KJM Group Ltd

What KJM Group Ltd does

KJM Group Ltd is a privately-held, founder-owned fenestration specialist based in Andover, Hampshire, trading since 1983 under sole owner and Managing Director Mark Pearce. The company designs, supplies and installs made-to-order windows, doors, conservatories, orangeries, extensions and roofline products, using uPVC, timber (including Accoya acetylated wood), aluminium, and composite materials, with triple-glazed units achieving U-values as low as 0.5 W/m²K and heritage systems such as Residence Collection R7 and R9. All installation work is performed by directly employed, uniformed teams, with no sub-contracting, supported by a 10-year insurance-backed warranty via Installsure.

The business serves primarily residential homeowners across Hampshire, Berkshire, Wiltshire, Surrey, Dorset, Southampton, Winchester, Basingstoke and Salisbury, and runs a separate B2B trade-counter (ProTrade Windows) plus builder partnerships in the Southampton area. Go-to-market combines in-home design consultations by non-commissioned sales staff, a physical Andover showroom, an online quote funnel, and reputation-led acquisition through Checkatrade (9.87/10, 360+ reviews), Google (4.9/5, 334+ reviews) and Which? Trusted Trader (4.9/5, Trusted Trader of the Month Feb 2024). Revenue is generated one-time at installation, structured on staged deposits and progress payments, with a small after-sales service and repair stream; pricing is quote-based and not publicly disclosed. The company carries full industry accreditations (FENSA, GGF, Trustmark, LABC Registered Partner, Buy With Confidence) and has cumulatively installed over £100M of home improvements across 25,000+ customers since 1983.

Name

KJM Group Ltd

Legal name

THE KJM GROUP LIMITED

Website

https://kjmgroup.co.uk

Company type

Private

Founded year

1983

Operating status

Operating

Headcount range

11–50 employees

Short description

KJM Group Ltd is a Hampshire-based glazing specialist, founded 1983, that designs, supplies and directly installs uPVC, timber, aluminium and composite windows, doors, conservatories and extensions for residential homeowners across southern England, backed by a 10-year insurance-backed warranty.

Ownership category

akta.pro rank

Product category

Residential Window & Door Installation

NAICS

Glass and Glazing Contractors (23815), Glass and Glazing Contractors (238150)

SIC

Prefabricated Wood Bldgs & Components (2452)

akta.pro primary industry

Prefabricated Engineered Wood Building Components (Trusses, SIPs, EWP Kits) (IMAMACAJ)

akta.pro secondary industries

Soffit, Fascia & Eaves Repair/Replacement (HSAPAKAH), Engineered Wood Siding, Trim & Mouldings (IMAMACAI)

Keywords

• Window installation services
• Door installation services
• Conservatory construction
• Double glazing services
• Home improvement glazing

Headquarters

HQ city

Andover

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, Infrastructure, Technology or R&D

Revenue model

1. Windows, Doors & Conservatories Sales & Installation: One-time sale and installation of bespoke fenestration products. Products are custom-made to customer specifications in the UK. Payment structured in stages: deposits followed by progress payments.
2. Maintenance & Repair Services: After-sales service including adjustments, repairs, and parts replacement. Dedicated service engineers handle post-installation queries and warranty claims.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels7 records

Core offering

KJM Group designs, supplies, and installs bespoke windows, doors, conservatories, orangeries, extensions, and conservatory roof replacements for residential homeowners across Hampshire and surrounding counties. Products are custom-manufactured in the UK in uPVC, timber, aluminium, and composite materials, with high-performance glazing options (including triple glazing with U-values as low as 0.5 W/m²K) and Accoya wood technology. All installations are completed by directly employed, uniformed fitters with a 10-year insurance-backed warranty, supported by an after-sales service team.

Product overview

KJM Group Ltd is a specialist home improvement company serving the Andover and Hampshire region since 1983, offering a comprehensive range of fenestration products. The core portfolio comprises uPVC, Timber, and Aluminium windows (including heritage Residence Collection R7 and R9 systems), diverse door options (bifold, French, patio, composite, timber, aluminium, and heritage steel-look), conservatories in multiple styles (Edwardian, Victorian, Gable, Lean-To, P-Shaped), and solid/tiled roof replacements. The company provides specialist offerings including triple glazing (achieving U-values as low as 0.5 W/m²K), secondary glazing for heritage properties, integral blinds, and comprehensive glass options (Low-E, acoustic, solar control, self-cleaning). All products are installed by directly employed teams, supported by a 10-year insurance-backed guarantee, and backed by accreditations including FENSA, GGF membership, and Which? Trusted Trader status.

