| AJ100 2018 Ranking | Practice | |
| 1 | Foster + Partners | |
| 2 | BDP | |
| 3 | Zaha Hadid Architects | |
| 4 | Allford Hall Monaghan Morris | |
| 5 | Sheppard Robson | |
| 6 | Allies and Morrison | |
| 7 | Hawkins\Brown | |
| 8 | Atkins | |
| 9 | Grimshaw | |
| 10 | Scott Brownrigg | |
| 11 | Purcell | |
| 12 | Squire and Partners | |
| 13 |
Stride Treglown | |
| tp bennett | ||
| 15 | PLP Architecture | |
| 16 | EPR Architects | |
| 17 | Feilden Clegg Bradley Studios | |
| 18 | AHR | |
| 19 | PRP | |
| 20 | Pollard Thomas Edwards | |
| 21 | WilkinsonEyre | |
| 22 | Broadway Malyan | |
| 23 | Pascall+Watson | |
| 24 | Make Architects | |
| 25 | Chapman Taylor | |
| 26 | Levitt Bernstein | |
| 27 | ADP | |
| 28 | 3DReid | |
| HTA Design | ||
| NORR | ||
| 31 | Fletcher Priest Architects | |
| 32 | HLM | |
| 33 | Ryder Architecture | |
| 34 | Hopkins Architecture | |
| jmarchitects | ||
| 36 | Donald Insall Associates | |
| 37 | Eric Parry Architects | |
| 38 | Glenn Howells Architects | |
| 39 | SimpsonHaugh | |
| 40 | BuckleyGrayYeoman | |
| KSS | ||
| 42 | FaulknerBrowns | |
| 42 | NPS Group | |
| 44 | Darling Associates | |
| 45 | bptw partnership | |
| Corstorphine + Wright | ||
| Farrells | ||
| Jestico + Whiles | ||
| 49 | Bond Bryan | |
| JTP | ||
| Weston Williamson + Partners | ||
| 52 | Aukett Swanke | |
| PDP London | ||
| Stockwool | ||
| 55 | Ellis Williams Architects | |
| John Robertson Architects | ||
| Perkins+Will | ||
| Pick Everard | ||
| 59 | AWW | |
| HOK | ||
| 61 | Chetwoods | |
| DLA Design | ||
| 63 | Assael Architecture | |
| Bryden Wood | ||
| 65 | DarntonB3 | |
| Formation Architects | ||
| MaccreanorLavington | ||
| 68 | Orms | |
| Todd Architects | ||
| 70 | Comprehensive Design Architects | |
| LSI Architects | ||
| 72 | Flanagan Lawrence | |
| Nicholas Hare Architects | ||
| Rolfe Judd | ||
| 75 | 5plus Architects | |
| Architype | ||
| Keppie Design | ||
| Populous | ||
| TateHindle | ||
| 80 | Pozzoni | |
| 81 | Holmes Miller Architects | |
| 82 | The Harris Partnership | |
| Leonard Design | ||
| R H Partnership Architects | ||
| 85 | CZWG | |
| Lewis & Hickey | ||
| maber | ||
| Stephen George + Partners | ||
| 89 | Associated Architects | |
| Page\Park Architects | ||
| rg+p | ||
| 92 | Child Graddon Lewis | |
| Holder Mathias | ||
| 94 | Fairhursts Design Group | |
| MSMR Architects | ||
| Pattern Design | ||
| 97 | Capita ESA | |
| 98 | ADAM Architecture | |
| Buttress | ||
| GRID Architects | ||
| Powell Dobson Architects | ||
| 100 | CPMG | |
| Hadfield Cawkwell Davidson | ||
| MICA Architects | ||
| Michaelis Boyd | ||
| Reiach and Hall |