Customise to your own requirements and preferences

Solid timber core composite door

Our composite doors come in a selection of traditional and contemporary styles, which you can personalise with your choice of colour and finish.

We understand the importance of security when choosing a new door, which is why all composites are fitted with the unrivalled Ultion locks and a £1,000 guarantee if compromised.

You’ll also find a whole host of beautiful accessories to enhance your chosen design, giving your door a truly bespoke feel.

Design your own door here Download Brochure

Ultion locks come as standard and FREE on all Firmseal Composite Doors…

Design your own Solidor Composite Door with our dedicated Door Builder.

Select your ideal door style and colour, add the fixtures and fittings of your choice, then submit your design for a free no-obligation quote. 

Submit your design into the door builder below and we will honour your quote for 12 months, ensuring that you aren’t affected by any imminent price increases during that period. It is well known that we are a zero-pressure company, and as such we will not pester you and you are under no obligation to complete an order.

The Firmseal process

We pride ourselves on offering the very best experience for our customers throughout every stage of the process.
Known fondly as the “Firmseal experience".

From quote to installation, we make it easy for you!

"We had dealt with Firmseal in the past. Came over and looked at showroom, was impressed, staff so helpful, everything went smoothly from start to finish. So nice to get to speak to a person at the end of the phone. Thank you to everyone."

Mrs M – Windows, Yeovil







Case Studies

Before & After Collection

See how our doors can transform any entrance!


What our customers say

Don’t just take our word for it. Hear what our customers have to say!

Excellent product & better value for money than competitor brands. Customer service has also been very impressive. We love our new windows.

Mr & Mrs T

Alitherm, Yeovil

Completely satisfied, you came recommended by my sister who has had various work done by yourselves.

Mrs C

Back Door, Yeovil