Timeless Wood & Sash Windows of Dublin

What Timeless Wood & Sash Windows of Dublin does

Timeless Wood & Sash Windows of Dublin (legal entity P & G Callaghan, trading as Timeless Sash Windows) is a family-owned bespoke timber window and door manufacturer founded in 1973 and headquartered at a workshop and showroom in Trim, Co. Meath, Ireland. The company specializes in handcrafted heritage and conservation joinery, producing sash windows, casement windows, timber doors, interior shutters, and secondary glazing systems tailored for period properties, protected structures, and landmark buildings. Technical capabilities include a proprietary Slim-Glaze System for slim-profile double glazing, Fineo vacuum glazing integration (U-value ~0.7 W/m²K, 20-year warranty), Class 4 independently tested draught proofing, Accoya splice repairs with a 50-year anti-rot guarantee, and a Teknos four-coat paint system. The company serves Ireland and the greater London area, with a documented project portfolio spanning castles (Ashford Castle, Killeen Castle), government and cultural landmarks (National Gallery, Cathal Brugha Barracks), and residential heritage refurbishments.

The business operates on a project-based, bespoke manufacturing model. Revenue is generated through one-time sales of custom-manufactured windows and doors, professional services for window refurbishment and restoration, and secondary glazing installations for protected structures. Pricing is non-standardized: every job begins with a free, no-obligation site survey followed by a bespoke quote that varies by window type, timber choice (Accoya, Utile, Iroko, Sapele), glazing specification, ironmongery, and project scope. The go-to-market combines direct sales through the showroom and field engagement with architects, builders, surveyors, and homeowners, supplemented by CPD presentations to RIAI and IHBC architects, tradeshow presence (RDS House, National Ploughing Championships), earned media (RTE Room to Improve feature, January 2025), and referral networks. With 11-50 employees and over 2,000 cumulative customers, the company operates a small specialist team focused on high-value, technically complex heritage projects rather than volume production.

The company's competitive positioning is anchored in regulatory expertise for protected structures, decades-long craft specialization, and post-2022 recovery resilience. A devastating fire on April 19, 2022 destroyed the original Trim facility; the company responded by establishing temporary operations in Kilcock within a month and retaining nearly all 147 active projects. A rebuilt sustainable production facility reopened on September 5, 2025, operating on 100% green electricity with 113 kW solar panels and a biomass burner, signaling both operational continuity and forward-looking investment in lean manufacturing capacity.

Name

Timeless Wood & Sash Windows of Dublin

Legal name

P & G Callaghan

Website

https://timelesssashwindows.ie

Company type

Private

Founded year

1973

Operating status

Operating

Headcount range

11–50 employees

Short description

Timeless Sash Windows is a family-owned Irish bespoke timber window and door manufacturer, founded 1973, specializing in heritage sash window restoration, conservation joinery, and slim-profile glazing for protected structures across Ireland and greater London.

Ownership category

akta.pro rank

Product category

Custom Timber Window and Door Manufacturing

NAICS

Wood Window and Door Manufacturing (321911)

SIC

Millwood, Veneer, Plywood, & Structural Wood Members (2430)

akta.pro primary industry

Custom Window & Door Fabrication & Replacement (HSAPAJAI)

akta.pro secondary industries

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

Keywords

• Bespoke timber windows
• Sash window restoration
• Heritage window manufacturing
• Conservation joinery
• Timber door fabrication

Headquarters

HQ city

Dublin

HQ country

Ireland

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Infrastructure, Technology or R&D

Revenue model

1. Bespoke Timber Windows and Doors: Manufacture and installation of bespoke timber sash windows, casement windows, and timber doors. All products are handcrafted to order in their Meath workshop. Revenue is generated through project-based contracts including survey, manufacture, and fitting.
2. Window Refurbishment Services: Refurbishment and restoration of existing timber windows including sash repair, frame refurbishment, splice repairs, re-painting, and re-glazing with draught proofing. Provides full-service solution from sash removal to on-site reinstallation.
3. Secondary Glazing: Supply and installation of secondary glazing (timber sash, timber casement, and steel casement types) fitted inside existing window frames, particularly for protected structures.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

Timeless Wood & Sash Windows of Dublin manufactures and installs bespoke handcrafted timber windows (sash and casement) and timber doors from its workshop in Trim, Co. Meath, Ireland. The company specialises in heritage window restoration and refurbishment for protected structures, period properties, and large-scale conservation projects across Ireland and the greater London area, complemented by secondary glazing, draught proofing, and proprietary slim-glaze and vacuum glazing upgrades.

Product overview

Timeless Sash Windows is a bespoke timber window and door manufacturer offering a comprehensive portfolio of handcrafted products and services. The core offerings include sash windows, casement windows, wood doors, and interior shutters, all manufactured from timber. The company specializes in both new bespoke manufacturing and the refurbishment/restoration of historic timber windows. Their product range includes specialized glazing solutions such as their proprietary Slim-Glaze System (slimline double glazing with krypton fill) and Fineo vacuum glazing. Secondary glazing systems are offered as an add-on for improved thermal and acoustic performance. Services encompass window refurbishment, restoration for heritage/protected structures, and complete bespoke window packages including draught proofing, custom ironmongery, and professional painting. All products are handcrafted to order at their Meath workshop and tailored to specific architectural requirements.

