Heritage Windows & Doors
Beautifully Crafted Steel-Look Aluminium Windows and Doors
Manufactured in Yorkshire since 2003. Designed for period properties, conservation areas and contemporary homes.
Our slim aluminium systems are ideal for period properties, listed buildings, conservation areas, and contemporary homes seeking an industrial or heritage aesthetic.
You get the best of both worlds:
Elegant steel-style aesthetics with period-correct detailing
Exceptional thermal performance for year-round comfort
Engineered for strength, security, and longevity
Virtually maintenance-free aluminium construction
Ideal for listed buildings and heritage renovations
Why Choose Heritage Aluminium?
Traditional steel windows look stunning—but they’re cold, expensive, and high maintenance.
Our aluminium heritage systems are designed to solve that.
The Benefits
- Slim sightlines for an authentic steel look
- Energy-efficient glazing to keep your home warm
- Durable powder-coated finishes (up to 25-year lifespan)
- Advanced security locking systems
- No rust, warping or repainting required
Perfect for:
- Renovating period homes
- Upgrading steel windows
- Extending character properties
- Creating modern industrial interiors
Aluminium vs Steel
| Feature | Heritage Aluminium | Traditional Steel |
|---|---|---|
| Maintenance | Low | High |
| Thermal efficiency | High | Low |
| Cost | Medium–High | High |
Find the Right Heritage Product
Whether you’re replacing windows, adding doors, or redesigning your space, we have a solution.
Heritage Windows
Classic steel-look windows with slim frames and glazing bars—ideal for period renovations and conservation areas.
Heritage Exterior Doors
Front, back, French and patio doors with traditional styling and modern performance.
Heritage Bifold Doors
Open up your space while maintaining a heritage aesthetic.
Interior Heritage Doors & Screens
Perfect for dividing spaces with light—ideal for modern industrial interiors.
Steel Window Replacements
Upgrade old steel frames with energy-efficient aluminium alternatives that match the original look.
Find the Right Solution for Your Project
Explore our heritage window and door comparisons to understand the differences in design, features and performance, helping you choose the right solution for your home.
Explore Our Heritage Collection
Discover beautifully crafted steel-look aluminium windows and doors, from traditional heritage replacements to contemporary designs.
Listed Buildings & Conservation Areas
Preserving the character of a period property requires careful attention to design, proportions and architectural detail.
At Marlin Windows, we have experience supplying heritage aluminium glazing for listed buildings and properties within conservation areas. We work with homeowners, architects and project teams to help achieve sympathetic glazing solutions that respect the character of each property, subject to the necessary planning and listed building approvals.
Explore our completed projects to see how traditional architectural character can be complemented by modern glazing performance.
Explore More Listed & Conservation Area Projects
Supply & Installation Options
We offer flexible ways to get your new Heritage windows and doors:
Supply & Install
Full professional installation across:
- Yorkshire
- Manchester
- Lancashire
- Surrounding areas
Supply Only
Order directly for your builder or project—available nationwide.
Why Choose Marlin for Heritage Windows & Doors?
Yorkshire manufacturing, specialist expertise and dependable service from start to finish.
✔ 10-year warranty on windows and doors
✔ 5-year warranty on double-glazed units
✔ Up to 25-year powder coating guarantee
✔ Experienced installation teams
✔ Trusted by homeowners, renovators and developers
Discover the UK’s Largest Heritage Glazing Showroom
Marlin Windows has one of the UK’s largest on-display collections of heritage aluminium glazing, giving homeowners the opportunity to explore a wide range of steel-look windows and doors in person.
From slimline interior screens to heritage-inspired exterior windows and doors, our showroom brings together the design, detail and versatility of modern industrial-style aluminium systems.
Our experienced team is on hand to offer expert technical advice, answer your questions and help you find the right solution for your project — all with absolutely no pressure to buy.
Marlin Windows | Supply Only
Supply Only – Online Ordering Available
Our bespoke ordering service is second to none, but we also offer a Buy Online Service for our industry-leading door products. Configure and purchase selected products online with ease.
Ready-Made | Exterior
Ready-Made Heritage Doors
Stylish exterior aluminium doors with an authentic steel-look finish, ready to order online.
✓ Nationwide delivery in approximately 7–10 working days
Made to Measure | Exterior
Exterior Heritage Doors
Slimline exterior aluminium doors, made to your measurements and crafted to replicate the classic steel look.
