VS
Venetia Shepherd
8 April 2021
✓ Recommends usSuch a brilliant and professional company. So good to deal with and the windows are really special — they have transformed our seaside cottage. Thank you so much!
A renovation or refurbishment project is one of the most exciting — and most demanding — things you can do to your home. Whether you're breathing new life into a tired Cornish farmhouse, adding an extension with aluminium bi-fold doors to the rear, converting a barn into a premium living space or undertaking a complete home transformation, the windows and doors you choose will define the finished result more than almost any other element. St Austell Bay Windows and St Austell Bay Plastics works with homeowners, self-builders and contractors across Cornwall on renovation and refurbishment projects of every scale. We supply and install the full range — from heritage flush casement windows sympathetic to period properties and conservation areas, to slim-profile aluminium bi-fold doors and sliding patio systems for contemporary extensions — all installed by our own in-house team with the same attention to detail on a single window as on a full home refit. We understand that renovation projects rarely run to a simple schedule. Our team is flexible, responsive and used to working alongside other trades — fitting around your project programme so glazing is never the thing holding everything else up.
Flexible Finance
Spread the Cost of Your Home Improvements
Make windows, doors and conservatories more affordable with monthly payment options — including no-deposit deals for qualifying customers.
- Flexible monthly payments
- No-deposit options available
- Quick online application
- Subject to status and credit checks
Yes. We supply flush casement and sash windows in woodgrain and heritage finishes that are sympathetic to traditional Cornish architecture and widely accepted in conservation areas and AONBs. Our team will advise on the most appropriate product and any planning requirements during your free home survey.
Yes. We regularly work with self-builders, architects and project managers on barn conversion and self-build projects across Cornwall — from initial specification advice through to final installation. Our aluminium range is particularly popular for barn conversions due to its slim profiles, structural strength and design flexibility.
Yes. We are experienced at phasing glazing installations to fit around live renovation projects — working alongside other trades and adjusting to programme changes as they arise. We will agree a clear installation schedule with you during the survey stage and communicate any changes throughout the project.
Yes. All window and door replacements must comply with current building regulations regardless of whether the property is a renovation or a new installation. Every installation we carry out is Certass registered, which provides full building regulation compliance and legal documentation without the need for separate building control notification. We handle all the certification — you receive your Certass certificate on completion.
Why Choose Us
Based in St Austell
We're Your Local Specialists. We're not a national chain. We live and work in the same area as our customers. When you choose St Austell Bay Windows and St Austell Bay Plastics , you're supporting a local family business that genuinely cares about its reputation.
Up to 10-Year Insurance-Backed Guarantee
Every window, door and conservatory we fit is backed by up to 10-year insurance-backed guarantee — not just a piece of paper, but a fully insured guarantee you can rely on even if circumstances change.
Flexible Finance Available
Spread the cost of your new windows or doors with our flexible finance options — including no-deposit deals. Making home improvement accessible for every budget in St Austell and surrounding areas. Subject to status.
Certass Registered
Every installation we carry out is Certass registered, giving you legal compliance, building regulation sign-off and full documentation. All our windows and doors meet Secured by Design standards for maximum home security.
In-House Fitters
Our installations are always carried out by our own trained, experienced team — never sub-contracted out. That means consistent quality, accountability and a finish you'll be proud of.
A-Rated Energy Efficient Products
All our double glazed windows achieve Window Energy Rating A as standard, with U-values as low as 1.2 W/m²K — keeping your home warmer and your heating bills lower all year round.
Step 1 - Free Home Survey
Step 2 - Your Personal Quote
Step 3 - Final Survey
Step 4 - Products Are Manufactured
Step 5 - Professional Installation
Covering St Austell & All Surrounding Towns
Honest advice, quality products and a finish you'll be proud of.
When you invest in new windows or doors, you want complete peace of mind — and that's exactly what we deliver. Every installation carried out by St Austell Bay Windows and St Austell Bay Plastics is backed by an insurance-backed guarantee of up to 10 years as standard.
That means your frames, glazing units, locks and workmanship are all covered long after our vans have left your driveway. Your installation is also registered with CERTASS for building regulation compliance.
Every installation is carried out by our own in-house team of experienced local fitters - and we never sub-contract. That means consistent quality, full accountability and a clean, tidy finish every single time.
From your free home survey through to the final fit and CERTASS sign-off, we manage the entire process ourselves. Most installations are completed within a day or two, with minimal disruption to your household.
