Secondary Glazing
Discreet, efficient secondary glazing for warmer, quieter homes.
Wessex Timber Windows are pleased to be able to work with Granada Secondary Glazing who offer a wide range of bespoke aluminium secondary glazing, made to measure and featuring strong, slim and unobtrusive aluminium profiles.
Granada secondary glazing offers a sensitive and effective way to improve energy efficiently, reduce noise and retain the original character of your windows, especially in listed and period properties where standard double glazing may not be permitted.
Fitted by our skilled local craftspeople, our timber secondary glazing solutions blend seemlessly with your existing windows while delivery a noticeable improvement in comfort and performance. As a family-run company for over 20 years, we’re pleased to provide high-quality glazing solutions across Wiltshire, Dorset, Hampshire and Somerset.
We are specialists in listed buildings, working in all types of buildings from conservation areas to modern homes.
Benefits of Secondary Glazing
- Ideal for listed buildings – complies with strict conservation requirements
- Improved energy efficiency – reduces heat loss and draughts
- Excellent acoustic insulation – helps keep out traffic and environmental noise
- Preserves original windows – no alteration to external frames or glass
- Slim, discreet appearance – designed to blend naturally with existing joinery– keeps internal glass surfaces warmer
- Custom-built – made to fit your exact window shape, style and proportions
We design, manufacture and install
- Aluminium secondary glazing – slim, robust and tailor-made
- Lift-out units – convenient and removable for cleaning
- Hinged secondary glazing – ideal for casement and cottage windows
- Vertical sliders – perfect for sash windows
- Acoustic secondary glazing – enhanced noise reduction for busy locations
Suitable for:
- Listed buildings
- Conservation areas
- Period cottages
- Townhouses
- Homes where replacement glazing isn’t an option
Window Types
Horizontal Sliding
Vertical Sliding
Lift Out
Hinged
Acoustic Performance
Secondary glazing has been proven to be the most effective method of acoustically insulating existing primary windows, with weighted sound reduction indices of up to 54dB.
The essence of effective acoustic secondary glazing is based on the following:
- The optimal cavity between the primary & secondary glazing is 150mm – 250mm
- The difference in glass thickness between the primary & secondary should be circa 50%; 4mm primary, 6.4 secondary
- In particulary onerous case the cavity can be lined within an acoustic absorbent material, i.e. 15mm high density fibre board
Thermal Performance
Another principal reason for the use of secondary glazing is to enhance the thermal performance of buildings. A typical single glazed primary window will achieve a u value of around 5.7w/m2K. By the use of low emissivity glasses we can improve u values to around 1.868W/m2K, and even further by utilising a double glazed sealed unit beyond to a staggering 0.6W/m2K.
This improvement demonstrates compliance with both Approved Document L: Conservation of Fuel & Power and BS 8233:2014 Guidance on sound insulation and noise reduction for building.
Explore our product range
Our process
Craftmanship, clarity and care from the first call to the final fitting.
Working with Wessex Timber Windows means dealing directly with the people who make and restore your joinery. Our family-run team manages every stage in-house to ensure quality, consistency and a personal touch.
Initial conversation
Get in touch to discuss your requirements.
Free consultation and home visit
We assess your existing windows and outline repair or conservation options.
Detailed quotation
Clear, itemised and transparent.
Drawings and permissions
Listed building drawings prepared if required (additional charge may apply).
Final measurements or repair assessment
Once you’re ready to proceed, we confirm all details and agree on timelines.
Handcrafting components
New cills, frames or glazing manufactured in our Wiltshire workshop.
Installation / repair work
Carefully completed by our own local, experienced craftspeople.
It’s a complete service built on craftsmanship, continuity and over 20 years of specialist timber window experience.
Case Studies
Explore our recent projects, from elegant Georgian townhouses to country cottages and listed restorations. See how our timber windows and wooden window replacements have transformed these buildings.
Our Story
Proudly family-run for over 20 years. Every timber window, door and wooden window frame is hand-built in our Wiltshire workshop and installed in homes across Salisbury, Dorset and Hampshire by skilled local craftspeople.
Areas we cover
We work with period properties, conservation areas and modern homes, delivering expert craftsmanship and a personal service.
Whether you're in a market town or countryside cottage, we bring over 20 years of experience in traditional timber joinery and restoration to your project.
Get in touch
Get in touch with our expert team to discuss your project.