Differentiator

Problem solved

Functional benefit

Brands

• Timeless Slim-Glaze System: Proprietary slimline double glazing system for timber sash windows

Quantifiable outcome

• Fineo vacuum glazing achieves U-value of approximately 0.7 W/m2K — thermal performance comparable to triple glazing in a single-glazed appearance
• +7 more outcomes

Named customers14 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Seven partnerships are on record, tiered notable and core.

• EnerglazenotableStrategic or Co-development Partner · 26 January 2025Energlaze donated Fineo vacuum glazing to the Tranquility House (RTE Room to Improve) project. Fineo is a vacuum glazing technology providing ultra-thin profiles with high thermal performance (U-value ~0.7 W/m2K) and a 20-year warranty.
• Fineo (AGC Glass)coreTechnology or IntegrationFineo vacuum glazing is a core technology used in Timeless Sash Windows' heritage window refurbishments. Fineo glass provides U-values of approximately 0.7 W/m2K, reducing noise levels by 34% compared to single glazing. Fineo is manufactured by AGC Glass and is presented as a key differentiator for heritage window upgrades.
• AccoyacoreTechnology or IntegrationAccoya acetylated softwood is used for splice repairs on historic timber windows. FSC-approved with a 50-year anti-rot guarantee. Accoya is described as making an excellent match for original slow-grown pitch pine commonly used in historic windows.
• Dermot Bannon ArchitectsnotableImplementation/ SI/ Consulting PartnerDermot Bannon was the principal architect on the Tranquility House RTE Room to Improve project. Timeless Sash Windows worked closely with the architectural team throughout the window restoration process.
• Coco Content (RTE)notableGTM or Marketing PartnerCoco Content produced the RTE Room to Improve television segment featuring Timeless Sash Windows' work on Tranquility House, providing significant media exposure.
• TeknoscoreTechnology or IntegrationTeknos water-based specialist exterior joinery paint is used in a four-coat painting system. Teknos paint lasts approximately 7 years before repointing is required, contributing to the durability of Timeless window finishes.
• Pat WigglesworthnotableImplementation/ SI/ Consulting PartnerPat Wigglesworth was the conservation contractor for the 3 Henrietta Street restoration. Timeless Sash Windows were contracted by Pat Wigglesworth to restore 53 windows throughout the property, which won the IGS Conservation Award 2019.

Scale indicators8 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Ventrolla: UK-based specialist in sash window restoration, draught proofing, and replacement for period and heritage properties. Highly comparable as a direct heritage sash-window competitor targeting similar conservation-conscious customers across the British Isles.
• Mumford & Wood: UK-based manufacturer of high-performance timber windows and doors for heritage, conservation, and luxury residential projects. Comparable on premium bespoke timber windows, conservation-grade specifications, and architect/specifier-led sales.
• The Sash Window Workshop: UK manufacturer and installer of bespoke timber sash and casement windows for period homes. Directly comparable on bespoke heritage manufacturing, slim-profile double glazing, draught proofing, and refurbishment services.
• Bere: Architecture (Bere Timber Windows): UK maker of high-end bespoke timber windows and doors for listed and period properties. Closely comparable on heritage joinery, slim-glazing, draught proofing, and conservation-officer-led specification.
• Kloeber: UK supplier of bespoke timber windows and doors, including flush casement and heritage profiles. Comparable on architect-led, high-end bespoke timber product range and custom fabrication for period properties.

Broad incumbents

• Rationel (VKR Holding/DO Vinduer): Danish manufacturer of energy-efficient timber and timber/aluminium windows and doors for residential and light commercial projects. Broader incumbent in the European premium timber window category.
• NorDan: Large Scandinavian manufacturer of high-performance timber and timber/aluminium windows serving residential and commercial markets across Europe. A broader incumbent in premium timber fenestration, not heritage-specialized but indicative of scale and performance benchmarks.
• Internorm: Large European manufacturer of timber, timber/aluminium, and uPVC windows and doors. A broad incumbent rather than a heritage specialist, but operates in adjacent premium residential fenestration across Europe.

Emerging players

• Mitchell & Dickinson: Irish/UK company focused on vacuum glazing solutions for heritage and energy-efficient retrofits, including the Energlaze product. Comparable on heritage retrofit use cases and partnership with Fineo-style vacuum glazing technologies referenced by Timeless Sash Windows.

Others

• Accoya (Accsys Technologies): Manufacturer of Accoya acetylated timber used by Timeless Sash Windows for splice repairs and joinery. Not a competitor but a critical upstream supplier and technology partner for the company's 50-year anti-rot guarantee.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCsWv9BQap1rQxB_LHzFJeow
• Facebookfacebook.com/timeless-sash-windows-1851017058487979
• LinkedInlinkedin.com/company/timeless-sash-windows
• Instagraminstagram.com/timelesssashwindows
• Xx.com/timelesssashwin

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 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 Timeless Wood & Sash Windows of Dublin