Differentiator

Problem solved

Functional benefit

Products and services

• Windows (uPVC, Timber, Aluminium, Composite) Custom-manufactured windows in uPVC (A-rated casement and tilt & turn), timber (hand-finished hardwood and Accoya with Teknos water-based paint), aluminium (slimline for modern homes), and composite materials. Installed by directly employed fitters for residential customers in Hampshire and South England.
• Residence 9 (R9) Heritage Windows Premium heritage timber-alternative windows using a 100mm nine-chamber system, accommodating 28mm double or 44mm triple glazing and achieving U-values as low as 0.8 W/m²K (triple) or 1.2 W/m²K (double). Designed for period properties, conservation areas, and heritage renovations.
• Residence 7 (R7) Flush Casement Windows Flush casement windows in a 75mm deep system designed as a timber alternative for heritage properties, replicating traditional aesthetics with modern thermal performance.
• Triple Glazed Windows High-performance 44mm triple glazed units featuring two Low-E coatings, Argon gas fill in both cavities, and warm edge spacer bars, achieving U-values as low as 0.5 W/m²K — over 40% better than A-rated double glazing.
• Secondary Glazing Secondary window system designed for heritage buildings, conservation areas, and sound insulation, achieving U-values of 1.8 W/m²K or better.
• Doors (Composite, Aluminium, Timber, uPVC, Steel-Look, Bifold, French, Patio) Bespoke door range including high-security composite doors (Solidor, Comp Door brands with 10-year warranty), aluminium front doors, timber front doors, uPVC entrance doors, Crittall-style steel-look heritage doors, slimline aluminium bifold doors (Smarts Visoglide), traditional French doors, sliding patio doors, and Garador garage doors.
• Garador Garage Doors Garador garage doors supplied and installed for residential garage applications, backed by a 5-year warranty.
• Conservatories (Bespoke, Timber, Edwardian, Victorian, Gable, Lean-To, P-Shaped) Bespoke conservatories in timber, Edwardian, Victorian, Gable, Lean-To (Mediterranean), and P-Shaped styles, custom-designed and installed for residential customers.
• Orangeries Premium orangery extensions combining solid roof sections with full-height glazing for residential customers seeking a higher-specification alternative to a standard conservatory.
• Extensions and Conservatory Conversions Full home extension services and conservatory-to-room conversions transforming existing conservatories into usable year-round living spaces.
• hup! Pre-fabricated Extensions Modern pre-fabricated hup! extension system supplied and installed by KJM Group, offering a faster-build alternative to traditional extensions.
• Porches Bespoke entrance porches designed, supplied, and installed for residential properties to add covered entry space and kerb appeal.
• Conservatory Roof Replacements (Glass, Tiled, Solid) Conservatory roof replacement service offering glass, tiled, and solid roof options, plus roof lanterns and flat skylights, to upgrade thermal performance and usability of existing conservatories.
• Maintenance, Repair, and After-Sales Service After-sales service provided by dedicated service engineers covering adjustments, repairs, parts replacement, and warranty claims for previously installed windows, doors, and conservatories, with 10-year insurance-backed warranty administered through Installsure.
• ProTrade Windows (Trade Division Supply) Supply-only fenestration products (windows and doors) sold to local builders, contractors, and trade installers through the ProTrade Windows division at protradewindows.co.uk.
• Fire Stop Certified Fire Doors Fire-rated Fire Stop certified fire doors added to KJM's door range, addressing fire safety and building regulations compliance for residential customers.
• Premium Hardware for Profile 22 Doors (Ultion Sweet & Fab&Fix) Premium hardware specification for Profile 22 composite doors featuring Ultion Sweet locking and Fab&Fix handles, introduced in 2026 as a security and aesthetics upgrade to the door range.

