Replicate the appearance of traditional steel doors from a bygone era with classic glazing bars and panel designs to create a vintage look.
Alitherm Heritage has been designed to offer a solution for heritage properties and building renovation projects where there is a need for a modern replacement or alternative to old steel.
I'd wholeheartedly recommend Marlin Windows. We ordered Steel Replacement French Patio doors and Windows. They are absolutely beautiful. And they were an absolute pleasure to deal with. Thanks Marlin!
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:
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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...really helpful with all my technical queries, which helped make sure my orders were mm perfect and the doors all went in smoothly...
They look great - will do it all again in our next house!
Super customer service, they actually answer the phone and call back promptly if they’re not available... very helpful throughout with technical advice.
Our fabulous Heritage Doors featured on
George Clarke’s Old House New Home (The Edwardian house in Golders Green London)
broadcast on Channel 4 in November 2018
Watch the full episode here or
Watch the 90 seconds programme highlights
"Beautiful doors" - George Clarke (Channel 4 - George Clarke’s Old House New Home)
"Really happy with those doors" says homeowner Lauren
For when you need modern, secure, thermally efficient doors without sacrificing the heritage and character of your traditional or period property.
This extremely versatile aluminium door system is an authentic and cost effective glazing solution ideally suitable for a wide range of applications including heritage, listed, retro refurbishment and Art Deco projects. Looks like steel.
With slim sight lines that create maximum glass areas the stepped frame profiles, glazing bar options and hardware choices offer a classic appearance with excellent thermal and operational performance.
Exclusive hardware and a dedicated window system with matching frame profiles is also available to compliment this door system.
The Smart Alitherm Heritage door is the ideal replacement for steel doors on heritage applications such as building renovations or apartment conversions.
The Alitherm Heritage door provides the solution for conservation areas where planning regulations require a like-for-like product replacement.
Alitherm Heritage door profiles feature the system's signature slim sightlines and elegant lines that complement Smart's existing Alitherm Heritage window and mimic those of steel doors.
The system has all the advantages of modern aluminium profiles that feature polyamide thermal breaks, allowing the system to achieve a Window Energy Rating of C (WER C) under the latest tougher June 2022 (Document L) building regulations when installed with our high specification double glazed unit.
Single or double external heritage doors
Open out or open in
Available with fixed side and top lights
Window Energy Rating of C (WER C)
Individual 24mm toughened double glazed units
Gasket glazed system
Multipoint locking with Avocet ABS cylinder
Traditional handle range and finishes
Made to measure design options
WHY BUILD A SOLID WALL WHEN YOU CAN HAVE A GLAZED PARTITION?
Interior glazing system for screens and room dividers using ultra slim aluminum steel-look framework.
...trumps the steel-type systems on thermal performance and cost.
The grasp of the importance of design and quality of manufacture from the Marlin Team is second to none.
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.
Section identification Guide
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Supply only – Guide to installation
Read our guide to listed building window replacement
Read our buyers guide to the best Alternatives To Steel Windows and Doors
Read our guide to conservation area property window replacement