We use only high-quality, traditional-style hardware that enhances security while blending seamlessly with Victorian, Georgian, and Edwardian window designs.
Sash Locks & Keyed Stops
Our most popular security enhancement, these lockable sash stops prevent your window from being opened past a certain point. They’re ideal for ground floors, street-facing rooms, and child safety—without visibly altering the look of your sashes.
- Available in brass, chrome, antique black and other finishes
- Insurance-approved and easy to use
- Suitable for both new and restored windows
Secure Restrictors
Fitted to limit window opening, these non-locking restrictors provide passive security and ventilation safety—perfect for upper floors and family homes.
Reinforced Fittings & Hardware
We install heavy-duty sash lifts, fasteners, and catch bolts that offer greater resistance to tampering. All fixtures are carefully chosen to complement period styles and timber types.
Laminated & Toughened Glazing

For added strength, we can install laminated glass that holds together if shattered—making forced entry much harder. Toughened glass is also available for vulnerable areas and required under safety regulations in low-level panes and doors.
Cord & Pulley Protection
We offer internal security upgrades, including reinforced sash cords, secure housing for weights, and sealed access hatches to reduce manipulation risks in traditional box frames.
Sensitive Security for Heritage Homes
We understand that security enhancements must be sympathetic to heritage architecture. That’s why our fittings are:
- Discreet and in keeping with traditional joinery
- Approved or recommended for listed buildings
- Non-invasive and fully reversible where required
- Fitted by trained joiners with care and accuracy
Whether you’re working under English Heritage guidance or simply want to preserve your home’s original character, we provide solutions that protect your home without compromising its story.
Combine with Repairs or Upgrades
Security enhancements often go hand-in-hand with:
- Sash window repairs and frame strengthening
- Single to double glazing upgrades
- Draught proofing and cord replacements
- New or bespoke timber sash window installations
We’ll inspect your windows and suggest a package that balances preservation, protection, and performance.
Secure Your Sash Windows—Without Compromising Style
Your home should feel both safe and beautiful. With Cavendish & Cole, you don’t have to choose between the two. Our sash window security solutions are designed to keep your property secure while staying true to its period character.
Want to upgrade your window security?
Contact us today to arrange a consultation. We’ll review your current setup and recommend smart, stylish solutions that make your home safer—without a single compromise on craftsmanship.
Get in touch today for a free consultation. Let’s bring your vision to life—beautifully, traditionally, and made to last.