Bespoke Glazed Extensions Across Southern England

5 Key Benefits of Glazed Extensions

• Boost Natural Light
Our high-performance glass floods interiors with 70% more daylight than standard windows, reducing reliance on artificial lighting while creating airy, inviting spaces.

• Expand Living Areas
Convert underused gardens or side passages into functional spaces – perfect for home offices, dining areas, or tranquil retreats.

• Increase Property Value
Quality glazed extensions can enhance home values by up to 15%, making them a strategic investment for future sales or remortgaging.

• Year-Round Comfort
Advanced thermal control systems maintain temperatures between 18-22°C year-round, even during frosty winters or summer heatwaves.

• Energy Efficiency
Low-E glass coatings and argon-filled units reduce heat loss by 30% compared to single-pane windows, lowering energy bills.

Precision Craftsmanship for Lasting Results

Structural Excellence

Our glazed extensions use:

• Laminated safety glass capable of withstanding extreme weather

• Thermally broken frames that prevent cold bridging

• Self-cleaning glass options with hydrophilic coatings for low maintenance

Tailored Design Process

1. Free Consultation – Our experts assess your space and discuss ideas

2. Planning Support – We handle building regulations and council submissions

3. Swift Installation – Most projects completed in 6-8 weeks with minimal disruption

Why Homeowners Trust Sherborne Windows

Three Decades of Local Expertise

Since 1995, we’ve installed 1,200+ glazed extensions across Southern England, from Victorian terraces to modern new builds.

Comprehensive Service

• 10-Year Guarantee on all structures
• Aftercare Program including annual sealant checks
• Financing Options with flexible payment plans

How much does a glass extension cost?

The cost of a glass extension will depend on a few factors. The size of the area you would like the glass extension to be on, the larger the extension the more exspensive. The material you want to use for the conservatory and the style choices.

Its always best to speak to an expert to get an accurate quote and overview of all the options.

Are glass extensions cold?

No, glass extensions are not cold. Glass extension made from modern materials are very thermally efficient which means they are cheaper to heat and dont let the cold in. This means you can use your glazed extension all year round.

Do you need planning permission for glass extensions?

Normally you do not need plannig permission for glass extensions. The basic limits you can build to before needing plannig permission is that the extensions should not take up more than hald the area of land around the home. However it is always best to ask a local expert and check your planning rules in the local area just to make sure you are within the limits.