Quantifiable outcome

• Over 40% better thermal insulation with triple glazing vs A-rated double glazing (U-values 0.5 W/m²K vs 1.0 W/m²K)
• +2 more outcomes

Named customers9 records

Segments1 record

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eleven partnerships are on record, tiered minor and core.

• Raising Twenty1minorOthers · 1 January 2026Local charity receiving £6,000+ from 2026 Andover Soapbox Derby. Charity supports children with Down's syndrome and their families across Hampshire.
• Andover Soapbox DerbyminorGTM or Marketing Partner · 1 January 2026Headline sponsor of 2026 Andover Soapbox Derby, covering essential running costs to keep the event free for 3,500-4,000 spectators.
• LABC (Local Authority Building Control)coreStrategic or Co-development Partner · 1 January 2025LABC Registered Partner for building control compliance. Ensures installations meet required building standards and regulations.
• InstallsurecoreStrategic or Co-development Partner · 1 January 2023Insurance-backed warranty provider. In the event KJM ceases trading, Installsure covers legitimate warranty claims for up to 10 years.
• Glass & Glazing Federation (GGF)coreStrategic or Co-development Partner · 1 January 1983Full registered member of GGF, adhering to their Code of Practice. GGF is the primary trade body for the glass and glazing industry, providing standards, guidance, and consumer protection.
• FENSAcoreStrategic or Co-development Partner · 1 January 1983Registered member of FENSA (Fenestration Self-Assessment Scheme) - the Competent Person Scheme for self-certification under Building Regulations. Handles compliance documentation for installations.
• TrustmarkcoreStrategic or Co-development Partner · 1 January 1983Trustmark approved installer - government-endorsed quality scheme ensuring consumers find reliable, trustworthy tradespeople for home improvements.
• Which? Trusted TradercoreChannel Partner/ Reseller/ Distributor · 1 January 1983Which? Trusted Trader endorsed, providing consumer protection and dispute resolution through Ombudsman Services Ltd. Holds near-perfect 4.9/5 rating.
• CheckatradecoreChannel Partner/ Reseller/ Distributor · 1 January 1983Checkatrade approved with 9.87/10 rating based on 360+ reviews. High reliability (9.92) and tidiness (9.90) scores.
• Hampshire County Council Buy With ConfidencecoreChannel Partner/ Reseller/ Distributor · 1 January 1983Member of Hampshire County Council's Buy With Confidence scheme - a trading standards approved directory of reliable local businesses.
• Local Builders (Southampton)minorChannel Partner/ Reseller/ Distributor · 1 January 1983Partnerships with local builders in the Southampton area to tackle extensions and new-build projects alongside KJM's fenestration products.

Scale indicators8 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Safestyle UK: One of the UK's largest volume PVC-U window and door installers, listed on AIM. While far larger and national in reach, it competes with KJM on price and service for mainstream double-glazing replacement work in the same homeowner segment.
• Everest Home Improvements: Long-established national UK home improvements brand in windows, doors and conservatories. Comparable offering to KJM with similar heritage/trust positioning but at national scale with employed installer model.
• Anglian Home Improvements: National UK home improvements company offering windows, doors, conservatories and living spaces. Directly comparable product set to KJM but operates at vastly larger scale with heavy TV-led marketing.

Direct peers

• Zenith Staybrite: UK regional window, door and conservatory installer with directly employed fitters and showroom-based sales. Operates with similar in-home consultative selling model to KJM in overlapping geographic territories.
• Clearview Home Improvements: UK home improvements installer offering windows, doors, conservatories and orangeries with directly employed fitters. Closely comparable product portfolio and operating model to KJM in the residential replacement market.

Regional players

• CR Smith: Scotland-based windows, doors and conservatory manufacturer-installer with directly employed teams and showrooms. Comparable vertically integrated install model to KJM but in a different regional market.

Others

• Ultraframe: Leading UK manufacturer of conservatory and extension roof systems. KJM is an Ultraframe installation partner and won their Installation of the Month (May 2026). Adjacent ecosystem participant, not a direct competitor.
• Residence Collection: Manufacturer of the R7 and R9 heritage timber-alternative window systems that KJM installs. Supplier/technology partner rather than a competitor, but defines the premium heritage window category KJM competes in.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/KJMGroupLtd
• Facebookfacebook.com/KJMWindowsDoorsConservatories

Compliance12 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 KJM Group Ltd