For child safety, choose a key-locking restrictor tested to the child-resistant standard BS EN 16281, and fit it so the window opens no more than 89mm. For fresh air and security, our Home Secure cable restrictor locks a window part-open and is our lowest-cost option. If you can't drill, our self-adhesive sliding restrictor limits the gap to around 7cm.
Window restrictors are small but powerful safety devices that every homeowner should consider. Whether you want to childproof your windows, improve home security, or simply allow safe ventilation, choosing the right restrictor type makes a huge difference.
In this guide, we’ll compare the three most popular types — cable, hidden, and key-locking window restrictors — to help you find the best fit for your home or business.
Not sure which fits your windows?
Email a photo of your window and frame to info@homesecureshop.co.uk and we'll tell you which restrictor fits and where to fit it.
| Feature | Locking Cable Restrictor | Home Secure Cable Restrictor | Sliding Window Restrictor |
|---|---|---|---|
| Our verdict | Best for child safety | Best for fresh air · Best value | Best no-drill option |
| Safety testing | Tested to BS EN 16281 | Not tested to a standard | Not tested to a standard |
| Customer rating | New | ★ 5.0 (1) | ★ 4.3 (3) |
| Restricted opening | Set by where you fit it | About 18cm | About 7cm |
| Fitting | Screw fix | Screw fix | Self-adhesive or screws |
| Price | From £14.99 | £6.99 | £8.99 |
| Shop | View | View | View |
Swipe the table sideways to compare.
Fitting restrictors for child safety?
The British Standard for window restrictors (BS EN 13126-5) limits a child-safety restrictor to an opening of 89mm. If you're fitting restrictors to stop a child falling, choose one tested to a child-resistant standard and check the gap once it's fitted.
If you mainly want fresh air and security, our Home Secure cable restrictor does the job. Many homes use both: a locking restrictor on upstairs windows a child can reach, and cable restrictors on the windows you like to leave open.
The Home Secure teamA window restrictor limits how far your window can open, keeping children, pets, and intruders safe. It allows air to circulate while preventing falls and unauthorised access.
They’re particularly useful for:
Families with young children
Apartments or multi-storey homes
Rental properties needing compliant safety measures
Anyone seeking added window security without replacing existing frames
👉 Explore Home Secure’s Bestselling Window Restrictor Here
A cable window restrictor uses a durable steel cable to connect the window sash and frame, restricting how far the window opens. This is the most affordable and versatile option available.
✅ Easy to install — perfect for DIY homeowners.
✅ Compatible with most window types (uPVC, aluminium, timber).
✅ Allows ventilation while maintaining safety.
✅ Child-safe models available — for child safety, choose one tested to BS EN 16281 that limits the opening to 89mm or less.
⚠️ Visible cable design may not suit all interiors.
⚠️ Requires occasional maintenance to prevent cable wear.
Best for: Homes with kids, landlords, and those seeking a low-cost safety upgrade.
For a trusted, tested option, try the Locking Cable Restrictor — child-resistant to BS EN 16281 and designed for maximum safety and convenience.
Our pick for child safety
Tested to the child-resistant standard BS EN 16281. From £14.99.
Hidden window restrictors (also known as concealed restrictors) are built into the window frame itself. They provide a clean, modern look with no visible parts when the window is closed.
✅ Completely hidden design — perfect for contemporary homes.
✅ Tamper-proof, offering lasting durability.
✅ Smooth operation and minimal maintenance.
⚠️ Higher installation cost — usually requires a professional.
⚠️ May not be suitable for older window frames.
Best for: New builds, modern apartments, or homeowners prioritising aesthetic and design continuity.
If you’re upgrading your home’s look, complement hidden restrictors with Home Secure’s Window Cable Restrictor for added security — ideal for locking windows part-open for airflow.
A key-locking window restrictor adds an extra layer of security with a lock-and-key system. This lets you control when and how far the window opens.
✅ Maximum control and flexibility — lock or unlock as needed.
✅ Ideal for landlords and multi-occupancy properties.
✅ Strong, reliable security — look for one tested to a recognised standard.
⚠️ Keys can be misplaced if not managed carefully.
⚠️ Slightly slower access compared to cable types.
Best for: Families, rental properties, or anyone needing high-security window restrictors.
For total peace of mind, choose the Locking Cable Restrictor — key locking, easy to install, and tested to the child-resistant standard BS EN 16281.
Lock your windows part-open for fresh air
Our key-locking steel cable restrictor lets air in while the window stays secure. £6.99.
Your Main Goal |
Recommended Type |
Key Benefit |
|---|---|---|
Child Safety |
Key-locking, tested to BS EN 16281 |
Prevents falls while allowing airflow |
Modern Look |
Hidden |
Clean, concealed design |
Flexible Access |
Key-Locking |
Can lock/unlock as needed |
Budget-Friendly |
Cable |
Affordable and easy to fit |
Professional Finish |
Hidden |
Sleek and durable |
🧠 Expert Tip: Combine Safety with Style
If you want maximum home safety without compromising design, consider mixing restrictor types throughout your property. For example:
Use hidden restrictors in living areas for aesthetics.
Install tested key-locking restrictors in bedrooms and upper floors for child safety.
Fit cable restrictors in garages or rental units for cost-effective protection.
And for more thorough health and safety advice, be sure to check out Tailored Safety Solutions for the latest on all things Health and Safety.
🏁 Final Thoughts
Choosing the right window restrictor comes down to your priorities: safety, style, or convenience.
Go with cable restrictors for an easy, affordable solution.
Pick hidden restrictors for modern, seamless window frames.
Choose key-locking restrictors if you need control and security.
Investing in quality window restrictors not only keeps your family safe — it also adds peace of mind and long-term value to your home.
See every restrictor we stock
Cable, sliding and key-locking restrictors for uPVC, timber and aluminium windows.
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