Specialist Sash Window Replacement

We carefully assess each window and only recommend replacement when necessary—ensuring your home retains its character while gaining modern performance.

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Replacing your sash windows with Heritage Sash is a structured process designed to ensure accuracy, performance, and a seamless finish.

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Step 1

Carefully assess and measure existing windows to ensure accurate replacement dimensions and correct specification.

Approx. 1-2 hour

Step 2

Remove existing sash windows and prepare the window box, checking for structural issues or hidden damage.

Approx. 1 -2 hours

Step 3

Repair or reinforce the window box where needed to create a solid foundation for the new installation.

Approx. 2-3 hours

Step 4

Install new sash windows, ensuring correct alignment, smooth operation, and secure fitting.

Approx. 1 day

Step 5

Seal, finish, and make final adjustments. Ensure smooth operation, clean the area, and leave everything ready to use.
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Approx. 4-6 hours

Why replacing your sash windows matters

In most cases, sash windows don’t need replacing—they need restoring. Our process repairs, improves, and preserves your windows at a fraction of the cost of new units.

Improve thermal efficiency.

Modern replacements significantly reduce heat loss and improve energy performance.

Eliminate ongoing repairs.

Replacement removes the need for repeated maintenance on severely damaged windows.

Enhance property value.

Well-installed sash replacements improve both appearance and long-term value.

Maintain period character.

We match original designs to preserve the look of your home.becoming major problems.

Upgrade performance.

Smooth operation, better sealing, and optional double glazing for comfort and noise reduction.

We only replace when necessary

At Heritage Sash, we always prioritise restoration. Replacement is only recommended when a window is beyond economical repair or structurally compromised. This ensures you get the right solution—not the most expensive one.

Lower Cost

Restoration and draught proofing can often achieve similar comfort improvements for a fraction of the cost of replacement windows.

Better Comfort

Reduce cold draughts, rattling and heat loss to create a warmer, quieter home throughout the year.

Preserve Original Features

Maintain the character and detailing of traditional timber sash windows while improving performance and usability.

Many sash windows are replaced unnecessarily. In many cases, careful restoration and draught proofing can extend their life for years while maintaining the original appearance of your property.

Areas We Cover

We provide sash window draught proofing, repair and restoration across London and Essex.

We regularly work in:

London

Essex

Aylesbury

Brentwood

Richmond

Chigwell

Woodford

Colchester

Chelmsford

Heritage Sash Window Replacement London Essex

We regularly travel across London, Essex and surrounding areas for sash window repair, draught proofing and restoration projects.

Sash Window Replacement FAQs

How much does sash window replacement cost?
Costs vary depending on size, specification, and materials. Replacement typically starts from £2,795 per window. We provide clear, upfront quotes after assessing your windows.
Do I need to replace all my windows?
Not always. Many properties benefit from a mix of restoration and replacement. We assess each window individually and recommend the most appropriate solution.
Will replacement change the look of my home?
No. We match the original design, proportions, and detailing to maintain the character of your property.
Will restoration improve energy efficiency?
Yes. When combined with draught proofing, replacementn can significantly reduce heat loss and improve comfort and acoustic sound.
How long does sash window replacement take?
Sash window replacement can be quick— most replacements are completed within 1-2 days, depending on the condition of the windows and the level of work required. We’ll confirm clear timings before any work begins.

Sash Window Replacement London & Essex