UK Manufactured Lead Sash Weights — Cast to Any Size Since 1770
Heaps, Arnold & Heaps Ltd is one of the UK’s longest-established manufacturers of lead sash weights, supplying joiners, timber window manufacturers and heritage restoration contractors across the country direct from our Rotherham facility. With over 250 years of manufacturing experience, we manufacture lead sash weights to any size, shape or specification — from single replacement weights for restoration work to bulk trade orders of several thousand units per month.
Every weight is manufactured in the UK from refined lead, drilled for sash cord, and quality-checked before dispatch. Custom labelling, bespoke profiles and scheduled production runs are all available as standard for trade customers.
Why Choose Heaps, Arnold & Heaps Lead Sash Weights?
- UK manufactured at our Rotherham facility — no imports, no middlemen
- Any size or shape — round, square, rectangular, bespoke profiles
- Consistent weight tolerance across batches for production-line consistency
- Custom labelling available for trade customers managing complex window jobs
- Bulk trade pricing
- Fast UK-wide delivery via established logistics partners
- Over 250 years of casting expertise — established 1770
- Conservation-appropriate for Listed building and heritage restoration
Lead Sash Weight Profiles — Round, Square & Rectangular
We manufacture lead sash weights in every common profile. Each shape has specific use cases, and we manufacture all three to any reasonable size and weight specification.
Round Lead Sash Weights
Round lead sash weights are a common profile in traditional UK sash window construction and have been the standard since the 18th century. The cylindrical profile drops cleanly through narrow weight pockets, runs smoothly without snagging on pulley cords, and provides the historically authentic look that conservation officers consistently approve for Listed building work.
If you’re restoring a Georgian or Victorian sash window, round lead weights are almost always the correct historical choice. Typical specifications:
- Diameters from 25mm to 76mm
- Lengths from 200mm up to 1200mm
- Weights from approximately 1kg to over 50kg per weight
- 12mm central fixing hole drilled for sash cord
Square Lead Sash Weights
Square lead sash weights are typically chosen when the sash pocket is narrow and a flat-sided weight is needed to maximise the available drop. Common applications include older timber sash windows where box frame cavities are narrow but tall, and Listed building conservation work where the original profile was square.
Typical specifications:
- Cross-sections from 25mm × 25mm up to 63mm × 63mm
- Lengths typically 200mm to 1200mm
- Weight ranges from approximately 1kg to over 50kg per weight
- Drilled for sash cord at the top as standard
- Custom-stamped labelling available for trade orders
Rectangular Lead Sash Weights
Rectangular lead sash weights are ideal for larger sash windows and heavier glazing applications where round or square profiles can’t deliver enough mass within the available pocket space. They’ve become increasingly common with modern timber sash windows incorporating double-glazed units, which can weigh significantly more than traditional single-pane sashes.
Many window manufacturers find that standard round weights simply can’t deliver the mass required to balance heavier double-glazed sashes within standard pocket dimensions. Rectangular weights solve this by maximising the cross-sectional area of lead within the pocket. Typical specifications:
- Cross-sections from 40mm × 30mm up to 80mm × 20mm (or custom)
- Lengths typically 300mm to 1200mm
- Weights from 2kg to over 50kg per weight
- Drilled centrally for sash cord at the top
- Optional countersunk drillings for specific cord types
Standard Sizes — 600mm & 1200mm Lead Sash Weights
Two lengths come up repeatedly in UK joinery: 600mm lead sash weights and 1200mm lead sash weights. These have become de facto standards for many window manufacturers because they match common sash heights in modern timber window production.
600mm Lead Sash Weights
A 600mm weight typically suits sash heights in the 1100mm–1400mm range with single-pane glazing, or shorter sashes with heavier double-glazed units. Depending on profile (round, square or rectangular) and diameter, a 600mm lead sash weight will typically deliver between 3kg and 7kg of counterbalance per weight.
1200mm Lead Sash Weights
A 1200mm weight is used for taller sash windows — typically 1800mm+ sash heights — and for full-height Georgian and Victorian-style restoration work. Depending on profile and cross-section, a 1200mm lead sash weight will typically deliver between 6kg and 14kg of counterbalance.
Both lengths are available in round, square or rectangular profiles, cast to your target weight specification. For non-standard lengths — anything from 200mm short replacements up to 1500mm for very large architectural sashes — request a custom quote.
Bulk Lead Sash Weight Supplier — Trade Volume & Credit Accounts
Heaps, Arnold & Heaps is a leading UK bulk lead sash weight supplier serving timber window manufacturers, joinery workshops and architectural ironmongers nationwide. Volume customers benefit from trade pricing tiers, credit terms and dedicated production scheduling.
Trade Customer Benefits
- Volume trade pricing with discounts on orders over 100, 500 and 1000 units
- Credit accounts with BACS payment terms for established trade customers
- Custom labelling at no extra cost — stamp your customer reference, window ID, or any project tracking system directly onto each weight
- Scheduled production to support your build pipeline rather than holding stock
- Repeat order arrangements with standing quotes for ongoing supply
- Direct delivery to your workshop or directly to job sites
- UK-based account management — fast response, no offshore call centres
How Trade Ordering Works
- Submit a quote request with your typical sizes, profiles, weights and monthly volume estimate
- We respond within 1 working day with volume tier pricing and lead times
- For ongoing supply we set up a credit account with agreed BACS terms
- Orders can then be placed by phone, email, or via repeating purchase orders
- Weights are cast, labelled to your specification, and dispatched on agreed terms
Custom Specifications & Bespoke Labelling
For trade customers managing complex installation schedules across multiple job sites, our custom labelling service saves significant time during installation. We can stamp or scribe each weight with:
- Your customer reference (e.g. property address abbreviation)
- Window identifier from your paperwork (e.g. “L1”, “L2”, “K3”)
- Weight value in kg for fitter confirmation
- Your company part number or product code
- Any combination of the above
This service is available at no extra charge for trade orders. Many of our regular customers consider it essential — having clearly identified weights in the van means installers can grab the right pair instantly without having to weigh or compare anything on site.
Who Buys Our Lead Sash Weights?
Our lead sash weights are used by professionals across the UK timber window and joinery sector:
- Timber sash window manufacturers (volume production)
- Heritage restoration contractors working on Listed buildings
- Architectural ironmongers and trade merchants
- Bespoke joinery workshops
- Property developers and conservation specialists
- Carpenters and self-builders sourcing replacement weights
- NHS estates teams maintaining heritage hospital buildings
- Local authority conservation departments
Quality, Consistency & Conservation Compliance
All weights are manufactured from refined lead at our Rotherham facility to ensure consistent density and accurate target weights. We’ve been manufacturing lead products since 1770 — every weight that leaves our facility meets the specification it was ordered to.
For heritage and Listed building work, our weights are documented as UK manufactured for conservation compliance. We can supply documentation of origin and material composition where required by conservation officers or planning departments.
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