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Welcome to 3 Shires Glazing
Olney’s windows & doors company

01234 712242 or 01908 980068

  • 3SG of Olney, Buckinghamshire are a leading independent window, door, conservatory and roof system company, who work with domestic or commercial clients.

    See what we do
  • A Helpful, Friendly Team.

    We’re local and pride ourselves on working to make homes in Buckinghamshire looking great.

    About Us
  • Replacement Windows and Doors.

    A wide range of stunning replacement windows and doors, including bi-folds.

    Find out more

Replacement Doors, Windows, Conservatories & Thermally controlled roof systems

We’re a friendly, knowledgeable and honest company providing windows, doors, conservatories, warm & smart roofs and much more, from our base in Olney, Buckinghamshire. Our product range includes:

  • uPVC Double glazing
  • uPVC Security doors
  • Bi-folding doors
  • Tilt & Turn windows and doors
  • Conservatories
  • Thermally controlled roof systems
  • Window, door and conservatory repairs
  • Glass Splashbacks
  • Sash Window works, locks and replacements
  • Misted units replaced
  • Security upgrades
  • Composite and solid doors
  • Aluminium, wood and composite frameworks
  • Traditional face putty works undertaken


The double glazing industry has a bad name for pushy sales and confusing prices, but our ‘straight-up’ pricing is highly competitive without hidden or inflated costs. If you’d like us to come and see you then one of our experienced team, will run through what you need and suggest the best windows, door or conservatory based on what’s right for you and your home.

We also provide smart roof replacements, so if you find your existing conservatory is too hot in the summer or too cold in the winter, then we can create an all year round usable space with a Thermally controlled smart roof. These often change how people use their homes and customers find they have an extra room for entertaining or relaxing. They can also potentially increase the value of your home.

With nearly 20 years of experience 3SG have worked with too many local clients to list, providing new windows, doors and conservatories throughout Olney, Buckinghamshire and Nationwide. The company has an unrivalled reputation in the window industry for reliability, honesty and getting the job done to a high standard.

All services
  • “3SG has done high quality work for us over the past ten years, they have always been very trustworthy, competent & competitive.

    In their work, no job was to small or large for them. I would not hesitate to recommend them to anyone else.”

    Mark Hone, Bedford Hospital NHS Trust
  • “Thank you so much to Three Shires for our beautiful back door and our number glazed above our front door. They took great care to ensure we chose the best door for our needs, showing us loads of ideas and images of previous work. We left them to choose how the number above the front door would look and it’s perfectly in keeping with the property. All in all excellent and very professional service from the moment we contacted them for a quote to the installation and after care. Will definitely use them again.”

    Philippa Graham
  • “We used 3SG to upgrade the old conservatory roof / windows after moving into our new house this year. We have an open plan kitchen / conservatory which was unable to be used as was just too hot in the summer due to the plastic roof. 3SG offered a competitive quote for replacing the roof with a warm roof as well replacing the doors/windows to meet building standards.

    The team were extremely friendly, professional and worked hard to ensure work was completed within the agreed timeframe. We are very happy and can actually use the space now as it was intended. I would highly recommend 3SG.”

    Happy customer in Lavendon
  • “We regularly use 3SG to carry out window and door maintenance. They are very responsive and are able to help resolve issues effectively.”

    Graham Busch, Bedford Housing Association
  • “Having used 3 Shires Glazing several times now I can say every time I have been extremely happy with their service, product & efficiency. No hesitations in recommending them to others as I know they will be equally happy.”

    Natalie, local customer in Olney
  • “I am very happy with the service that I receive from 3 Shires Group. I find them to be very helpful and accommodating even when needing help at short notice. I would highly recommend 3 Shires Group.”

    Victoria Grigg, Eastvillage Management
  • “I have been using 3 Shires Glazing for over 5 years within the hotel industry. They are very efficient and extremely reliable. Within the hotel things need to be fixed quickly with a professionalism to the surroundings you are working in, the 3SG fitters cover all of this.”

    Nigel Taylor, De Vere Horwood Estate

More testimonials

Window company


  • Free written quotes and advice
  • Local highly regarded window company
  • Simple, honest pricing
  • No pushy sales people
  • Guaranteed work
  • FENSA approved
  • Guardian warm roof approved
  • Full public liability insurance
  • Commercial and domestic window repairs
  • No job too big or too small
Safe contractor logo fensa window certificate Guardian warm roof logo Guardian smart roof logo
Replacement Windows, Doors & Bi-Fold Doors

Replacement Windows, Doors & Bi-Fold Doors

Many people see the value in replacing their existing windows and doors, for a more energy efficent, higher security rated, durable and virtually mainteanace free option.

Replacement Glass & glazing

Replacement Glass & glazing

We can supply and fit all types of glazing and double glazing, complete windows with frames or just the glass, wood, uPVC or aluminium windows and doors. Whatever your requirement we’ve got it covered.

Window & Door repairs

Window & Door repairs

We also specialise in structural repairs including suppling and fitting replacement parts such as new window and door handles, window and door locks, also window and door hinges, which means we are able to repair many window frames rather than the more costly option of replacing them.

Thermally controlled roof

Thermally controlled roof & Guardian Smart Warm roof

With the Guardian warm roof system you can change your old conservatory roof for a new one effectively turning your old conservatory into a new extension that can be used all year round. The complete changeover only takes days with minimal disruption to your household.


Contact Us

Call Us

01234 712242

01908 980068

Where we are

Three Shires Glazing,
48 Elmlea Drive,
Olney, MK46 5HX