You've probably seen the ads. "Best prices." "Fastest installation." "Premium quality."
But six months later, the drafts start. The condensation appears. The locks feel loose.
We've spent fifteen years fixing what others got wrong. And what we found changed how we build everything.
Most failures don't happen in the product. They happen in the details no one sees.
Your home's security starts where others cut corners.
Three years ago, we made a decision. Instead of being the cheapest option, we became the option that actually works.
We source from manufacturers who don't sell to retail chains. We train our installers for three months, not three days. We warranty the installation itself, not just the product.
Across Greater London, Surrey, and Kent since 2009
Our installation quality eliminated post-install issues
We guarantee both product and installation integrity
"I had three quotes. Two were cheaper. But when Marquess showed me the difference in their locking system and explained why standard hinges fail, I understood. Two years later, my neighbour's new windows are already showing issues. Mine still feel brand new."— Rebecca T., Wimbledon
Not a product catalogue. A complete security transformation.
We measure thermal bridging, test existing frame stability, and identify structural issues before we quote. Most companies measure the opening and leave.
This alone prevents 80% of future problems.
Our installers don't rush. They seal every junction point, adjust for building movement, and test every lock mechanism under load.
You shouldn't notice your windows and doors. That's how you know they're working.
We use PAS 24 certified systems with upgrade options to Secured by Design. But more importantly, we install them correctly—which most certified installers don't.
Each service includes full survey, installation, cleanup, and 15-year warranty.
Multi-point locking, A+ energy rating, reinforced frames
Solid core, multi-layer security, insurance-approved
Slim sightlines, maximum glass, weatherproof tracking
Classic design, modern security, dual opening
VELUX premium, leak-proof flashing, remote control
Period features, modern performance, conservation-approved
We limit installations to 12 per month to maintain quality. May and June slots are filling rapidly.
We'll assess your property and provide a no-obligation quote with exact specifications.
✓ No deposit required until survey confirms viability
✓ Installation dates locked in writing
✓ 15-year warranty on materials and workmanship
✓ Full cleanup and disposal included