opening and send a fixed price, usually within 48 hours.
03
Survey and sign-off
We measure on site and you sign the workshop drawings before anything is made.
04
Made and fitted
Made to measure, from 12 weeks after sign-off. Fitted by our own team, with the site left clean.
The team behind WDL has built extensions and lofts across London for 25 years, mostly with architects. Our projects have been featured in The Times and 25 Beautiful Homes.
Minimal aluminium sliding doors and rooflights for extensions and garden rooms.
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Recent project · Hampton, TW12
Open the back of the house to the garden.
Cortizo sliding systems in two, three or four panels. Rooflights supplied and fitted; the upstand is built by your builder.
Sliding doors and rooflights
Cortizo slim sliding doors and flat rooflights for rear extensions, measured, supplied and fitted as one job.
Guide price, fitted, from£6,000to £6,900 + VAT
3.1 m wide opening · 2 panels
2 m4 m6 m
Elevation and plan, drawn to scale, 2.4 m high
A guide for budgeting, for doors up to 2.4 m high, with measuring, delivery and fitting by our own team. Taller doors, glass corners and pocket walls are priced on the drawing. Your fixed price follows the survey.
Rooflights
Light from above, made to size.
Flat rooflights made to your opening and fitted together with the sliding doors. A deep extension becomes the brightest room in the house.
Rooflights
Light from above, made to size.
Flat rooflights made to the size of your opening, with slim frames and toughened, laminated safety glass. Fitted together with the sliding doors, they turn a deep extension into the brightest room in the house.
Fixed rooflights made to measure
Double or triple glazed safety glass
Your builder builds the upstand to our drawing
We lift and fit the rooflight, usually in half a day
Hampton, TW12 · Side return rooflightRooflight and sliding doors
Recent projects
Fitted by our own team.
Rear extensions with slim aluminium sliding doors and rooflights across London, measured, supplied and fitted by us.
Glass corner and sliding doorsKitchen to the gardenDining under the rooflightHampton, TW12 · Slim black frameHampton, TW12 · Glass link and sliding doorsHampton, TW12 · Rooflight over the side returnHampton, TW12 · From the garden
The system
Cortizo COR Vision.
A thermally broken, minimalist aluminium sliding system. Slim profiles maximise the glass, while stainless steel adjustable rollers keep large panes moving smoothly for years.
0central interlock, the slimmest line in the glass
0per pane, on stainless steel rollers
0security tested
Very slim 20 mm central interlock
Frame can be concealed in the floor, walls and ceiling
Stainless steel adjustable rollers, panes up to 320 kg
Flush, concealed handle in the interlock
PAS 24 security tested
Polyester powder coat in any RAL colour; matt black RAL 9005 or anthracite RAL 7016 recommended
Hidden track in the floor, section
Interlock with concealed handle, plan
Two options
COR Vision Plus or COR Vision.
COR Vision PlusCOR Vision
COR Vision Plus
COR Vision
Central interlock
25 mm
20 mm
Frame depth
180 mm (2 tracks)
116 mm (2 tracks)
Glazing
Triple glazed, toughened safety glass
Double glazed, toughened safety glass
Thermal performance
Uw from 0.9 W/m²K with triple glazing
Uw from 1.3 W/m²K
Acoustic insulation
Rw up to 43 dB
Rw up to 41 dB
Air / water / wind
Class 4 / up to 9A / up to C4
Class 4 / 7A / C5
Security
Multipoint locking in the interlock
PAS 24 tested
Maximum pane
4.0 × 4.0 m, 400 kg (700 kg motorised)
2.5 × 3.0 m, 320 kg
Best for
Maximum comfort and quietness, the flagship choice
Elegant openings of this size, excellent value
Performance figures are the manufacturer's published values for the system. Final values for your doors depend on size, configuration and glass, and are confirmed with the order.
Hidden track set flush into the floor
System
Cortizo
Panels
2, 3 or 4 sliding
Rooflights
Supply and fit
Guide price
From about £6,000 + VAT fitted, for a 3.1 m wide opening
How it works
From the opening to the fitted doors.
01
Send the opening
Sizes, a few photos or the architect's drawings. By email or through the form.
02
Drawing and price
We draw your doors to the opening and send a fixed price, usually within 48 hours.
03
Survey and sign-off
We measure on site and you sign the workshop drawings before anything is made.
04
Made and fitted
Made to measure in around 10 to 12 weeks. Fitted by our own team, with the site left clean.
The team behind WDL has built extensions and lofts across London for 25 years, mostly with architects. Our projects have been featured in The Times and 25 Beautiful Homes.
FinishedCut through
