SASH WINDOW HERITAGE LIMITED

What SASH WINDOW HERITAGE LIMITED does

Sash Window Heritage Limited is a UK-based specialist joinery contractor that restores and upgrades traditional timber sash and casement windows in period properties. The firm is differentiated by its ability to retrofit 10-12mm slim-profile double-glazed units and Fineo vacuum glazing into existing Victorian and Georgian sash frames without frame replacement, thereby retaining architectural authenticity while delivering U-values as low as 1.2 and claimed 75%+ heat-loss reductions versus single glazing. Complementary services include draught proofing, sash-cord and weight replacement, Window Care resin repairs for rotten timber, new box-sash window manufacturing, casement window installation, and bespoke doors.

Founded in 2007 by Malcolm Mew (Managing Director) and Graham May (Director), the company operates two offices (Tunbridge Wells HQ and Brighton) and serves residential customers across London and the South East of England. Revenue is generated on a quote-based, free-site-survey model with no fixed public pricing and no e-commerce channel; sales run via direct phone contact and website lead forms, with conversion through in-house surveyors, specialist joiners, and painters. All select-customers referenced in the dataset are SMB/private homeowners, with concentration in Tunbridge Wells, Sussex, Surrey, and South London. The company is privately held, founder-led, with no disclosed external funding, no parent entity, and approximately five named full-time team members supplemented by craftsmen across restoration, fitting, and painting disciplines.

Name

SASH WINDOW HERITAGE LIMITED

Legal name

Sash Window Heritage Limited

Website

https://sashwindowheritage.co.uk

Company type

Private

Founded year

2007

Operating status

Operating

Headcount range

1–10 employees

Short description

Sash Window Heritage Limited is a UK specialist joinery contractor restoring and retrofitting double glazing into traditional timber sash and casement windows for residential period-property owners across London and the South East.

Ownership category

akta.pro rank

Product category

Window Restoration Services

NAICS

Wood Window and Door Manufacturing (321911)

SIC

Services-Miscellaneous Repair Services (7600), Millwood, Veneer, Plywood, & Structural Wood Members (2430)

akta.pro primary industry

Window & Door Frame/Sash Replacement (HSAPAJAF)

akta.pro secondary industries

Window Sash, Frame & Wood Rot Repair (HSAGABAD), Window/Door Frame Repair & Rot Remediation (Wood/Composite) (HSAGAEAI), Window Replacement (Residential) (HSAPAJAA)

Keywords

• Sash window restoration
• Timber window repair
• Double glazing retrofit
• Heritage window services
• Period property joinery

Headquarters

HQ city

Tunbridge Wells

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales

Revenue model

1. Sash Window Restoration Services: Core service restoring sash windows to original condition with focus on mechanical and aesthetic aspects. Includes draught proofing, sash cord replacement, and weight rebalancing.
2. Double Glazing Retrofit Installation: Installation of 10-12mm slim-profile double glazed units into existing timber sash frames. Majority of customers opt for this system. Includes environmental benefit of approximately 90kg CO2 savings per square metre replaced per year.
3. New Window Manufacturing and Installation: Complete service including removal of existing windows, manufacturing of new windows in their workshops (single or double-glazed), installation, and full draught sealing. Internal architraves and window boards can be fitted.
4. Painting Services: Specialist painting team offers internal and external painting services for windows and doors. Available as add-on to all main service offerings.
5. Bespoke Doors: Supply and installation of single, double, French, bi-fold or tri-fold doors, single or double-glazed. Includes draught sealing and fitting of internal architraves.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Sash Window Heritage restores and upgrades traditional timber sash and casement windows for period properties. The company specialises in retrofitting slim-profile 10-12mm double glazed units into existing timber frames, repairing rotten timbers using the Window Care resin system, draughtproofing, and manufacturing new box sash windows, casement windows, and bespoke doors. Services are delivered via free site surveys followed by bespoke quotes to homeowners in London and the South East of England.

Product overview

Sash Window Heritage Limited operates as a specialist timber window restoration company offering a unified portfolio of services focused on preserving and upgrading traditional sash windows. The core offering combines sash window restoration with modern double glazing solutions, centred around two main glazing products: Slender Fit (thin 10-12mm double-glazed units) and Fineo (advanced vacuum glazing technology). Additional services include draughtproofing and overhauling, rotten frame repairs using Window Care resin system, and new window/door manufacturing (box sash windows, casement windows, and bespoke doors). The company serves period properties in London and the South East, with offices in Tunbridge Wells and Brighton.

