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Masterdor Limited was established in 2014 when Synseal Group bought the assets of the door business based at Nether Heage in Derbyshire.

With an investment of £1.5 million, Synseal Group has transformed Masterdor into one of the UK’s best known door brands, working with housing associations, councils and new build developers across the UK to provide secure yet stylish entrance door solutions.

The company’s flagship products – Masterdor engineered timber doors and Suredor GRP composite doors – are two of the most highly specified entrance doors in the UK, and have been designed to offer specifiers a wide choice of colours and style without compromising quality, security and longevity.

In 2018, Masterdor launched Warden Fire Doors, the first timber fire doors in the UK to be comprehensively furnace tested on both sides to 2018 British Standards. In response to the findings of the Hackitt review, Warden Fire Doors are only sold with a valid 2018 test report for your exact specification.


Masterdor quality icon

Every door that leaves our premises is made to order, and all Masterdor doors are individually inspected for quality and packaged by hand before reaching our customers.

Masterdor traceability icon

We work closely with suppliers to encourage greater use of certified timber products, and can trace the components we use all the way back to the source.

Masterdor safety icon

Our door sets are manufactured to meet the highest standards. We are proud to produce products that are compliant with Secured by Design, and all Warden Fire Doors are tested on both sides.


All our products are tested to British Standards and we are proud to be an ISO 14001 certified manufacturer. To view our full accreditations, click on the logos below.

BSI accredited company, Masterdor
FSC approved manufacturer, Masterdor
Secured by Design approved manufacturer, Masterdor
Recognised by the Guild of Master Craftsmen, Masterdor
FENSA registered company, Masterdor
Constructionline member, Masterdor
CHAS Accredited Contractor, Masterdor
Alcumus safe contractor, Masterdor
ISO 14001

Our People

Philip Seath, Managing Director of Masterdor Limited

Philip Seath

Managing Director

Phil joined Synseal Group in 2018 to bring a new direction to the leadership at Masterdor Limited. As managing director, he holds responsibility for all aspects of the door business, and is also a key member of the Board of Directors at Synseal Group where he contributes expertise in manufacturing, operations, sales and strategy.

Robin Harrison, Technical and Quality Compliance Manager at Masterdor Limited

Robin Harrison

Technical and Quality Compliance Manager

Robin joined Synseal Group in 2016 after a 10-year career in the automotive industry. Robin has a vital role monitoring the finer details at the Masterdor factory, ensuring every door that leaves site is manufactured to meet our stringent standards.

Debbie Hicks, Business Development Manager at Masterdor Limited

Debbie Hicks

Business Development Manager

Debbie has worked in the window and door industry for more than 30 years, predominantly within the social housing sector. Debbie offers support to clients in the north of the UK, providing specification information, forging relationships with contractors and installers, and ensuring customers are fully satisfied with their products.

Chris Higginson, Business Development Manager at Masterdor Limited

Chris Higginson

Business Development Manager

Chris joined Masterdor’s sales team in 2018 and offers support to clients in the south of the country. He has years of experience within the industry across many product groups and routes to market, with a deep understanding of the need for fire-critical products.



door sets manufactured every year


million pound investment in our facilities


members of staff

Full traceability icon

Full Traceability

From the moment we receive your order, we offer full traceability throughout the manufacturing process and offer historical tracking so you know everything you need to know about your doors, at any time.

Find out more
10-year guarantee icon


All of our products come complete with a 10-year guarantee covering the door blade, glazing and frame. Thresholds are covered by a five-year guarantee and our hardware products vary, depending on the manufacturer’s warranty.


Whether you have a project in mind or would like further information about our product range, the Masterdor sales team are here to help.