Ventrolla
Ventrolla is a UK heritage window and door specialist founded in 1983, restoring and manufacturing timber sash windows, casement windows, secondary glazing, and timber doors for residential property owners and commercial heritage clients across mainland England, Scotland, and Wales.
- Company typePrivate
- Founded1983
- HeadquartersHarrogate, United Kingdom
- Headcount101–250
- GTM typeB2B and B2C
- OfferingServices
What Ventrolla does
Ventrolla is a UK-based specialist in heritage timber window and door restoration, renovation, and bespoke replacement, founded in 1983 by Robert Tunnicliffe — a former Ford Motors engineer who invented the company's proprietary VPSS (Ventrolla Perimeter Sealing System) and SRS (Sash Removal System) technologies. The company operates from its Harrogate headquarters with three in-house joinery houses and regional offices across mainland England, Scotland, and Wales (excluding Northern Ireland), employing 101–250 people and having restored over 1 million windows since inception. Its core portfolio includes timber sash and casement windows, secondary glazing, vacuum glazing upgrades (partnered with FINEO), timber front and French doors, and the VR90 wood repair system, supported by a 10-year guarantee ("The Ventrolla Standard"). Adjacent offerings include Ventrolla Consult (planning advisory for listed buildings and conservation areas) and Ventrolla Plus (bespoke joinery for shutters, staircases, and architectural elements).
The business serves two primary segments: heritage property homeowners (Georgian, Victorian, Edwardian residential) and commercial owners of schools, hospitals, hotels, and heritage landmarks, with named enterprise clients including Bournville Village Trust, King Edward VI Handsworth School, St Leonard's Hospital Hackney, Temple Newsam House, Sheffield University, and Sandhurst Royal Military Academy. Go-to-market is consultative field sales: residential customers receive a complimentary in-home survey and quote, while commercial projects are managed by dedicated Commercial Project Managers with phased installation, tender support, and CAD drawings. The architect/specifier channel is built through RIBA-accredited CPD courses, NBS Plus listings, and RIBA Product Selector integration.
Revenue is generated through project-based, quote-priced work for new joinery (10–14 week lead times) and renovation services (4–8 week lead times), with commercial project management fees on enterprise contracts. Pricing is not publicly disclosed. The company is privately held with no disclosed funding rounds, no parent company, and no M&A activity; leadership is the Flanagan family (CEO Ian Flanagan, Managing Director Mark Flanagan) supported by Technical, Operations, and Regional Directors.
Ventrolla firmographics
Firmographics- Name
- Ventrolla
- Legal name
- Ventrolla Ltd
- Website
- https://ventrolla.co.uk
- Company type
- Private
- Founded year
- 1983
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Ventrolla is a UK heritage window and door specialist founded in 1983, restoring and manufacturing timber sash windows, casement windows, secondary glazing, and timber doors for residential property owners and commercial heritage clients across mainland England, Scotland, and Wales.
- Ownership category
- akta.pro rank
Ventrolla industry classification
Industry- Product category
- Heritage Window and Door Restoration Services
- NAICS
- Wood Window and Door Manufacturing (321911), Custom Architectural Woodwork and Millwork Manufacturing (337212)
- SIC
- Lumber & Wood Products (No Furniture) (2400)
- akta.pro primary industry
- Window Sash, Frame & Wood Rot Repair (HSAGABAD)
- akta.pro secondary industries
- Interior Door Replacement (Slab/Prehung) (HSAPAJAC), Stair Parts, Railings & Architectural Woodwork (HSAPAIAJ)
Keywords
Where Ventrolla is headquartered
LocationHeadquarters
- HQ city
- Harrogate
- HQ country
- United Kingdom
- HQ region
- Europe
Offices5 records
Markets served
Ventrolla business model
Business model- GTM type
- B2B and B2C
- Offering type
- Services
- Cost components
- Personnel, Supply Chain, Operations, Marketing or Sales, Technology or R&D, Infrastructure
Revenue model
- Window Restoration Services: Draught-proofing, timber repair, sash reweighing, glass replacement, and general restoration services for existing timber windows and doors. Revenue is project-based with quotes provided after complimentary survey.
- Bespoke Window and Door Manufacturing: Handcrafted timber windows (sash and casement) and doors (front and French) manufactured in company's three joinery houses. Timber options include Sapele, Accoya, redwood. 10-year guarantee on all new joinery.
- Secondary Glazing Installation: Handcrafted secondary glazing units adding extra soundproofing and heat retention. Options include standard float, toughened, or Pilkington K Glass for thermal performance.
- Commercial Project Management: Full project management for commercial heritage projects including condition reports, tender support, CAD drawings, and phased installation. Dedicated Commercial Project Managers assigned.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Pay-as-you-go | Complimentary Initial Survey |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels6 records
Ventrolla product offering
Product offeringCore offering
Ventrolla restores, renovates, and manufactures heritage timber sash windows, casement windows, and doors for period properties across the UK. The company combines traditional craftsmanship with proprietary draught-proofing and maintenance systems (VPSS and SRS) to deliver surveying, manufacturing, installation, and project management services to both residential and commercial customers. All new joinery carries a 10-year guarantee and the company operates three dedicated joinery houses in Harrogate.
