What are black sliding doors?
Black sliding doors are aluminium sliders powder coated in a black RAL shade, most often RAL 9005 jet black or RAL 9004 signal black. Jet black is the deeper, true black; signal black is a fraction softer and can look a little warmer in daylight. Either can be supplied as a smooth matt or satin finish, or as a fine-textured finish often called sandtex, which has a slightly gritty feel and a subtle sparkle that hides marks well.
Black frames tend to visually recede, so the eye passes through to the garden and the sightlines look slimmer than the same frame in white. That is why black is a common choice for minimal extensions, white rendered houses and steel-look schemes. The colour is applied by electrostatic powder coating and baked on, so it is part of a hard, continuous film rather than a paint that will need redoing.
There is one practical point to weigh up. Dark colours absorb more of the sun's heat than pale ones, so on a south- or west-facing elevation a black frame gets noticeably hot to the touch and expands a little more through the day. Quality thermally broken aluminium systems are designed to cope with that movement, and solar-control glass can limit how much heat comes into the room behind a large dark door.
Who are they for?
Best suited to
- White or light rendered houses
- Minimal extensions with slim sightlines
- Steel-look and industrial schemes
- Framing a garden view like a picture
Worth considering
- Black frames absorb more heat, so they get hot to touch on south- and west-facing elevations in summer.
- Smooth black shows dust, pollen, water spots and fingerprints more than almost any other colour.
- Scratches on black reveal the lighter metal underneath more obviously, so touch-up repairs are more noticeable.
Why choose black sliding doors?
- A black frame recedes against the view, so even a door with a standard-width interlock can look slimmer and more minimal than the same profile in a pale colour.
- Jet black RAL 9005 gives a crisp, deep contrast against white render or pale brick, turning the door into a strong graphic element on the elevation.
- Signal black RAL 9004 is a fraction softer than jet black, which can suit homes with warmer stone or brick where a pure black would look harsh.
- A fine-textured sandtex finish has a slightly gritty surface that disguises fingerprints, light scratches and water marks better than a smooth black coating.
- Black frames can be paired with black handles, interlock caps and track covers so the whole door, including its hardware, reads as a single dark outline.
- Thermally broken aluminium systems are designed to cope with the extra expansion that comes from dark frames heating up in strong sun.
- With a dual colour frame you can keep black outside for the architecture and choose a lighter colour inside, so a small room does not feel enclosed by dark framing.
- Powder coating bonds the black colour to the metal with heat, so the frame does not need repainting, only washing with mild soapy water a few times a year.
Typical specification
| Colour references | RAL 9005 jet black; RAL 9004 signal black |
|---|---|
| Finish textures | Smooth matt or satin; fine-textured sandtex, depending on the system |
| Coating | Oven-cured polyester powder coating |
| Dual colour | Available: black outside, another colour inside |
| Solar heat | Dark frames run warmer in direct sun; solar-control glass available |
| Typical whole-door U-value | Typically around 1.2–1.6 W/m²K when double glazed; the frame colour does not change it |
| Hardware | Black handles, interlock caps and track covers to match |
Figures are typical and vary by system and size; your quote confirms the exact specification.
How much do black sliding doors cost?
A single-colour black aluminium sliding door in a 2.4 m two-panel size has a guide price of £4,295–£5,295, fitted, inc VAT at standard 2.1 m height, with the final price fixed in a written quote after survey.
| Overall width | Typical panels | Guide price (fitted, inc VAT) |
|---|---|---|
| 1.5 m | 2 panels | £3,295–£4,095 |
| 1.8 m | 2 panels | £3,695–£4,495 |
| 2.1 m | 2 panels | £3,995–£4,895 |
| 2.4 m | 2 panels | £4,295–£5,295 |
| 3.0 m | 2 panels | £4,995–£6,095 |
| 3.6 m | 3 panels | £5,595–£6,895 |
| 4.0 m | 3 panels | £6,095–£7,395 |
| 4.8 m | 4 panels | £6,995–£8,495 |
| 6.0 m | 4 panels | £8,295–£10,095 |
Guide prices for a standard 2.1 m high door, supplied and fitted, including VAT and removal of an old door of similar size. Your price is fixed in a written quote after survey.
Options and extras
- Jet black RAL 9005. The deepest standard black, for the sharpest contrast with pale walls.
