Traditional look with stormproof performance


Our traditional looking double sealed window offers customers a traditional look while allowing for an espagnolette locking system and double seals which gives it a much higher performance compared to the traditional casement window. The windows performance is also superior to a stormproof window.  Designed by JM Joinery, in 2010, the double seal window's low U-value and energy saving features are fast making it the most popular window in our range.  Below are a few images to help you understand and get familiar with the system.


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This image shows the cross-section of the casement and frame.  As you can see the casement still finishes flush, like a traditional window, but when the window is closed it compresses on two separate seals.  We also fit a head drip above the casement to ensure no water can work its way under the head of the frame and put pressure on the seals or sit on top of the casement. 

The double seal window is an extremely secure and safe window to own.  The espagnolette window locking system allows you to have a 3 point lock in comparison to a traditional window single lock.  Due to the double seal window being flush finishing it is also more secure than a stormproof window which offers itself to being levered open by a bar. 

The espagnolette locking system also allows for a night vent and child restriction opening hinges.

Handmade Bespoke Joinery Hereford Carpentry Carpenters Hardwood Oak Windows Doors Kitchens Stairs

High performance

We want to make sure that the windows we make have the best performance possible, so we take extra steps to protect them.

All our windows are treated with end grain sealer to prevent any moisture being drawn up into the timber.  We also drill weep holes in the glass rebate, to allow any moisture to be released, preventing glass breakdown and to avoid water sitting on the surface of the wood for too long.  These are just a few of the steps we take to ensure the life of our windows is as long as possible. 

Handmade Bespoke Joinery Hereford Carpentry Carpenters Hardwood Oak Windows Doors Kitchens Stairs

Energy saving

Our windows can be glazed with both double glazed and triple glazed units.  We supply U-value certificates to all our window customers which state the energy efficiency of each individual window.

It's your choice 

We love to be as helpful as possible from the first time you call, to the point of delivery of your joinery, that's why we offer different options to make sure all your needs are taken care of. 

We have a range of moulds for you to choose from when designing your windows, different finishing options including fully finished spray coating system, oil and stained.  A range of delivery options including fully wrapped and delivered to site and the choice for us to fit your joinery.  We want to make sure we cater for all your needs throughout the job.

The rest of our window range!

We offer more than just our double seal window as we understand that isn't for everyone.  We also make traditional, stormproof, box sash and spring balance sash windows to the same high standard as the double seal.  We have example windows at our workshop for you to see and compare. 

“From patient advice and multiple (and competitive) quotations to help us make our choices, JM Joinery went on to construct beautiful custom made hardwood windows and doors for us, which were installed without fuss or mess by the cheerful team. Aftercare has been superb, adjustments made promptly and effectively. We will certainly use JM Joinery again and we recommend them to you. You may find cheaper, but you won’t find better!”
— Paul & Melissa Savage
“We are delighted with the quality of the work with regard to our windows. The workmanship is excellent. In addition, communication with JM Joinery has also been reliable and after sales service also very helpful. We would definitely recommend the company.”
— Richard & Ellen Green, Little Birch
“We are grateful for all the work you have done to ensure the work went well and also to the team who came to fit the windows and doors. They worked hard and were a pleasure to have around”.
“Thank you for producing and fitting such good quality oak joinery for the replacement windows and doors to our barn conversion. Your company has been professional and friendly throughout the whole process. The itemised quote ensured there were no ‘grey’ areas and everything was all agreed. The joinery is made to a very high standard and fits the existing openings exactly as it should. Your fitter was extremely conscientious and ensured that everything was to our satisfaction. Once again a big thank you and I will be sure to get in touch when I require any further joinery.”
— Neil Hipkiss