What L&L Installations does

L&L Installations Limited is a Tewkesbury, Gloucestershire-based, family-run manufacturer and installer of double glazing founded in 1981 by John and David Lannen. The company designs, fabricates, and installs uPVC, aluminium, and timber windows, doors, conservatories, secondary glazing, and replacement roof systems for residential and commercial customers across five counties (Gloucestershire, Worcestershire, Herefordshire, Oxfordshire, and Wiltshire). Its core-manufactured offering is the proprietary OPTiMAL uPVC range, produced at its own Kennet Close factory; the company also serves as a retail/installation partner for premium third-party brands including Spitfire Doors, SunflexUK, ALUCO, VELFAC, Rationel, Evolution Windows, and LEKA Systems.

The business is fully vertically integrated: every installation is carried out by L&L's own employed and trained teams, with no subcontracting. Revenue is generated primarily through one-time, made-to-measure project sales with bespoke pricing set via in-home consultation and showroom quotation, plus a service and maintenance stream covering remedial work and a 10-year insurance-backed guarantee (underwritten by QA National Warranties) that includes free annual inspections. Distribution is direct, via a Tewkesbury showroom (by appointment) and home-visit sales consultants, supported by FENSA registration (since 2002), Which? Trusted Trader endorsement, and reputation-led marketing across Facebook, YouTube, LinkedIn, and X.

The customer base is predominantly residential homeowners undertaking window/door replacement or conservatory builds, supplemented by a smaller but visible book of architects, property developers, and commercial/hospitality projects (e.g., West Mercian Property, Ye Olde Black Bear, Calmsden Estate, Cripps & Co, the LATITUDE bespoke house). Headcount is "over 30" spanning sales, surveying, manufacturing, installation, service, administration, and customer care. The company is privately held under founder/family ownership with no disclosed external investment, acquisitions, or restructuring events.

Name

L&L Installations

Legal name

L&L Installations Limited

Website

https://ll-installations.co.uk

Company type

Private

Founded year

1981

Operating status

Operating

Headcount range

11–50 employees

Short description

L&L Installations is a family-run, Tewkesbury-based manufacturer and installer of uPVC, aluminium, and timber windows, doors, conservatories, and roof systems for residential homeowners and selected commercial clients across five South-West English counties, with its own OPTiMAL range and employed installation teams.

Ownership category

akta.pro rank

Product category

Windows and Doors Manufacturing and Installation

NAICS

Wood Window and Door Manufacturing (321911), Glass and Glazing Contractors (23815)

SIC

Lumber & Wood Products (No Furniture) (2400)

akta.pro primary industry

Windows (IMADAIAC)

akta.pro secondary industries

Interior Glazing & Glass Partitions (IMAFANAK), Egress Window Installation/Replacement (HSAPAJAH), Joinery, Millwork & Casework Installation (Cabinetry, Built-Ins) (IMAFANAJ)

Keywords

• Double glazing windows
• UPVC windows and doors
• Aluminium glazing systems
• Conservatory installations
• Timber window manufacturing

Headquarters

HQ city

Tewkesbury

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Windows, Doors & Conservatories Sales: One-time sale of manufactured and installed uPVC, aluminium and timber windows, doors, conservatories and related products. Products are made-to-measure and bespoke. The company does not require deposits on in-house uPVC products.
2. Installation Services: Professional installation of all products by L&L's own employed and trained installation teams. Full installation service included with products.
3. Service & Maintenance: Repair facilities on uPVC and aluminium products, remedial work through a highly experienced service team, annual inspection service for 10 years

Go-to-market motion2 records

Distribution channels4 records

Marketing channels7 records

Core offering

L&L Installations manufactures, supplies, and installs made-to-measure double-glazing windows, doors, and conservatories in uPVC, aluminium, and timber for residential and commercial customers across South West England. The company operates its own in-house OPTiMAL uPVC manufacturing range alongside complementary partner-brand products, delivering the full project from design and survey through installation to a 10-year insurance-backed guarantee.

Product overview

L&L Installations is a family-run double glazing company established in 1981, offering a comprehensive portfolio of bespoke windows, doors, conservatories, and related products for residential and commercial customers in Gloucestershire and surrounding counties. Their core offering includes three primary window materials (uPVC, aluminium, and timber) and door systems, all available in multiple styles. Their flagship in-house brand is OPTiMAL, a handcrafted uPVC windows and doors range manufactured exclusively in their Tewkesbury factory. Beyond their manufactured products, they serve as retail partners for premium brands including Spitfire Doors, SunflexUK, ALUCO Steel Look, Rationel, and VELFAC. Additional products include conservatories (Gable-fronted, P/T/L-Shaped, Georgian, Lean-to, Victorian, and Orangeries), secondary glazing solutions, and replacement roof systems (LEKA Warm Roof, Livinroof, polycarbonate, and glass). The company provides a complete service encompassing design, manufacture, installation, and a 10-year insurance-backed guarantee with free annual maintenance inspections.

