Internal Steel Double Doors
Elegant paired doors creating flexible open-plan living while maintaining separation when required.
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Internal Steel Collection
Internal Steel Single Doors
Beautiful architectural internal steel doors for studies, utility rooms, pantries, bathrooms and room dividers — a single glazed leaf that closes a room without closing off the daylight.
5.0 from 7 Google reviewsRecent installations
Internal Steel Single Doors we have designed, surveyed and installed
Why this system exists
01
One opening, properly resolved
A single leaf suits most internal openings between 700mm and 1,100mm wide, hung left or right to suit how the room is actually used.
02
Privacy without darkness
Reeded, fluted or obscure glass gives a bathroom or study privacy while daylight still travels through the plan.
03
Bar layouts that suit the room
Single pane, two-over-two, three-over-three or a full grid, set out so the horizontals align with adjacent joinery.
04
Made to the structural opening
Surveyed and manufactured to your opening rather than trimmed to fit on site, with the frame reveal detailed at survey.
Where a single door earns its place
Most homes have one or two openings that would be transformed by a glazed leaf rather than a painted slab: the study off the hall, the pantry beside the kitchen, the boot room at the back of the house. A single steel-look door borrows light in both directions while still giving the room a door to close.
Because the leaf is glazed, the room beyond stays legible. A study reads as part of the house rather than a cupboard, and a dark hallway takes daylight from a room that has plenty.
Detailing that reads as joinery
Reveals, floor junctions and handle heights are set out at survey so the finished door looks deliberate rather than applied. Where the door sits alongside existing joinery we align the horizontal bars with cill or rail heights already in the room.
Considered detailing is what separates a fitted window from a finished one.
Recent installs
Recently completed across Cumbria and the North West
Real installations from across Cumbria and the North West — surveyed, specified and installed under our own supervision.
Alunet Aluminium Picture Windows, Eco Forest Lodges
Ravenstonedale · 2026
Alunet Aluminium French Door Sets, Eco Forest Lodges
Ravenstonedale · 2026
Glazed Rear Elevation, Heritage Aluminium Windows
Near Penrith · 2025
24 Heritage Aluminium Windows, Matt Black
Near Penrith · 2025
Garden Room Glazed on Three Sides, Jet Black Bifolds
Near Keswick · 2025
Four-Panel Aluminium Bifold Run
Near Keswick · 2025
Aluminium French Door Sets In Original Brick Arches
Near Cartmel · 2025
Timber-Look uPVC Windows, Barn Conversion
Near Cartmel · 2025
Steel-Look Georgian-Bar Casements & Bay Windows
Near Windermere · 2025
Full-Width Garden Room Glazing & Lantern Rooflight
Near Windermere · 2025
Full-Width Slimline Sliding Doors, Clad Remodel
North West · 2025
Black Aluminium Picture Windows, Timber-Clad Elevation
North West · 2025
32 Heritage Windows and 4 Doors, Stone Self Build
West Yorkshire · 2025
Black Heritage Windows with Georgian Bars
West Yorkshire · 2025
Triangular Gable Glazing and Heritage Casements
West Yorkshire · 2025
Steel-Look Doors and Screens, Barn Conversion
North West · July 2026
Flush Casement Windows, Oak-Framed Garden Room
Cumbria · July 2026
Grey Aluminium Windows and Doors, Full Elevation
North West · July 2026
Steel-Look French Doors and Window Set
North West · June 2026
Anthracite Bifolding Doors, Brick Extension
North West · July 2026
Steel-Look Screen and Doors
North West · July 2026
Three-Panel Slimline Sliding Doors
North West · July 2026
Five-Panel Bifolding Doors, Cottage Extension
Cumbria · June 2026
Steel-Look Doors and Matching Screen
North West · June 2026
Slimline Sliding Doors, Brick Courtyard
North West · June 2026
Full-Width Steel-Look Glazed Screen
North West · June 2026
Heritage French Doors with Side Screens
North West · May 2026
Aluminium Windows and Glazed Doors
North West · May 2026
Bifolding Doors to a Barn Courtyard
Cumbria · May 2026
Gable-End Glazing and French Doors
North West · May 2026
Internal Steel-Look Screen
Cumbria · April 2026
Bifolding Doors, Clad Garden Room
Cumbria · April 2026
Aluminium Vertical Sliding Sash Windows
Cumbria · March 2026
Slim 20mm Sliding Door Set
Windermere · May 2026
Heritage French Door Set
Barrow · May 2026
Single Door and Window
Windermere · May 2026
AB60 Smart French Doors
Bowness · May 2026
Heritage Alunet Bifold Doors
Lancaster · May 2026
AS20 Smart Slimline Sliding Doors
Carlisle · January 2026
Farmhouse Extension Aluminium Windows
Carlisle · January 2026
Full House Aluminium Windows
Kirkby Stephen · August 2025
Technical
Specification at a glance
Final performance figures depend on configuration, glass make-up and installation detail. Full data sheets are issued with every quotation.
