About Ada Windows

Ada Windows Ltd is a FENSA-registered manufacturer and installer of energy-efficient UPVC and aluminium double glazing windows and doors, based in Enfield, North London. The company operates its own production factory in Enfield, where it fabricates windows and doors in-house before installation by its own trained teams. Ada Windows serves residential and commercial clients across Greater London, Hertfordshire, Essex, Kent, and Surrey.

Legal name	Ada Windows Limited
Trading name	Ada Windows Ltd / Ada Windows
Registered country	England & Wales
Founded	2015 (factory established); management experience in the industry since 2001
Headquarters	Enfield, North London
Factory	Production factory in Enfield, North London — manufactures UPVC and aluminium windows and doors in-house
Service area	Greater London, Hertfordshire, Essex, Kent, Surrey — up to 50-mile radius (larger projects considered up to 100 miles)
Telephone	020 8803 8004
Website	adawindows.com
FENSA number	36583
Trustmark number	1461244
Guarantee	10-year insurance-backed guarantee (IBG) on all installations
Accreditations	FENSA · Trustmark · HomePro · Fairtrades · BFRC · CE Marking
Finance	Available subject to status (introducer for Ideal4Finance, FRN 703401)

Ada Windows Ltd manufactures and installs UPVC and aluminium windows and doors from its own factory in Enfield, North London. The company was established as a fabrication centre in 2015 by a management team with experience in the double glazing industry stretching back to 2001. Since beginning manufacture, Ada Windows has completed over 4,000 window and door installation projects, currently installing up to 2,400 windows per year across London and the Home Counties.

Ada Windows holds six industry accreditations: FENSA registration (number 36583), Trustmark endorsement (number 1461244), HomePro consumer protection, Fairtrades accreditation, BFRC energy ratings, and CE Marking. All installations come with a 10-year insurance-backed guarantee covering both labour and workmanship.

The company serves both residential homeowners and commercial clients, including trade supply, shopfront glazing, and large-scale replacement projects. Ada Windows covers Greater London, Hertfordshire, Essex, Kent, and Surrey within a 50-mile radius of Enfield, with larger commercial projects considered up to 100 miles.

Ada Windows is one of a small number of double glazing companies in North London that fabricates its own products rather than sourcing from a third-party manufacturer. The Enfield factory produces UPVC window frames, aluminium window frames, and door units to order, allowing Ada Windows to control quality from raw profile to finished installation.

Products available from the Ada Windows factory include:

• UPVC windows — casement, tilt and turn, flush sash, sliding sash, and bay styles
• Aluminium windows — slim sightline frames in a full RAL colour range
• UPVC and aluminium bifold doors
• UPVC and aluminium sliding patio doors
• UPVC front and back doors
• Aluminium entrance and commercial doors
• Composite front doors
• Secondary glazing panels

 

Window frames are available in a range of colours and finishes including classic white, anthracite grey, black, rosewood, mahogany, and golden oak. Custom RAL colours are available on aluminium profiles.

All glazed units are manufactured to BFRC energy-rating standards. Double, triple, and acoustic glazing options are available, as well as specialist glass types including obscure, safety, and decorative glass

Ada Windows Ltd holds the following industry accreditations and consumer protection registrations:

FENSA — registration number 36583

FENSA (the Fenestration Self-Assessment scheme) is a government-authorised competent-person scheme for the installation of replacement windows and doors in England and Wales. FENSA registration means Ada Windows self-certifies that all installations comply with UK Building Regulations (in particular Part L, energy efficiency). Every Ada Windows installation is registered with FENSA and the homeowner receives a FENSA certificate, which is required when selling a property.

Trustmark — registration number 1461244

Trustmark is a government-endorsed quality scheme administered by the Department for Energy Security and Net Zero. Trustmark-registered businesses have been vetted for technical competence, customer service standards, and fair trading practices. Trustmark registration is a condition of accessing certain government energy-efficiency grant schemes.

HomePro

HomePro is a consumer protection scheme that provides deposit protection and insurance-backed guarantees for home improvement work. HomePro registration gives Ada Windows customers additional protection on deposits paid and on the guarantee, independent of the installer.

Fairtrades

Fairtrades accreditation recognises businesses that adhere to ethical trading standards and transparent customer practices.

BFRC — British Fenestration Rating Council

BFRC energy ratings are the industry-standard measure of window energy efficiency in the UK. Ada Windows products carry BFRC energy ratings, allowing customers to compare energy performance. A-rated windows are the most energy efficient and can reduce household heat loss significantly compared to single glazing or older double-glazed units.

CE Marking

CE Marking certifies that Ada Windows products conform to the relevant EU and UK product safety, health, and environmental requirements.

