Renlon Limited

What Renlon Limited does

Renlon Limited is a UK specialist contractor providing structural waterproofing, damp proofing, and timber treatment services to residential and commercial buildings, with a primary operational focus on London and the South East of England. Incorporated as a private limited company in England and Wales (company number 01272413) and operating from Mitcham, Surrey, the firm traces its operating history back over 40 years and reports more than 25,000 completed installations. Its service portfolio covers basement waterproofing using Type A (barrier), Type B (structurally integral), and Type C (cavity drain) systems in line with BS 8102:2009, timber infestation treatments for wet and dry rot, rising damp remediation, ground gas proofing systems compliant with BS 8485:2015+A1:2019, and specialist waterproofing for listed heritage buildings. The company maintains a sub-brand, RenStrength, for its proprietary Type A waterproofing system and holds certified installer status with Delta Membrane Systems (MS 20 and MS 500 cavity drain membranes) and MemTech (Liquid Gas Barrier), with Sika waterproofing products also used across its project base.

The business operates a project-based professional services model, generating revenue through tendered contracts covering survey, design, and installation phases, with quotations valid for three months, multi-year contract cadences, and pricing structured on a quote-by-project basis including variation rates and minimum visit charges. Customer segments split between end homeowners (residential basement conversions, swimming pools, home cinemas) and commercial clients (hotels, museums, university buildings, multi-level commercial basements), with notable reference projects including the Ashmolean Museum for Oxford University, the Kensington Forum Hotel redevelopment by Ardmore (a £1.2M basement waterproofing contract across 10,000+ m²), and works on listed heritage assets such as the Royal Bell Bromley and a Victorian Grade II listed building in Clerkenwell. The go-to-market depends primarily on professional referrals and repeat specification from main contractors (Wates, HG Construction, Trac Construction, O'Sullivan Civil Engineering) and architects/surveyors (HUT Architecture, Moreno Masey), supplemented by direct enquiries through the company website and telephone.

The firm positions itself on certified expertise — every surveyor holds CSSW and CSRT credentials, supporting BS-standards compliance and a 10-year guarantee on design and remedial solutions — together with heritage-grade specialisation that has secured high-profile references including the Houses of Parliament. Operations are wholly domestic; the corporate structure sits under a holding entity (Renlon Holdings Limited), with Renlon Limited as the operating subsidiary. There are no external funding rounds, M&A activity, or AI/technology platform signals in the available data, and the business model remains that of a traditional, skilled-trades specialist contractor.

Name

Renlon Limited

Legal name

Renlon Limited

Website

https://renlon.co.uk

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

11–50 employees

Short description

Renlon Limited is a UK specialist contractor delivering structural waterproofing, damp proofing, timber treatment, and ground gas protection services for residential, commercial, and listed heritage buildings, primarily across London and South East England, using certified Type A, B, and C systems.

Ownership category

akta.pro rank

Product category

Structural Waterproofing Services

NAICS

Architectural, Engineering, and Related Services (5413)

SIC

Adhesives & Sealants (2891)

akta.pro primary industry

Concrete Waterproofing & Moisture Mitigation (HSAGALAF)

akta.pro secondary industries

Waterproof Coatings & Leak Sealing (Basements, Foundations, Roof Coatings) (HSAGADAI), Concrete Repair, Sealing & Waterproofing (Coatings/Membranes) (IMAIAKAK), Priming, Sealing & Waterproof Coatings (Stain/Smoke Sealing, Damp-Proofing) (HSAPAHAH)

Keywords

• Structural waterproofing services
• Basement waterproofing
• Damp proofing solutions
• Timber infestation treatment
• Ground gas remediation

Headquarters

HQ city

Mitcham

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Marketing or Sales, Others

Revenue model

1. Waterproofing Project Services: Renlon generates revenue through specialist waterproofing project contracts. Projects range from residential basement waterproofing to large commercial developments. Revenue is project-based with contracts tendered for specific works including survey, design, and installation phases.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Renlon Limited provides specialist structural waterproofing, damp proofing, timber infestation treatment, and ground gas proofing services for residential and commercial buildings. The company delivers survey, design, and guaranteed installation using Type A (barrier), Type B (structurally integral), and Type C (cavity drain) waterproofing systems, with branded offerings including the RenStrength Type A waterproofing system and certified installation of Delta, MemTech, and Sika products. Services are backed by CSSW and CSRT certified surveyors and a 10-year guarantee on all design and remedial solutions.

Product overview

Renlon Limited is a specialist contractor offering integrated structural waterproofing and building preservation services rather than a software product company. The service portfolio centers on basement waterproofing (utilizing Type A cementitious systems, Type B waterproof concrete, and Type C cavity drain membrane approaches), timber infestation treatment, and rising damp remediation. Key branded offerings include the RenStrength Type A waterproofing system, gas proofing systems using MemTech LGB technology, and cavity drain systems using Delta membranes. The company also specializes in heritage building preservation, with documented projects including the Houses of Parliament and Oxford's Ashmolean Museum. Services are delivered by CSSW and CSRT certified surveyors with a 10-year guarantee on completed works.