Differentiator

Problem solved

Functional benefit

Brands

• OPTiMAL: The exclusive in-house brand of uPVC windows, doors, conservatories and garden rooms manufactured by L+L Installations. The name derives from sourcing the very best parts to create a unique product built to its 'Optimum' standard.

Products and services

• OPTiMAL Windows and Doors (proprietary in-house uPVC range) Made-to-measure uPVC windows and doors manufactured in-house under the OPTiMAL brand, supplied and installed with a 10-year insurance-backed guarantee and free annual maintenance checks for the first five years; targeted at residential homeowners across the South West England catchment.
• Aluminium Windows and Doors

Quantifiable outcome

• U-values as low as 0.15 W/m2k with LEKA Warm Roof System
• +3 more outcomes

Named customers6 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

Five partnerships are on record, tiered core and minor.

• ALUCOcoreTechnology or IntegrationALUCO Aluminium Steel Look Retail Partner. L&L supplies and installs ALUCO's Steel Look aluminium doors and windows, including Heritage 47 French doors. Featured in multiple projects including Old Gore barn conversion and Calmsden Workspace.
• VELFACcoreTechnology or IntegrationL&L supplies VELFAC composite windows featuring timber core with aluminium outer facing. Products include Ribo, RiboPlus, Classic, and ClassicPlus models. Used in projects like Rous Lench.
• Spitfire DoorscoreGTM or Marketing PartnerSpitfire Doors Design Partner. L&L is an approved installer offering Spitfire's S-100, S-200, S-500 and custom-designed entrance doors. Featured in LATITUDE project with S-500 Signature Entrance door.
• SunflexUKcoreChannel Partner/ Reseller/ DistributorSunflexUK Retail Partner and specialist installer of bi-fold doors, sliding doors, and windows. L&L has been a distributor since 2000. Featured extensively in projects including Longmead (SVG30 sliders), Black Bear (SF55 bifold), and Rous Lench.
• QA National WarrantiesminorOthersInsurance provider for L&L's 10-year guarantee backing. Ensures guarantee validity even if company cannot fulfil obligations.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Anglian Home Improvements: UK's largest home improvements company selling and installing windows, doors, conservatories, and double glazing nationally. Direct competitor to L&L in the same product category but at vastly greater scale and geographic reach; L&L differentiates on bespoke service and premium positioning.
• IDSystems: UK specialist in aluminium bifolding and sliding doors plus glass roof lanterns, serving architects and premium residential customers. Comparable product range to L&L's Sunflex/ALUCO offerings and shared customer base of design-led residential and commercial projects.
• Quickslide Windows & Doors: UK-based fabricator and installer of uPVC and aluminium windows and doors, similar in size and regional approach to L&L. Directly comparable in business model (manufacture + install) and product mix, serving trade and retail customers across similar UK regions.
• Zenith Staybrite Windows: UK regional window and door installer and manufacturer with comparable product range (uPVC, aluminium, timber) and similar sized operation. Direct peer competing in similar geographies and customer segments.
• Clearview Bi-folding Doors: UK specialist manufacturer and installer of premium aluminium bi-folding and sliding doors. Comparable to L&L's premium Sunflex/ALUCO offerings and serves similar architects, developers, and high-end residential customers seeking bespoke glazing solutions.
• Sternfenster: UK trade fabricator of uPVC and aluminium windows and doors with own-brand OPTIONAL range. Comparable manufacturer profile to L&L's OPTiMAL offering, serving trade and installer networks rather than retail directly.
• Everest Home Improvements: Major UK national installer of double glazing, windows, and doors with a similar product range to L&L (uPVC, aluminium, timber). Direct competitor with strong brand recognition and similar premium positioning, but operates across the entire UK.
• Safestyle UK: UK's largest focused replacement window and door installer, primarily serving the volume market. Comparable product offering (uPVC windows and doors) but competes on price rather than bespoke quality, serving as the lower-tier alternative to L&L's premium positioning.

Broad incumbents

• Crittall Windows: Heritage British steel window manufacturer with established brand and national reach. Comparable to L&L's ALUCO Steel Look heritage offering but at significantly larger scale and broader product portfolio; serves both heritage restoration and contemporary architectural markets.
• Schüco UK: Global German manufacturer of premium aluminium window, door, and façade systems. Comparable to the premium aluminium products L&L sources (ALUCO, SunflexUK) but as a much larger systems house serving commercial and high-end residential projects across the UK.

Market position

Strengths1 record

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/LLinstallations
• YouTubeyoutube.com/@LLInstallationsLtdTewkesbury
• Facebookfacebook.com/LLInstallations
• LinkedInlinkedin.com/company/l&l-installations

Compliance2 records

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 L&L Installations