Product Guide
Published: September 2026
By: DKL Metals Technical Team

Traditional Quality for Modern and Heritage Projects

DKL Metals supplies high-quality lead sash window weights for restorations and new installations, available in various sizes and custom-cut to requirements.

Lead’s high density allows more weight to fit into smaller sash boxes, making it ideal for older windows with limited space or for upgrading to heavier double glazing.

About Sash Window Weights

Acting as counterweights via pulleys, these components ensure smooth, quiet operation in traditional windows.

Benefits of Lead Sash Weights

Superior Balance

Keeps the sash operating smoothly at the desired height.

Space Efficiency

Denser than cast iron for smaller box sections.

Durability

Resists corrosion for long-lasting performance.

Customisable

Easily cut to length on-site.

Why Choose DKL Metals?

Cast from high-purity lead to meet ISO environmental standards, with custom-cut options available upon request.

What are sash window weights made from? +

Traditional sash weights were made from cast iron or lead due to their density. At DKL Metals, we focus on high-quality lead weights for superior balance and smooth operation, ideal for both single and double-glazed sashes.

How do I choose the right size of sash weight? +

The correct size depends on your sash’s total weight and frame height. As a general rule, each sash weight should be approximately half the total sash mass. Always measure your window box space before ordering to ensure compatibility.

Can lead sash weights be adjusted or cut? +

Yes, one of the main benefits of lead weights is that they can easily be cut to the required length to achieve the exact balance your window needs.

Are lead sash window weights suitable for listed buildings? +

Absolutely. Lead sash weights maintain the traditional counterbalance design that preserves the authenticity of period windows and heritage restorations while delivering smooth, reliable operation.

Do sash window weights improve energy efficiency? +

Properly balanced sash windows help maintain a tight seal when closed, reducing draughts and heat loss. This makes them more energy-efficient and comfortable year-round.

Can you get custom sized sash window weights? +

Yes. DKL Metals provides cut-to-size lead sash weights on request. Simply contact us with your sash measurements, and our team will help you find the correct fit.

How long do lead sash weights last? +

Lead sash weights are incredibly durable and can last for several decades without corrosion or degradation, especially when installed properly within traditional timber sash boxes.

Get in Touch

Contact DKL Metals for bespoke sizing and traditional window supplies.

Contact Us!