- Signal black RAL 9004. A slightly softer black that can sit more easily against warm-toned brick or stone.
- Sandtex texture. A fine, slightly gritty finish that hides marks and fingerprints.
- Smooth matt black. A flat, modern finish for the cleanest look, accepting that it shows dust more.
- Dual colour frame. Black on the outside with white or a soft neutral on the room side.
- Solar-control glass. Coated glass that cuts summer heat gain behind a large black door on a sunny elevation.
Lead times and fitting
Lead time: Typically 4–6 weeks after survey sign-off.
Fitting: Typically 1 day for a straight swap of a two-panel door; larger doors 1–2 days.
Nothing is ordered until you confirm the surveyed specification in writing. See how it works.
Rules and approvals
England
In England, a replacement sliding door is a controlled fitting under the Building Regulations. In an existing home, a door with more than 60% glazing must reach a U-value of 1.4 W/m²K or better (or a Doorset Energy Rating of band C) under Approved Document L, and glass in doors must be safety glazing under Approved Document K. We arrange compliance through a competent person scheme installer or by notifying Building Control, and you receive the certificate.
Wales
In Wales, replacement doors are covered by the Building Regulations as applied in Wales, including the Welsh Part L energy requirements and safety glazing rules. Compliance is arranged through a competent person scheme installer or your council's Building Control, and the certificate is kept with your property records.
Scotland
In Scotland, replacing a door like for like in a house does not usually need a building warrant, but the new door must still meet the Scottish building standards for energy and safety. Forming or widening an opening is different: that needs a building warrant from the council before work starts.
Northern Ireland
In Northern Ireland, the Building Regulations (Northern Ireland) apply through your district council's building control service, with energy guidance in Technical Booklet F1. Work in Northern Ireland is by arrangement, and we confirm the approval route for your property at survey.
Black sliding doors: common questions
What is the difference between RAL 9005 and RAL 9004?
RAL 9005 is jet black, the deepest standard black, while RAL 9004 is signal black, which is very slightly lighter and softer. Side by side, 9005 looks more intense and 9004 can appear marginally warmer. On a door frame the difference is subtle, so most people decide by looking at both samples against their own brick or render.
What is a sandtex finish?
Sandtex is a common trade name for a fine-textured powder-coat finish with a slightly sandy feel. It is popular on black frames because the texture breaks up reflections and disguises fingerprints, small scratches and water marks that would stand out on smooth black. It is applied and cured the same way as other powder coatings.
Do black sliding doors get hot in the sun?
Yes, black frames absorb more solar heat than lighter colours, so on a south- or west-facing elevation they can become hot to touch on a sunny afternoon. Good thermally broken aluminium systems are designed to handle the extra expansion. If the glass area is large, solar-control glass helps limit how much heat passes into the room as well.
Are black sliding doors harder to keep clean?
Smooth black frames show dust, pollen, limescale spots and fingerprints more than most colours, so they may need wiping more often to look their sharpest. A textured sandtex black is noticeably more forgiving. Either way, warm water with a little mild detergent and a soft cloth is all a powder-coated frame needs.
Will black frames make my room feel darker?
Black frames do not reduce the glass area, so they let in the same daylight as the same door in white. What changes is the look: a dark outline frames the view more strongly, which can feel enclosing in a small room. A dual colour frame, black outside and lighter inside, is a common way to avoid that.
Can I have black sliding doors in uPVC?
Yes, uPVC sliding doors can be supplied in black, usually as a foil laminated to the white uPVC profile. Dark foils on uPVC expand more in strong sun than aluminium, and the look and texture differ from powder-coated aluminium. Our uPVC sliding doors page explains the colours available on that material.
Does a black frame affect the U-value?
The frame colour does not meaningfully change the tested U-value of an aluminium sliding door, which depends on the thermal break, the glass and the seals. A good double glazed thermally broken aluminium slider typically achieves around 1.2–1.6 W/m²K for the whole door, depending on the system and glass specification.
How much do black aluminium sliding doors cost?
On our aluminium doors black is a standard colour, so a single-colour black door is normally priced the same as white. The guide price for a 2.4 m two-panel door is £4,295–£5,295, and for a 3.6 m three-panel door £5,595–£6,895, fitted, inc VAT at standard 2.1 m height. Dual colour or special textures can add to the price.