Private company

Allford Hall Monaghan Morris

UK architecture firm

Allford Hall Monaghan Morris (also known as AHMM) is the fourth-largest architecture practice in the United Kingdom with offices in London and Bristol, as well as international studios in Madrid, Sydney and Oklahoma City. AHMM was established in 1989 by Simon Allford, Jonathan Hall, Paul Monaghan and Peter Morris. The practice has since grown to more than 400 employees.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

1989Founded1

Allford Hall Monaghan Morris (also known as AHMM) is the fourth-largest architecture practice in the United Kingdom with offices in London and Bristol, as well as international studios in Madrid, Sydney and Oklahoma City. AHMM was established in 1989 by Simon Allford, Jonathan Hall, Paul Monaghan and Peter Morris. The practice has since grown to more than 400 employees.2

The story

Founded in 1989 by Simon Allford, Jonathan Hall, Paul Monaghan and Peter Morris, who met at the Bartlett School of Architecture, the practice employs over 400 people working on projects in education, healthcare, housing, arts and offices. In 2017, it became majority employee-owned through an employee ownership trust.

In March 2020, the Twentieth Century Society criticised AHMM's "heavy-handed" plans to revamp Denys Lasdun's IBM building on London's South Bank. Some five years later, the same organisation, plus Historic England, criticised AHMM's "harmful" proposals for another Lasdun-designed London building, Milton Gate.

During the first year of the COVID-19 pandemic, AHMM reported a 22% drop in revenue from £55.3 million in 2020 to £43.3m in 2021, and an operating loss of £587,000 (compared to a profit of over £6m in 2020). Average employee headcount in the year to 30 March 2021 was 486. It made further losses in the next two financial years—£1.0m in 2021–22 and £1.9m in 2022–23—while 2023 revenue rebounded to £49.9m. During the year to March 2024, AHMM cut 129 jobs (422 staff remained) at a cost of over £3m, and reported a fourth consecutive annual loss of £1.4m on global revenue of £46m (£41m deriving from the UK).

In August 2020, Simon Allford was elected to be president of the Royal Institute of British Architects; serving a two-year term, he succeeded Alan Jones on 1 September 2021. In early April 2022, a RIBA walking tour of London's Barbican Estate was ambushed by residents protesting against AHMM's involvement in a 24-storey tower at Houndsditch, claiming it will cause loss of light to flats and community amenity areas. A leaflet asserted: "Allford used his RIBA position to push forward plans that will blight the lives of Middlesex Street Estate residents in the east of the City."

In September 2025, residents of an AHMM-designed building—a 35-storey tower block, The Fold, completed in 2022 in Croydon, south London—were told they must leave the building after fire safety issues were found.

From Wikipedia’s article on Allford Hall Monaghan Morris, shared under CC BY-SA 4.0.3

Timeline

  1. 1989Founded Founded1

Sources

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