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See our range of external steel look heritage windows & doors here.


Create light filled private spaces with all new AluSpace elegant glass wall partitions.

A versatile system providing the opportunity to create or partition living or home office working spaces whilst ensuring high levels of natural light can flood between rooms.

Divide internal areas of any size or shape with elegant steel-look framework and authentic single pane glass apertures or use double glazing for an affective acoustic barrier.


Get 0% Interest Free Credit on Alitherm Heritage Doors

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internal crittal style steel look heritage partition doors

NEW: The Perfect Screening Solution

Divide or delineate internal space

Create new internal spaces for a wide range of applications with single, double or pivot door configurations

Key Features

  • Bespoke – made to measure custom fit
  • Extensive design and layout options
  • Classic slim steel-look sight lines
  • Fixed screens with or without doors
  • Allows for a run through floor finish
  • Single pane glass or acoustic double glazed
  • Exceptional quality with low maintenance



Rated 5.0 out of 5 Gareth Robinson

We used Marlin for windows and traditional Steel Replacement doors and screens on our recent self build project.
Marlin are not local to us but provided an excellent service from quotation, advice, redesigns and with very detailed comms throughout.
The windows and doors are the talking point of our entire build. Adrian from Marlin said that windows become the eyes of the house and I didn't forget that - our eyes are simply stunning.
Would highly recommend.


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Supplied and delivered for home and home office


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Rated 5.0 out of 5 Noel Brown

We are delighted with the finished product. All our other professional contractors on site have also commented how impressed they are with the Marlin product quality & finish. We have no hesitation in recommending Marlin & can only thank them again for their superb service.


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Glazing and frame colour choice

The Finishing Touches

Wide range of design enhancing options

Accessorise your glazing with the all-important finishing touches including a choice of retro, industrial or modern door furniture. Tailor to meet virtually any design style with visible hinges or concealed pivot mechanisms and more.

Key Features

  • All RAL frame colours
  • Textured frame coatings available
  • Alchemy and anodized finishes
  • Colour matched door handles and hinges
  • Vintage hardware range
  • Compliments our external Heritage window and heritage door system



Rated 5.0 out of 5 Dom B

From our initial contact with Marlin Windows we have been very impressed. Super customer service, they actually answer the phone and call back promptly if they’re not available... very helpful throughout with technical advice. The final products... look stunning.


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Technical advisors are on hand at the aluminium window and door showroom in Keighley in West Yorkshire

Unrivalled Quality Customer Service

Our high quality window and door products are backed by the same high quality customer service. Technical advisors are just a phone call away to answer all your questions no matter how technical.

Typical help provided includes:

  • Choosing the right product
  • Getting the right made to measure size
  • Help with ordering
  • Threshold advice

We provide a FREE sample service to assist with surveying decisions, design considerations, or planning applications – just pick up the phone and ask.

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Quality glazing backed by expert 5 star customer service


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Glazing and frame colour choice


Our aluminium profiles are polyester powder coated by our systems suppliers using the very latest paint application techniques guaranteed for 25 years.

Fully compliant to the latest June 2022 building regulations our standard double glazing is the exceptional light transmitting, energy saving ClimaGuard® A+ low emissivity (Low-E) glass manufactured by Guardian Glass.

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View Our Featured Steel Replacement Projects:


"Beautiful doors" - George Clarke (Channel 4 - George Clarke’s Old House New Home)


"Really happy with those doors" says homeowner Lauren


Document Downloads

File Type Document Description Download Document
Adobe PDF AluSpace Brochure Download (5 MB)

The Buyers Guide To French Doors

guide to how to aluminium french doors

Read our guide to buying french doors for your home

Replacing Windows In A Listed Building

Read our guide to replacing windows in listed buildings

Read our guide to listed building window replacement

Replacing Windows In Conservation Area Properties

Read our guide to replacing windows in conservation area buildings

Read our guide to conservation area property window replacement


Why Choose Marlin Windows?

We care...

about the quality of finish
about you, your project and your property
about your 100% satisfaction

And we are rated ★★★★★ on Google

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"our builder said they were the best supplier and fitter they had ever used"
Mrs Nellist Haworth, Yorkshire


Call 01535 603909