Composite Doors Scunthorpe

Who We Are

Highseal Manufacturing is an independent manufacturing facility based in Scunthorpe, North Lincolnshire. Part of the Fair Share Group which established in 2012 we offer a comprehensive range of PVC-u, aluminium products to include windows & doors, conservatories and roofing structures. In addition other home improvement products to the trade and domestic markets are available.

Established in 2012 Highseal has seen growth year-on-year to get us to where we are today. Working from our Scunthorpe base, Highseal has an increasing number of associate traders, installers and blue-chip clients nationally.

Most importantly Highseal is committed to quality and excellence. To help us achieve this we operate under both the CE Marking and BSI (BS 7412/ PAS 24) Kitemark accreditation which helps us meet the Approved Document Q requirements. .

Focused on our clients' needs we continuously strive to deliver a friendly but professional service. Our clients needs are always our priority. Sustainability is also important to us, so we invest in the development of our products to ensure alignment with current regulations and energy technologies.

Trade supplier

New build homes: self builders and major house builders, spec builders and extensions

Retail home improvements

Commercial work: factories, schools, glazed roofing, conversions and domestic applications


  • Terms and Conditions of Sale
  • Highseal Warranty
  • Manufacturing Parameters
  • The Maintenance and Cleaning of Glass
  • Visual Quality Standards and Guidelines for Glass Units

Meet the Team

Quotes / Orders

Neil Donaldson

Former Managing Director

Neil joined the window and door industry in 1986. Coming from a background in manufacturing, production and general management, Neil worked in all areas of the industry and decided to set up his own company in 1992. Great service and high quality have remained at the heart of Highseal. Neil firmly stands by the belief that diversity and originality will continue to enhance the Highseal brands.

Unfortunately Neil passed away 5th April 2019 but the company continues to trade for its loyal customers and hardworking staff. The legacy of Neil will remain through everyone’s memories and the successful business he has created today.

Sue Donaldson


Sue has worked in the fenestration industry since the eighties. Dealing with estimating, order processing, customer services and accounts she has a handle on all things Highseal. Sue handles the day-to-day financial processes for Fair Share Group Ltd along with overseeing a highly effective customer service and after-sales service team. Sue was the Company Secretary and supported Neil in growing the business and its brands. As a result of Neil’s passing Sue is now the Managing Director of Highseal.

Like the rest of the family, Sue is a “person’s person” along with recognising the need for quality, attention to detail and fairness which she believes are synonymous with business development.

Holly Donaldson

Senior Administrator

Holly, the daughter of Sue and Neil, commenced employment with the company officially in 2016. However she was introduced to the family business from an early age and supported her parents by helping in the office during school holidays. Holly studied BA (Hons) Degree in Business Management at the Open University in Hull and graduated in May 2018. Holly hopes that by shadowing her parents she will learn the Highseal business inside and out.

Furthermore Holly is young and ambitious, and has a strong understanding of the power of social media. As a result she brings a unique loyalty to the business and has enviable drive in the pursuit of its success. Holly enjoys interacting with her colleagues and clients, and brings a sense of fun to the company.

Jason Ashton

Operations Director
Jason started in the fenestration industry with Highseal manufacturing in 1998. He gained experience over the next 21 years in service work, installations, surveying and project management. After that he returned to Highseal January 2019 as Operations Manager. As a result to oversee the progression and management of the growing business. Although Jason is very work focused, he has a keen passion for aviation and is working towards his private pilot’s licence. Above all Jason was promoted to Operations Director May 2020 to help Sue to oversee the business.

Adam Jackson

Office Manager (Aluminium Products)
Adam has been working in the industry since he left school in 2003. Firstly he started at Highseal in 2004 as a roofing fabricator. Then in 2006 he moved into the office and dealt with order processing. Adam has been with Highseal ever since and has now become Office Manager for our aluminium line. As a result Adam has a wide range of knowledge in the industry to deal with PVC and aluminium. Most importantly Adam is a friendly character, driven & extremely efficient so is a credit to our team.

John Longden

Senior Manager (PVC Products)
John has been in the window industry since 1998. He joined Highseal in 2001 working as a Cell Leader. Since then he has had various job roles within the company. As a result this makes him experienced and knowledgeable within the industry. Consequently John has worked his way up within the company to progress to Senior Manager of PVC Products. In conclusion John is a key part of the team, delivering tasks such as; project managing and liaising with clients on a daily basis and purchasing stock for the company.

For quotations and / or orders for our
Highseal brand of products please contact us.