All installers are not the same
01325 720 000
Hurworth Grange, 41 Hurworth Road, Hurworth Place, Darlington, DL2 2BN

Fortress™ Internally Beaded Windows


Fortress™ 70 are amongst our most sought-after windows and we have supplied and fitted them for customers across the north east. The windows combine state-of-the-art design with exceptional security featured as well as the highest standard of engineering work. They are ideal for anyone looking for a robust take on a classic, traditional style and you can get in touch with us at any time if you have any queries about them. 

Like the Super Fortress™ range, Fortress™ 70 offer timeless style with unrivalled innovation and build quality. The windows offer a fully-chamfered outer frame, sash and glazing bead. They can enchance the appearance of virtually any home, inside and out. They feature low sightline grey weather seals plus a multi-chambered construction. What's even better is that they provide a robust barrier against the testing British climate whilst keeping heat trapped inside your home and diminishing the amount of noise that enters the home from the outside. 

The windows can enchance the value of your home and improve your quality of life. At Oaktree, we can offer you in-depth advice on all of our products to lead you to an informed decision. As a premier supplier and installer of some of the market's most renowned windows, we can be relied upon to meet your expectations whilst offering you some of the best prices in the north east. Talk to us today to learn more about Fortress™ 70 windows in Darlington and surrounding areas. 

Checkatrade information for Oaktree Windows Ltd

2017 (3)

2016 (1)

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Customer Testimonials

Thanks to everyone for a great job. We're delighted.”

Mr. & Mrs. Booth

Competitive price excellent product and workmanship. Company boss involved from start to finish. Highly recommended.”

Mr Hunter

New windows, conservatory roof, new utility "Reliable, clean, quick and excellent follow up service"”

Mrs Davies

"Front door designed to my requirements and fitted. Excellent from the initial quotation and design to the fitting, fabulous friendly service, very professional company"”

Mrs Crawford - Stockton on Tees

I would very much appreciate it if you could pass on my thanks to everyone, from Neville in the 1st instance for his advice, guidance and expertise to the fitters who were amazing. The windows look fabulous, the patio doors look fantastic and the bi-fold doors are stunning. Great job from start to finish, thank you.”

Miss J. Lowes

Great windows for a sensible price clean workers recommend anytime”

Mr M. Young - Eaglescliffe

Fantastic job, work is super a really good job.”

B Hope Chester-le-Street

Great job from start to finish, fitters are a credit to the company. They even had there own hoover to clean up after! ”

Mr.G.Hall - Darlington

Good professional job! The windows look great”

Mr R. Evans

Fantastic windows and service, I highly recommend Oaktree for your replacement windows, Doors and conservatories.”

Mr N. Campelle

Such a pleasant building experience. The workmen were very efficient, polite and hard working. My windows look fantastic.”

Mr C. Eastwood - Newcastle Upon Tyne