Differentiator

Problem solved

Functional benefit

Brands

• RenStrength: A Renlon Brand - Type A waterproofing system

Products and services

• Basement Waterproofing Services Full guarantee-backed systems for internal and external waterproofing of below-ground structures and elevated decks, using Type A, Type B, and Type C waterproofing approaches in accordance with BS 8102:2009. Targeted at residential and commercial property owners, contractors, developers, surveyors, and architects.
• Timber Infestation Treatment Treatment services to rectify and prevent dry and wet rot decay to structural timber and joinery using non-flammable timber preservatives. Targeted at residential homeowners, heritage property custodians, and commercial building owners.
• Rising Damp Treatment A range of render and membrane systems and damp proof courses to rectify and prevent damp penetration, including chemical damp proof course injection and salt-resistant rendering. Targeted at residential and commercial property owners with damp issues in walls.
• Listed Heritage & Historic Buildings Waterproofing Specialist design and installation of waterproofing systems and remedial solutions for listed heritage and historic buildings, using materials considerate to the building fabric with a 10-year guarantee. Targeted at owners, custodians, and estates teams of listed heritage buildings.
• RenStrength Type A Waterproofing System A Renlon-branded Type A waterproofing system used for external deck waterproofing and internal soffit applications, featuring active water-stopping plugging compounds, reactive waterproof slurry, pre-bagged render, and carbon fibre strengthening mesh. Targeted at waterproofing projects with complex detailing requirements.
• Gas Proofing Systems Ground gas protection systems using MemTech LGB (Liquid Gas Barrier), compliant with BS 8485:2015+A1:2019 and BR211/CIRIA guidelines, suitable for NHBC GREEN, AMBER 1, and AMBER 2 site characterisations. Targeted at commercial and residential property developers on sites with ground gas contamination risk.
• Cavity Drain Membrane Installation Type C cavity drain system installation using Delta MS 20 (floor) and Delta MS 500 (walls) BBA-certified cavity drain membranes, incorporating perimeter channels and sump pump chambers for managed water ingress. Targeted at below-ground structures requiring Type C waterproofing.

Named customers16 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Five partnerships are on record, tiered core and minor.

• Delta Membrane SystemscoreTechnology or IntegrationRenlon is a certified installer of Delta Membrane Systems products including Delta MS 20 cavity drain membrane (for floors) and Delta MS 500 cavity drain membrane (for walls). The partnership involves certified installation services and access to BBA-certified waterproofing products.
• MemTechcoreTechnology or IntegrationRenlon is a registered installer of MemTech products including MemTech Pro Liquid Gas Barrier (LGB) - a styrene butadiene latex based liquid applied gas membrane providing protection against methane, carbon dioxide, radon, and ground gases. Products comply with BS 8485:2015+A1:2019.
• Sika WaterproofingcoreTechnology or IntegrationRenlon uses Sika waterproofing products including Sika-1 prebagged mortar, Sika-1 Spritz Mortar, Sika-1 Render and Finishing Mortar, Sika-1 Screed Mortar, and epoxy cementitious combination materials for damp proof membranes.
• Trac ConstructionminorChannel Partner/ Reseller/ DistributorTrac Construction referred Renlon for the Corbridge Crescent commercial blocks project in Hackney, acting as a referring contractor partner.
• Architects & Surveyors NetworkcoreChannel Partner/ Reseller/ DistributorRenlon works in partnership with architects and surveyors providing specialist waterproofing design advice and survey services. Surveyors refer clients for specialist waterproofing, rising damp, and timber treatment expertise.

Scale indicators9 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Delta Membrane Systems: UK manufacturer and supplier of cavity drain membranes (including the MS 20 and MS 500 used by Renlon). Operates a broader national network of certified installers and is both a Renlon partner and a competitive installer in the same waterproofing space.
• Sika UK: UK arm of a global construction chemicals manufacturer whose waterproofing mortars and renders Renlon uses. Competes indirectly via its own waterproofing product portfolio and approved contractor network, while also being a Renlon supplier.
• Rentokil Property Care (Rentokil Initial): UK property care division of a large pest control and hygiene group offering damp proofing, timber treatment, and waterproofing. A scaled incumbent competing with Renlon for residential remedial work.

Direct peers

• Safeguard Europe: UK manufacturer and installer of damp-proofing and structural waterproofing systems. Overlaps with Renlon's rising damp, waterproofing, and remedial treatment offerings for residential and commercial buildings.
• Peter Cox: UK specialist contractor for property care including damp proofing, timber treatment, and structural waterproofing. Overlaps with Renlon's residential remedial services and rising damp/timber infestation offerings.
• Triton Systems: UK provider of basement waterproofing and damp proofing systems with both products and installation services. Directly comparable to Renlon on Type C cavity drain and Type A barrier waterproofing.
• Newton Waterproofing Systems: UK-based specialist in structural waterproofing and basement conversions. Directly comparable to Renlon in offering Type A/B/C waterproofing systems to contractors, developers, and homeowners across the UK.
• Wykamol Group: UK specialist in structural waterproofing, damp proofing, and timber treatment products and installation. Serves the same contractor, developer, and homeowner segments as Renlon.
• Timberwise: UK specialist contractor delivering timber preservation, damp proofing, and basement waterproofing services. Comparable to Renlon on rising damp, timber treatments, and residential waterproofing.

Emerging players

• Koster Waterproofing Systems: European manufacturer of waterproofing systems including the cementitious slurries Renlon uses. Acts as a niche/specialised competitor in the same cementitious and surface waterproofing category, with growing UK presence.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/renlongroup
• LinkedInlinkedin.com/company/renlongroup

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

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 Renlon Limited