Differentiator

Problem solved

Functional benefit

Products and services

• Sash Window Restoration Comprehensive restoration service for traditional timber sash windows, including repair of rotten frames, sash cord replacement, weight rebalancing, and draught sealing to return windows to original working condition. Designed for homeowners with Victorian or Georgian period properties.
• Slender Fit Double Glazed Units Thin 10-12mm double-glazed units designed for installation in traditional wooden sash windows. Can achieve U-values as low as 1.2 and reduce heat loss by over 75% compared to single glazing. Available in configurations with a 4mm clear outer pane and cavities of 4mm, 6mm or 8mm.
• Fineo Vacuum Glazing Advanced vacuum insulating glazing technology that is 8 times more efficient than single glazing and 12.5% more efficient than 36mm triple glazed units, with 34% noise reduction compared to single glazing. Features a slim profile with no evacuation port and very thin edge seals ensuring maximum vision area.
• Double Glazed Sash Windows (Retrofit Installation) Retrofit service that fits 10-12mm thick double glazed units (with inert gas such as xenon or krypton and low emissivity inner pane) into existing timber sash frames, retaining the original window appearance while delivering the benefits of modern double glazing.
• Draughtproofing and Overhauling Service Service to eliminate draughts, reduce noise, stop rattling, improve insulation and security, reduce dirt ingress, and ensure smooth running windows for sash windows, casement windows, and doors.
• New Box Sash Windows Complete new window manufacturing service for sash windows including removal of existing windows, workshop manufacturing of new sash windows and frames, installation with draught sealing, and optional painting service.
• Casement Windows Supply and installation of new casement windows, available in single or double-glazed configurations, with full draught sealing and painting services.
• Bespoke Doors Custom door manufacturing including Single, Double, French, Bi-fold, and Tri-fold configurations. Available single or double-glazed, with installation, draught sealing, internal architraves, and painting services.
• Sashes and Casements Fitting Service Fitting new sashes or casements into existing frames, allowing retention of the original box frame and architraves while providing the look of new windows at reduced cost.
• Rotten Frame Repair Service Specialist repair service using the Window Care resin system to cut out rotten timbers and splice in new wood, resolving rot problems permanently rather than as a short-term fix.
• Painting Services Specialist painting team offering internal and external painting services for windows and doors, available as an add-on to all main service offerings.

Quantifiable outcome

• 75%+ reduction in heat loss compared to single glazing (Slender Fit)
• +5 more outcomes

Named customers11 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators3 records

Recent moves4 records

Expansion highlights4 records

Broad incumbents

• George Barnsdale & Sons: Heritage-grade British timber window and door manufacturer with strong presence in listed/conservation projects. Larger and more industrial than Sash Window Heritage but competes for the same high-end period-property segment.
• Timber Windows Oxford: Established UK manufacturer and installer of timber windows, doors and conservatories. Broader product portfolio than Sash Window Heritage but overlapping in heritage timber casements and sash windows for period properties.
• Mumford & Wood: UK manufacturer of premium timber windows, doors and conservation-grade glazing for heritage buildings. Comparable conservation-area expertise, larger scale and broader distribution.
• Anglian Home Improvements: National UK home improvement company offering windows, doors and conservatories including some timber ranges. Not a heritage specialist, but a large incumbent whose marketing scale affects category-level customer acquisition.

Direct peers

• London Sash Window Repairs: London-focused sash window repair, restoration and replacement specialist. Comparable service menu, customer profile and field-based consultative sales model.
• Cheyne Sash Windows: London and South East specialist in sash window restoration, replacement and double glazing. Similar focus on period properties and heritage-compliant upgrades.
• Ventrolla: National UK specialist in sash window renovation, draught-proofing and slim double-glazing retrofit. Closely comparable offering, geographic reach is broader but the same core trade and customer profile (period property homeowners).
• The Sash Window Workshop: Specialist timber sash window manufacturer and installer serving the South East of England with new sashes, casements and double-glazing options. Direct overlap with Sash Window Heritage's restoration and new-manufacturing services.

Regional players

• Cherwell Sash Windows: Oxfordshire-based sash window specialist serving central-southern England. Comparable craft model and product mix but different primary geography from Sash Window Heritage's London/SE focus.

Others

• Fineo Glass: Manufacturer of the Fineo vacuum insulating glazing units that Sash Window Heritage specifies. An upstream supplier rather than a competitor, but directly comparable technologically and a key partner for any installer entering the heritage slim-glazing segment.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/sashwindowheritage
• LinkedInlinkedin.com/company/sash-window-heritage-limited

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SASH WINDOW HERITAGE LIMITED