Commercial manufacture and installation of uPVC windows and doors

Serving London and the South East

Exterior Plas specialises in manufacturing and installing affordable, high quality, energy efficient, secure windows and doors for Commercial, Educational and Residential properties across London and the South East.

Established for over 30 years, Exterior Plas is a family run company with upwards of 70 employees. Historically our expertise has been with local councils, housing associations and the educational sector, however we also carry out domestic works and deal with the trade market.

Offering to work as either a main contractor or sub-contractor, we can take care of any requirements from acting as RLO to fully managing the installations and handovers.

Unlike many of our competitors, who rely on a third party for their pre-fabricated windows and doors, we at Exterior Plas have our own extensive on-site manufacturing facility with state-of-the-art machinery. This enables us to stock and cut all of our ancillary items in-house, which offers a quick turnaround for our clients. We also work on a bespoke software system that allows us to manage and update clients in real time, enabling us to produce completion reports on the same day.

Being a customer and service focused business, here at Exterior Plas, we have many years of experience working closely with our clients and providers to deliver an excellent service using the best quality materials to create tailored products designed and fitted specifically to your needs.


Exterior Plas provide bespoke windows available in a wide variety of styles, sizes and finishes.

We have a range of window materials available, including:
uPVC – We are proud to be associated with the Rehau brand, and fabricating windows and doors. Rehau have long been regarded as one of the industry’s leaders in uPVC extrusion. We believe that we offer our customers the best energy efficient product available in the uPVC market
Timber – Adding character and charm, high quality engineered timber windows and doors have always added value to a property, and for the discerning buyer are seen as an investment in their property. More and more homeowners, property developers and local authorities are rediscovering the benefits, and value, of engineered timber windows.
Aluminium – aluminium windows are renowned for being inherently strong and durable.  With a superior thermal performance and an aesthetically pleasing appearance, it means that aluminium is an incredibly high standard replacement to steel windows.


Constructed with high-grade materials, engineered for security and energy efficiency, Exterior Plas provide:

uPVC Doors – Manufactured using Calibre profile, these doors have a range of features including high performance handles, hinges and locking mechanisms. We manufacture, residential doors, french doors and coloured doors, which are completely compatible with Calibre Windows to have a seamless and complete look for your house or premises.
Composite – Traditional in appearance, yet with the performance and durability of a modern uPVC door, Exterior Plas are proud to be affiliated with Synseal and their Benchmark range of composite doors. With 11 colours, we can offer a wide range of energy efficient doors to suit all types of projects.
Bi-fold Doors – Bring the outside in. We offer an extensive range of both aluminium and uPVC bi-fold doors in an array of different colour options. We cater to any size and design to ensure your property looks its best.
Aluminium – aluminium doors are renowned for being inherently strong and durable.  With a superior thermal performance and an aesthetically pleasing appearance, it means that aluminium is an incredibly high standard replacement to steel.


Here at Exterior Plas, we are proud to provide the service of planning, creating and supplying our clients with bespoke specialist glazing projects.
These include:
Curved Glass and Domes – aesthetically pleasing, bent glass gives a uniqueness in architectural design.
Putty Glazing – a traditional glazing method, known for its immense bonding strength, smooth finish and tight seal that keeps away moisture.
Glass Walls – Enhance the view and bring the beauty of outdoors in. Glass walls allow more natural light to flow through your environment, creating an illusion of a larger, more-open space.
Stained Glass – Bringing beauty and uniqueness to a building, clear or coloured stained windows provide character and distinctiveness, giving that prefect personal touch.
Glass Floors – Glass floors add a stylish element to a commercial or residential property. Environmentally sound, glass floors increase natural light flow, creating the illusion of a more open space.


We at Exterior Plas offer an established repairs and maintenance service in and around the South East of England. Our dedicated repairs team at our Head Office are on hand to assist the client throughout the day with any updates or queries. Each client has an appointed engineer who will look after their contract. We offer the service of booking jobs for the client and can work with pre-appointed appointments. Each day our office based repairs team will update the client with the previous days’ activities using our bespoke software system that allows us to manage and update clients in real time. We can adapt to any kind of SOR code formatting and are happy to work with the client to create an efficient system that works for them.

EP Build Division

The EP Build Division was formed to provide building contractor services to the commercial, retail, industrial and residential sectors for maintenance, alteration and refurbishment commissions up to a value of £10m. The EP Build staff bring a wealth of knowledge and quality specialist contractors to provide first class advice and workmanship, delivering on time and in budget.  Service delivery is of paramount importance to us. From simple external redecoration works to alterations and refurbishments of offices and industrial units, no job is too difficult. From refurbishing A Listed c.1600 manor house to alteration and refurbishment of commercial units in London’s Mayfair, we are experienced in a variety of simple and complex schemes.