Ada Windows operates a materials recycling scheme as part of its commitment to reducing landfill waste from the double glazing industry. Waste generated during both manufacturing and installation is segregated and recycled rather than sent to landfill. Materials recycled by Ada Windows include:

• UPVC window and door frame offcuts from the Enfield factory
• Aluminium profile offcuts and off-cuts from installation
• Insulated glazing units (IGUs) removed during replacement work
• Packaging materials from product delivery

 

Recycled UPVC material is used in the manufacture of new window frames, reducing the volume of virgin PVC required. Ada Windows window frames are manufactured with recyclability in mind — UPVC profiles can be recycled multiple times without significant degradation in material quality.

The company also uses energy-efficient manufacturing processes at its Enfield factory, and all installed windows meet or exceed BFRC energy efficiency standards, contributing to reduced household carbon emissions across the properties it serves.

Ada Windows serves clients within a 50-mile radius of its Enfield factory for standard residential and commercial projects. The primary service area is North London, extending to the surrounding counties. Larger commercial projects are considered up to a 100-mile radius subject to project scope.

North London boroughs

London Borough of Enfield (headquarters)
Enfield Town, Edmonton, Lower Edmonton, Upper Edmonton, Edmonton Green, Palmers Green, Southgate, Arnos Grove, Oakwood, Cockfosters, Winchmore Hill, Bush Hill Park, Grange Park, Gordon Hill, Enfield Chase, Enfield Highway, Enfield Lock, Enfield Wash, Ponders End, Brimsdown, Freezywater, Forty Hill, Bulls Cross, Bullsmoor, Clay Hill, Hadley Wood, Crews Hill, Botany Bay, World’s End, Turkey Street, Meridian Water

London Borough of Haringey
Wood Green, Tottenham, South Tottenham, Tottenham Hale, Seven Sisters, Turnpike Lane, Hornsey, Crouch End, Stroud Green, Finsbury Park, Muswell Hill, Alexandra Palace, Highgate, Noel Park, Bruce Grove, West Green, White Hart Lane, Bounds Green, New Southgate, Fortis Green, Harringay, Green Lanes, Manor House, St Ann’s

London Borough of Barnet
Barnet, New Barnet, East Barnet, High Barnet, Chipping Barnet, Finchley, North Finchley, East Finchley, West Finchley, Finchley Central, Golders Green, Hendon, Brent Cross, Cricklewood, Edgware, Mill Hill, Burnt Oak, Colindale, Grahame Park, Whetstone, Totteridge, Friern Barnet, Oakleigh Park, New Southgate, Brunswick Park, Arkley, Hadley Wood, Potters Bar (border area), Barnet Gate, Ducks Island

London Borough of Islington
Islington, Upper Street, Angel, Highbury, Holloway, Archway, Tufnell Park, Finsbury Park (border), Canonbury, Barnsbury, Caledonian Road, Nag’s Head, Drayton Park, Stroud Green (border), Tollington, Hillmarton, Liverpool Road, Essex Road

London Borough of Hackney
Hackney, Stoke Newington, Dalston, Clapton, Lower Clapton, Upper Clapton, Stamford Hill, Shacklewell, Kingsland, Hoxton, Haggerston, De Beauvoir Town, Homerton, Hackney Wick, London Fields, Broadway Market, Bethnal Green (border), Shoreditch (border)

London Borough of Waltham Forest
Walthamstow, Chingford, Chingford Hatch, Chingford Green, North Chingford, South Chingford, Highams Park, Higham Hill, Leyton, Leytonstone, Walthamstow Village, Hoe Street, Wood Street, Blackhorse Road, Markhouse, Cann Hall, Snaresbrook (border)

London Borough of Camden
Camden Town, Kentish Town, Hampstead, Belsize Park, Primrose Hill, Highgate, Dartmouth Park, Gospel Oak, Tufnell Park, Holloway (border), Chalk Farm, Swiss Cottage, South Hampstead, West Hampstead, Fortune Green, Kilburn (border), Somers Town, Kings Cross, Bloomsbury, Fitzrovia (northern part), Regent’s Park

 

North London boroughs

London Borough of Brent
Wembley, Wembley Park, Wembley Central, North Wembley, South Wembley, Sudbury, Sudbury Hill, Harlesden, Kensal Green, Kensal Rise, Willesden, Willesden Green, Neasden, Tokyngton, Stonebridge, Church End, Brondesbury, Brondesbury Park, Kilburn, Queens Park (border), Cricklewood (border), Fryent

London Borough of Harrow
Harrow, Harrow on the Hill, Harrow Weald, Wealdstone, Headstone, Kenton, North Harrow, South Harrow, Rayners Lane, Hatch End, Pinner, Pinner Green, Eastcote, Stanmore, Canons Park, Queensbury, Edgware (border), Belmont, Roxbourne, Roxeth

London Borough of Ealing
Ealing, West Ealing, North Ealing, South Ealing, Acton, East Acton, West Acton, South Acton, North Acton, Hanwell, Greenford, Perivale, Northolt, Southall, Norwood Green, Dormers Wells, Pitshanger, Castlebar, Hanger Hill, Lammas Park

