| # |
| 1st Drainclear Ltd | 104 Edgehill Road, Edgebury | | | |
| A |
| A G Plumbers | Ponders End, no street on record | | | |
| A10 boiler sparesnot edited since 2014 | Bowes, no street on record | | | |
| AA Plumbing and Bathrooms | 190 Shooters Hill Road, Kidbrooke | | | |
| Advanced Plumbing & Heating Services | Upminster Road South, Rainham | | | |
| Angel Plumbing Servicesnot edited since 2012 | 177 Goswell Road, Clerkenwell | | | |
| Ashtanot edited since 2018 | 36 Chamberlayne Road, Kensal Town | | | |
| B |
| Bansal | 313-319 High Road Leytonstone, Maryland | | | |
| Boilers R Us | 121 Station Road, Lamorbey | | | |
| Brooks JJ | Brixton, no street on record | | | |
| C |
| Capital Plumbing & Heating Materialsnot edited since 2020 | Becontree Heath, no street on record | | | |
| Carshalton Boiler Servicesnot edited since 2018 | 63 Carshalton Road, Sutton | | | |
| Central Plumbing Heating | 47 Crawford Street, Marylebone | | | |
| Central Pumping Supplies | 62 Central Road, Worcester Park | | | |
| Chartered Institute of Plumbing and Heating Engineering | 64 Station Lane, Hornchurch | ciphe.org.uk | | |
| City Spark | 94 Hamlets Way, Mile End | | | |
| Combi Plumbing | Bromley-by-Bow, no street on record | | | |
| D |
| Drain Smart | Eden Park, no street on record | drain-smart.co.uk | | |
| E |
| Eastwood Suppliesnot edited since 2021 | Plaistow, no street on record | | | |
| Elite Plumbing & Bathroomsnot edited since 2020 | 61-65 Myddleton Road, Bowes Park | elite-plumbing-bathrooms.business.site | | |
| Embassy Plumbing Supplies | 101-105 Frampton Street, Paddington | embassyplumbing.com | | |
| En-Suites & Bathrooms | 287 Munster Road, Fulham | en-suite.co.uk | | |
| EPS | Enfield, no street on record | eps.london | | |
| Euro Plumbingnot edited since 2018 | Rayners Lane, no street on record | | | |
| Excel Plumbing & Heating Supplies | Stroud Green, no street on record | hanleyestates.com | | |
| F |
| Flo-Well Drainage and Plumbingnot edited since 2019 | Unit 8 Ness Road, Slade Green | flo-well.co.uk | | |
| FW Hipkin | Chadwell Heath, no street on record | | | |
| G |
| GB Heating and Plumbing Servicesnot edited since 2017 | Pinner, no street on record | | | |
| GBM Heating | 182 Stanley Road, Hampton Hill | gbmheating.com | | |
| GOGO Boiler | 344 Footscray Road, New Eltham | boilersrus-uk.co.uk | | |
| GS Plumbing & Heating Merchants Ltdnot edited since 2016 | 85 Wood Street, Upper Walthamstow | | | |
| H |
| HGnot edited since 2019 | Lambeth, no street on record | | | |
| I |
| Interheatnot edited since 2018 | 12 The Parade, Carshalton | heating-southlondon.co.uk | | |
| J |
| J R Bilke | 59 Shirley Road, Longlands | | | |
| K |
| Kelvin Plumbing Supplies | Crofton, no street on record | | | |
| L |
| Lavender Heating & Plumbingnot edited since 2016 | Clapham, no street on record | | | |
| Little Details Property Services Ltd | 586 Kingston Road, Raynes Park | littledetailshomerenovation.com | | |
| London & Surrey Bathrooms | 147-149 Stafford Road, South Beddington | | | |
| M |
| Modern Plumbing and Heating | Greenford, no street on record | | | |
| N |
| North West Heating & Plumbing LTD | 2 Cumberland Court, Wealdstone | | | |
| Northolt Plumbing, Heating & Bathroom Centrenot edited since 2013 | Northolt, no street on record | | | |
| NPH | 13 Abbotsbury Road, Morden | | | |
| P |
| Plumbase | 1-3 North Road, Holloway | plumbase.co.uk | | |
| Plumbath | 11 Golders Green Road, Brent Cross | | | |
| Plumbing Heating Gas | 24 Croft Avenue, West Wickham | | | |
| Plumbwell | Addington, no street on record | | | |
| Professional Plumbing Solutionnot edited since 2018 | 282 Court Road, Mottingham | | | |
| R |
| R G Taylor Engineering Ltdnot edited since 2018 | Hainault, no street on record | | | |
| RWW Plumbing & Heating Limitednot edited since 2018 | 11 Gordon Road, Carshalton-on-the-Hill | | | |
| S |
| Sargeant & Son Ltd. | 278B Kingshill Avenue, Hayes End | sargeantandson.co.uk | | |