Sash Restrictors & Security

Sash Restrictors – safety and control for traditional sash windows
Sash Restrictors are a crucial safety feature for traditional sash windows, providing homeowners with control over how far a window can open. Whether you’re looking to improve child safety, comply with building regulations, or enhance security, Sash Restrictors offer a reliable and effective solution. At Sash Weights London, we supply high-quality Sash Restrictors that blend seamlessly with both period and modern sash windows—ensuring function without compromising aesthetics.
If you are restoring original timber windows, upgrading existing units, or installing new sash windows in family homes, schools, or public buildings, our Sash Restrictors offer the protection and peace of mind you need.
What are Sash Restrictors?
Sash Restrictors are window hardware devices designed to limit the opening range of sash windows. They are typically installed within the window frame or on the sash itself to restrict vertical travel. Sash Restrictors can be fixed or key-operated, depending on whether you want a permanent or temporary limit.
The primary purposes of Sash Restrictors include:

Enhancing child safety by preventing wide openings

Improving security by deterring forced entry

Meeting building regulations in residential and commercial properties

Reducing accidental falls from upper floors

Allowing controlled ventilation without compromising safety

Sash Restrictors ensure that your sash windows remain functional, yet safe—particularly important in family homes, apartments, rental properties, and heritage buildings with modern compliance requirements.
Types of Sash Restrictors
We offer a wide variety of Sash Restrictors to suit different sash window designs, materials, and safety requirements. Our product range includes:
1. Fixed Sash Restrictors
These restrictors limit the window opening to a specific measurement (usually 100mm or less). They are permanently installed and cannot be disabled without unscrewing or removing the unit. Perfect for high-traffic areas or buildings where safety must always be enforced.
2. Key-Operated Sash Restrictors
Our most popular type, key-operated Sash Restrictors allow the user to temporarily override the restrictor when full access is needed (for cleaning, maintenance, or emergency egress). Once the key is removed, the restrictor returns to its locked position.
3. Concealed Sash Restrictors
These are discreetly fitted into the frame or sash to maintain the original appearance of period windows. Ideal for conservation areas or listed buildings where visible hardware is not desirable.
4. Surface-Mounted Sash Restrictors
Easier to install and more versatile, surface-mounted Sash Restrictors can be fitted to most existing sash windows. They are a cost-effective option for improving safety without invasive carpentry.
All of our Sash Restrictors are made from durable, corrosion-resistant materials such as stainless steel, brass, or zinc alloys, and are available in various finishes, including polished brass, satin chrome, antique black, and white enamel.
Why install Sash Restrictors?
There are many good reasons to install Sash Restrictors in your property. These include:

Child Safety: Prevent children from opening windows wide enough to fall out. Sash Restrictors help parents comply with child safety guidelines in homes, nurseries, and schools.

Security: Limit how far the window can open to reduce the risk of forced entry. Sash Restrictors are a discreet but effective addition to your home’s security system.

Compliance: Sash Restrictors help property managers and landlords meet legal requirements for rental and multi-occupancy buildings.

Insurance: Some insurance providers require Sash Restrictors to be fitted in properties with accessible sash windows.

Ventilation Control: Allow windows to remain open for airflow while restricting access—ideal for warmer months when you want breeze without compromising safety.

Easy Installation and Compatibility
Our Sash Restrictors are designed to be easy to install, even in existing or period sash windows. Each product comes with installation instructions, and we also offer technical support if needed.
Most of our Sash Restrictors are suitable for:

Timber sash windows

uPVC sash windows

Single and double-hung sash designs

New builds and restoration projects

Whether you’re a homeowner, joiner, or contractor, our Sash Restrictors are designed to integrate seamlessly into your project.
Sash Restrictors for period and heritage windows
If you’re working on a listed building or a heritage home, you’ll want safety features that don’t compromise the window’s traditional charm. Our concealed or antique-finish Sash Restrictors are perfect for this purpose. They are subtle, elegant, and compliant with conservation guidelines while providing modern safety standards.
We have supplied Sash Restrictors for numerous high-profile restoration projects, ensuring that classic aesthetics and safety go hand in hand.
Key features of our Sash Restrictors

Made from durable materials that resist wear and corrosion

Available in a range of finishes to match other sash hardware

Easy to install with basic tools

Reversible or permanent options

Compliant with UK building regulations

Suitable for single- or double-glazed sash windows

Designed to work with all standard box sash configurations

Reliable performance and smooth operation over time

Trusted by professionals and homeowners
Our Sash Restrictors are trusted by:

Homeowners renovating sash windows

Builders and developers of traditional homes

Architects and conservation officers

Schools, care homes, and local councils

Landlords meeting legal safety requirements

Whether you’re ordering a single set or fitting out an entire building, we ensure consistent quality and reliable service.
Bulk orders and trade accounts
We offer trade pricing for bulk orders of Sash Restrictors, making us a trusted partner for window manufacturers, joiners, and building firms. Contact us today to set up a trade account and take advantage of:

Competitive pricing

Consistent stock availability

Fast nationwide delivery

Expert advice on product selection and installation

Bespoke sourcing for large or custom projects

Why buy Sash Restrictors from Sash Weights London?
At Sash Weights London, we combine traditional window knowledge with modern product excellence. We understand the specific challenges that come with sash window restoration and safety—and we stock only the best Sash Restrictors to meet those needs.
With us, you benefit from:

High-quality products built to last

Support from sash window specialists

A wide choice of designs and finishes

Fast, reliable shipping across the UK

Responsive customer service

Satisfaction guaranteed

Shop Sash Restrictors Online
Browse our complete range of Sash Restrictors and select the right option for your property. Whether you need fixed, concealed, or key-operated models, we have the ideal solution to protect your windows, your property, and the people who use them.
Need help choosing? Our team is just a call or email away.
Don’t compromise on safety. Invest in trusted, durable, and elegant Sash Restrictors from Sash Weights London—where traditional craftsmanship meets modern protection.