✓ UK-wide delivery in approximately 3–4 weeks
Made to Measure | Interior
Interior Heritage Doors
Transform your interiors with bespoke slimline aluminium heritage doors, custom-made to your exact measurements for a stylish industrial-inspired look.
✓ Nationwide delivery in approximately 3–4 weeks
The Marlin Difference
Quality craftsmanship, personal service and attention to detail at every stage.
Quality Control
Quality is at the heart of everything we do. From manufacturing to final inspection, our carefully managed processes help ensure every window and door meets our exacting standards.
Care
We respect your home, your property and your project. Our team takes care of the details, offering personal support from your initial enquiry through to delivery, installation and aftercare.
Project Focus
No two projects are the same. We manufacture to your exact measurements and work closely with you to achieve glazing solutions that complement your property’s design and individual requirements.
Real Projects, Real Results
See how our heritage windows and doors look in real homes—from period renovations to modern extensions.
View Case Studies
Latest projects
HERITAGE WINDOWS AND DOORS
Batt House, Northumberland Alitherm Heritage Windows and Doors
HERITAGE DOORS
Barn Gym Conversion – White House Farm, High Catton, York
HERITAGE WINDOWS AND DOORS
Alitherm Heritage Glazing for a Character Property in Eakring, Nottinghamshire
Expert Advice, Personal Service
Choosing the right windows and doors is an important part of any project. Our experienced team is here to help you make informed decisions, whether you’re renovating a period home, replacing traditional steel windows or planning a new build.
From product selection and made-to-measure sizing to thresholds, glazing specifications and ordering, we’re happy to offer practical guidance at every stage.
We also provide a free sample service to help with design decisions, surveying and planning applications.
Speak to our team on 01535 603909.
Helpful guides
Replacing Windows In A Conservation Area
Approved Aluminium Windows For Conservation Areas.
1. Do I need permission?
2. What do local authorities say?
3. What help can I expect from my local conservation officer?
4. Can I replace wood with thermally efficient aluminium?
5. Which Aluminium Windows & Doors have been approved in conservation areas?
6. Which conservation areas have aluminium replacement windows?
7. What are the key features that enabled consent to be granted?
8. What do historic England say?
9. Featured Conservation Area & Listed Building Projects
Frequently Asked Questions
If you require any support, please don’t hesitate to review our FAQ’s below or drop us a message on our contact form here
How slim are Heritage aluminium window frames?
Our Alitherm Heritage windows feature exceptionally slim sightlines, with fixed outer frames as narrow as 33mm. Designed to replicate the appearance of traditional steel windows, they maximise natural light while maintaining an authentic heritage look. Frame dimensions vary depending on the system and opening configuration.
Are Heritage windows and doors suitable for listed buildings and conservation areas?
The Heritage slim systems have already been approved for listed building projects by many councils including:
London Boroughs of Islington, Camden and Tower Hamlets, Watford Borough Council, Essex County Council and Leeds City Council as well as Cadw, the Welsh Government’s historic environment service.
How energy-efficient are Heritage windows and doors?
Our thermally broken Heritage aluminium systems combine traditional styling with modern energy efficiency. Depending on the product and glazing specification, certain configurations can achieve whole-unit U-values as low as 1.2 W/m²K. We can advise on the appropriate system and thermal performance for your project.
Can aluminium Heritage windows replace traditional steel windows?
Yes. Our Alitherm Heritage range is specifically designed to recreate the slim proportions and distinctive appearance of traditional steel windows. It offers a practical, low-maintenance alternative while retaining the character of period properties, Art Deco homes and industrial-style glazing.
Can I choose different colours, glazing bars and window styles?
Yes. Our Heritage windows and doors are made to measure, with a choice of configurations, glazing bar arrangements and powder-coated finishes. Whether you’re recreating an original steel window design or introducing heritage styling into a modern extension, we can help you achieve the right appearance.
Do you offer supply-only or installation services for Heritage windows and doors?
Yes. Marlin Windows offers both supply-only and professional installation services for Heritage aluminium windows and doors. Whether you’re working with your own builder or would prefer our experienced team to manage the installation, we can help you find the right solution for your project. Selected Heritage products are also available to order online.
Come and explore…
Aluminium Bi-fold Doors, Aluminium Heritage Windows, Traditional Steel Replacement Windows and Doors.