Product overview
Ventrolla is a heritage window and door specialist offering a comprehensive portfolio of restoration, renovation, and bespoke replacement services. The core offering consists of timber sash windows and casement windows, complemented by secondary glazing and glazing performance upgrades (slim double glazing and vacuum glazing). The company provides proprietary systems including the VPSS (Ventrolla Perimeter Sealing System) for draught-proofing and SRS (Sash Removal System) for maintenance access, alongside the VR90 wood repair system. Door offerings include timber front doors and French doors. Supporting services include Ventrolla Consult for planning advisory, RIBA & NBS technical specifications for architects, CPD courses, and commercial project management. The Ventrolla Standard underpins all services with a 10-year guarantee.
Differentiator
Problem solved
Functional benefit
Brands
- Ventrolla Consult: Dedicated planning advisory service for listed buildings and conservation areas providing comprehensive support for window and door restoration planning permissions
- Ventrolla Plus
- The Ventrolla Standard
Quantifiable outcome
- 30% improvement in Window Energy Rating with VPSS
- +4 more outcomes
Companies that use Ventrolla
Customer profileNamed customers8 records
Segments4 records
Ideal customer profiles3 records
Ventrolla technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration4 records
Feature4 records
Ventrolla partnerships and signals
Strategic signalPartnerships
Three partnerships are on record, tiered minor and core.
- Harrogate JoineryminorProud to work alongside Harrogate Joinery as a local partner in heritage building crafts.
- RFM GroupminorProud to work alongside RFM Group as a partner in heritage building projects.
- FINEOcoreLead partner for vacuum glazing technology. FINEO provides high-performance vacuum glazing units with U-values as low as <0.7w/m2k. Ventrolla is a lead partner integrating FINEO vacuum glazing into heritage window restorations.
Scale indicators6 records
Recent moves6 records
Expansion highlights6 records
Ventrolla competitors and assessment
Company assessmentDirect peers
- The Sash Window Workshop: UK specialist in sash window restoration, replacement, and secondary glazing for period properties — the closest direct competitor to Ventrolla's residential heritage core offering.
- Mumford & Wood: Manufacturer of bespoke timber windows and doors for heritage, conservation, and high-end residential projects; competes directly with Ventrolla's joinery-manufactured sash and casement range.
- Bereco: UK manufacturer of high-performance timber windows and doors targeted at heritage, conservation, and sustainable new-build projects; closely comparable bespoke offering to Ventrolla.
- Timber Windows Ltd: UK maker of bespoke engineered timber windows and doors for period and listed properties, with Accoya-based ranges — directly comparable to Ventrolla's Accoya/redwood/Sapele joinery.
- The English Window Company: UK bespoke manufacturer of heritage timber windows and doors for Georgian, Victorian, and Edwardian properties; competes in the same product category and customer base as Ventrolla.
- WestPort Timber Windows & Doors: UK manufacturer and installer of bespoke timber windows and doors for period properties; offers comparable heritage craftsmanship and installation services to Ventrolla.
Broad incumbents
- Anglian Home Improvements: UK mass-market home improvements incumbent with a broad windows-and-doors portfolio including uPVC and timber; competes with Ventrolla in the wider home-improvement category but at a different price tier.
- Everest Ltd: Established UK home-improvements incumbent offering windows, doors, and conservatories; overlaps with Ventrolla only at the broad windows/doors category level and not on heritage craftsmanship.
- Jeld-Wen UK: Global manufacturer of windows and doors with UK operations across timber, composite, and uPVC; a broader incumbent whose timber ranges touch Ventrolla's category but at significantly larger scale.
Others
- Accsys Technologies (Accoya): Manufacturer of Accoya acetylated timber, a key raw material Ventrolla uses for high-performance sash and casement windows; an upstream supplier rather than a competitor.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Ventrolla social profiles
Digital presenceVentrolla compliance and trust
Trust signalCompliance17 records
Ventrolla financial estimates
Financial estimateRevenue estimate
Valuation estimate
Ventrolla leadership team
Management profileNumber of profiles
Profiles11 records
Ventrolla subsidiaries and ownership
Company hierarchySubsidiaries2 records
Ventrolla funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Ventrolla M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Ventrolla
What does Ventrolla do?
Ventrolla restores, renovates, and manufactures heritage timber sash windows, casement windows, and doors for period properties across the UK. The company combines traditional craftsmanship with proprietary draught-proofing and maintenance systems (VPSS and SRS) to deliver surveying, manufacturing, installation, and project management services to both residential and commercial customers. All new joinery carries a 10-year guarantee and the company operates three dedicated joinery houses in Harrogate.
Is Ventrolla a public or private company?
Ventrolla is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Ventrolla founded?
Ventrolla was founded in 1983. It employs 101 to 250 people.
Where is Ventrolla based?
Ventrolla is headquartered in Harrogate, United Kingdom, in the Europe region.
How does Ventrolla make money?
Four revenue lines are on record. Window Restoration Services are the primary driver. The others are bespoke Window and Door Manufacturing, secondary Glazing Installation and commercial Project Management.
Who are Ventrolla's main competitors?
Direct peers on record are The Sash Window Workshop, Mumford & Wood, Bereco, Timber Windows Ltd, The English Window Company and WestPort Timber Windows & Doors. Broad incumbents are Anglian Home Improvements, Everest Ltd and Jeld-Wen UK. Accsys Technologies (Accoya) is listed as an others.
Does Ventrolla have an API?
No public API is recorded for Ventrolla.
What industry is Ventrolla in?
Ventrolla's product category is Heritage Window and Door Restoration Services. Its primary akta.pro industry code is HSAGABAD, Window Sash, Frame & Wood Rot Repair, with a secondary code of HSAPAJAC, Interior Door Replacement (Slab/Prehung). Its NAICS code is 321911 and its SIC code is 2400.