London Borough of Hillingdon
Uxbridge, Hayes, Harlington, West Drayton, Yiewsley, Heathrow (Airport area), Ruislip, Ruislip Manor, South Ruislip, North Ruislip, Eastcote (border), Northwood, Northwood Hills, Ickenham, Cowley, Colham Green, Cranford, Sipson, Harmondsworth, Longford, Viewsley, Botwell, Wood End

London Borough of Hounslow
Hounslow, Hounslow East, Hounslow West, Hounslow Central, Chiswick, Brentford, Isleworth, Feltham, Hanworth, Bedfont, Hatton, Heston, Lampton, Cranford, Osterley, Spring Grove, Whitton, Twickenham (border), Staines Road area

London Borough of Hammersmith and Fulham
Hammersmith, Fulham, Shepherd’s Bush, White City, Parsons Green, Munster Village, Sands End, Walham Green, Barons Court, Ravenscourt Park, Brook Green, Wormholt, College Park, North End

Royal Borough of Kensington and Chelsea
Kensington, North Kensington, South Kensington, Chelsea, Notting Hill, Portobello, Ladbroke Grove, Holland Park, Earl’s Court, West Brompton, World’s End (Chelsea), Brompton, Knightsbridge (border)

 

East London boroughs

London Borough of Newham
Stratford, West Ham, East Ham, Forest Gate, Manor Park, Plaistow, Canning Town, Custom House, Beckton, Upton Park, Green Street, Little Ilford, Maryland, Silvertown, North Woolwich, Royal Docks

London Borough of Redbridge
Ilford, South Ilford, Gants Hill, Newbury Park, Barkingside, Clayhall, Fairlop, Hainault, Cranbrook, Aldborough Hatch, Seven Kings, Goodmayes, Chadwell Heath (border), Snaresbrook, Wanstead, South Woodford

London Borough of Barking and Dagenham
Barking, Dagenham, Becontree, Chadwell Heath, Rush Green, Marks Gate, Parsloes, Valence, Thames View, Creekmouth, Eastbury, Gascoigne

London Borough of Havering
Romford, Harold Wood, Harold Hill, Collier Row, Gidea Park, Emerson Park, Hornchurch, Upminster, Cranham, North Ockendon, Rainham, Elm Park, South Hornchurch

London Borough of Tower Hamlets
Bethnal Green, Stepney, Poplar, Limehouse, Mile End, Bow, Bromley-by-Bow, Whitechapel, Spitalfields, Wapping, Isle of Dogs, Canary Wharf, Cubitt Town, Millwall, Shadwell, Ratcliff

 

Central London

City of Westminster
Westminster, Paddington, Maida Vale, Little Venice, St John’s Wood, Marylebone, Mayfair, Soho, Covent Garden, Pimlico, Victoria, Bayswater, Hyde Park area, Regent’s Park area

 

South London boroughs

Home Counties

Hertfordshire
Waltham Cross, Cheshunt, Broxbourne, Hoddesdon, Ware, Hertford, Hertford Heath, Bayford, Welwyn Garden City, Welwyn, Hatfield, St Albans, Borehamwood, Radlett, Shenley, Potters Bar, Cuffley, Goffs Oak, Northaw, Brookmans Park, Essendon, Crews Hill (border), Wormley, Turnford, Nazeing, Roydon, Harlow, Epping, North Weald, Theydon Bois, Ongar, Sawbridgeworth, Bishop’s Stortford (subject to project size)

Essex
Epping, Chigwell, Loughton, Buckhurst Hill, Theydon Bois, Waltham Abbey, Nazeing, Roydon, Harlow, Stapleford Abbotts, Abridge, Romford (border), Brentwood, Shenfield, Ingatestone, Chelmsford (subject to project size), Grays, Tilbury (subject to project size)

Kent
Dartford, Swanley, Sevenoaks, Orpington (border), Longfield, Gravesend (subject to project size)

Surrey
Staines-upon-Thames, Egham, Guildford (subject to project size), Woking (subject to project size), Weybridge, Esher, Cobham, Leatherhead (subject to project size), Reigate (subject to project size)

Ada Windows has been installing windows and doors in North London since 2015. Key figures:

• Over 4,000 window and door installation projects completed since 2015
• Up to 2,400 windows installed per year at current capacity
• 25 years of management experience in the double glazing industry (since 2001)
• 10-year insurance-backed guarantee provided on every installation
• FENSA registration number 36583 — all installations registered and certificated
• Verified reviews on Checkatrade, Trustpilot, and Yell

Ada Windows is registered on Checkatrade, Trustpilot, and Yell. The company has received verified reviews covering UPVC window installation, composite door fitting, secondary glazing, aluminium bifold doors, and full property double glazing replacement projects.

Telephone: 020 8803 8004

Website: adawindows.com

Quote requests: adawindows.com/contact

Factory and registered office: Enfield, North London

Ada Windows offers free, no-obligation quotations. A fenestration surveyor will visit the property to assess requirements and provide a written quotation. Finance options are available subject to status.