- Configuration
- Single hinged leaf, left or right hand, in or out opening
- Typical width
- 700mm – 1,100mm per leaf
- Maximum height
- Up to 3m per leaf, subject to glass weight
- Glass
- Toughened clear, grey, bronze, reeded, fluted, obscure or acoustic laminate
- Finish
- Matt black, white, bronze, anthracite grey, textured, dual colour or bespoke RAL
- Hardware
- Slim lever on rose, pull handle, latch, privacy turn or key lock
- Maintenance
- Wipe frames with a damp cloth; lubricate hinges annually
- Guarantee
- 10-year manufacturer backed
Specify it your way
Colours, glass, hardware and details worth saving
Save anything that appeals and it travels with you — into your Inspiration Collection and then into your consultation.
Frame colours
- RAL 7016 AnthraciteThe contemporary default — quiet against stone and render alike.
- Pure White InteriorDual-colour frames that disappear from inside the room.
- Jet BlackSteel-look elevations and rural conversions.
- Painted CreamTraditional joinery language for cottages and farmhouses.
Glass & glazing
- Slim 20mm sliding sightlinesMaximum glass, minimum frame, panes that stack behind one another.
- Corner pocket glazingTwo elevations opening into one another with no corner post.
- Full-height fixed panesFrameless-feeling picture glazing framing one specific view.
Hardware
- Flush lever handlesMinimal, colour-matched and unobtrusive on modern frames.
- Brushed bronze ironmongeryWarm metal against dark frames — the detail people touch.
- Concealed hingesNothing interrupting the sightline when the frame is closed.
Design features
One opening, properly resolved
A single leaf suits most internal openings between 700mm and 1,100mm wide, hung left or right to suit how the room is actually used.
Privacy without darkness
Reeded, fluted or obscure glass gives a bathroom or study privacy while daylight still travels through the plan.
Bar layouts that suit the room
Single pane, two-over-two, three-over-three or a full grid, set out so the horizontals align with adjacent joinery.
Made to the structural opening
Surveyed and manufactured to your opening rather than trimmed to fit on site, with the frame reveal detailed at survey.
Start the conversation
If you are planning an extension, renovation or new-build project and want glazing designed and installed without compromise, we would be glad to talk.
Direct
01768 254554projects@windowsinthelakes.co.ukBased in Appleby-in-Westmorland, with installation teams across Penrith, Keswick, Kendal, Windermere and the South Lakes.
Common questions
Internal Steel Single Doors: your questions answered
Practical answers to what homeowners ask us most about this system. Anything else, just ask.
Ask Us DirectlyVisit the Knowledge CentreKeep exploring
Explore The Rest Of The Internal Steel Collection
Every door in the collection shares the same profile, finishes and detailing, so products can be combined throughout a house without a change in sightline.
Currently viewing: Internal Steel Single Doors
Internal Steel Sliding Doors
Slim steel sliding systems allowing spaces to connect without sacrificing natural light.
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Internal Steel Pivot Doors
Large-format statement doors with concealed pivot hardware for contemporary interiors.
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Internal Steel Bifold Doors
Multi-panel steel glazing allowing complete flexibility between connected spaces.
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Fire Rated Steel Doors
Certified FD30 and FD60 steel doors delivering fire protection while maintaining the same premium architectural appearance.
View ProductKnowledge Centre
Guides worth reading first
Buying Guides · 4 min read
Internal Glazing Guide
How steel-look internal doors and glass screens work, where they suit a home best, and what to consider on glass, framing and privacy.
Flagship guide · 3 min read
Do I Need Fire Rated Internal Steel Doors?
A fire rating is decided by where the door sits, not by what it is made of. Here is how to work out which of your openings need one, and who signs it off.
Glass Advice · 3 min read
Can Fire Rated Steel Doors Have Glass?
Yes — and that is the reason steel-look fire doors exist. The glass simply has to be a certified fire-rated make-up rather than ordinary toughened glass.
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Designed with
Frequently paired with this collection.
RAL 7016 Anthracite GreyColours Studio
Solar Control GlassGlass Studio
Brushed Bronze Pull BarHardware Studio
Flush ThresholdsDesign Details
Obscure Glass CollectionGlass StudioDual Colour: Anthracite / WhiteColours Studio
Design Studio
Keep exploring in the Design Studio
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Let’s design something exceptional.
Bring us your drawings, your site photographs or simply an idea. We will tell you what is possible, what it should cost and how long it will take.