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 from surveying help to installation techniques and best practice.

Typical support topics include:

  • Understanding glazing design and system limits
  • Getting the correct frame size
  • Door threshold advice
  • The impact of external and internal finishes
  • Installing glass and weight transfer
  • Ordering guidance

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


Download The Installation Guide

Our versatile slim aluminium heritage window and door systems are suitable for a wide range of applications including: listed building projects with planning constraints, replica refurbishment, art deco, contemporary and new build developments.

They provide the best alternative to Steel Windows and Doors at a fraction of the cost

A unique steel replacement aluminium heritage window system with ultra slim sight lines has been specifically designed to authentically replicate the appearance of traditional steel window frames.

Rated 5.0 out of 5 Nicholas Kitchen

I ordered three sets of doors to self-install: the team at Marlin were really helpful with all my technical queries, which helped make sure my orders were mm perfect and the doors all went in smoothly with the glazing bars all lining up precisely. They look great - will do it all again in our next house!


Elegant slim frame profiles authentically replicate steel doors from a bygone era. Single heritage door, French door or now *NEW* heritage Bi-fold door options are available along with classic glazing bars to create a vintage look that is thermally efficient and highly secure.

Rated 5.0 out of 5 Andy Myers

Love our new heritage windows and door. Great product and fit for our home. Really great service from Adrian, Hannah, Julian and rest of the team. Thank you!

Visofold 6000 bifold doors lock

Premium Security Fitted As Standard With Patented Active Cam Technology

The clever locking system of the Avocet ABS® diamond grade cylinder knows when it has been snap attacked and fires into action to create a robust barrier to entry. The patented Active Cam TechnologyTM is hidden deep within a solid Molybdenum cam which is 20% stronger than steel, and delivers ultimate resistance against a lock snapping attack and snap/twist manipulation. All of the snap technology is focused on the outside part of the lock only. This makes sure that maximum strength is given to the inner part of the lock - the part that has the job of securing your door.

Visofold 6000 bifold doors secure by design


The heritage look can now be continued throughout the home with our *NEW* interior heritage glazing system designed specifically to provide dedicated internal heritage glazing for steel look partition doors, screens, glass walls and room dividers.

This versatile system provides the opportunity to create or partition a living or home office working space whilst ensuring high levels of natural light can flood between rooms.

Rated 5.0 out of 5 Gareth Robinson

We used Marlin for windows and internal traditional steel style doors and screens using Alitherm Heritage products 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... simply stunning. Would highly recommend.

View Our Featured Heritage Glazing Collection Projects:


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


"Really happy with those doors" says homeowner Lauren


Heritage Window & Door Inspiration & Advice

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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Rated 5.0 out of 5 Helen Westwell

Fantastic company, great product and extremely helpful throughout.

Read this and other Reviews of Marlin Windows left on Google



Call 01535 603909