SGS Windows
SGS Windows is listed here as a window supplier serving the Teesside area. Customers give it 5 out of 5 from 15 reviews. It is positioned to cover Stockton-on-Tees, Billingham and Middlesbrough, along with the rest of Teesside. Confirm the warranty covers both the frames and the installation work, not just the product. Ask whether the installer is FENSA or CERTASS registered — you'll need the certificate when you sell the house.
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