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About us

We are an amalgamation of Gerry Cahill Architects Ltd., established in 1984 and McQuillan Architects Ltd., established in 2000.

We are very experienced and passionate about the design and construction of buildings, through all the different stages.

We have completed projects of all scales and complexities, from one-off building conversions to the master-planning and urban design of neighbourhoods.

Throughout, we value quality, craftsmanship and teamwork, whether it is through the pursuit of impeccable building detail or the collaboration with other professionals.

We are design and innovation leaders in our profession, having also written, published and exhibited in Ireland and abroad, with many awards recognizing what we do and do well.

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GERRY CAHILL AADipl FRIAI RIBA was educated at University College Dublin and the Architectural Association London.

Qualifying from the AA in 1975 he worked on housing and urban renewal projects in London. On his return to Dublin in 1978 he was awarded the Cement Roadstone Housing Research Fellowship in University College Dublin (UCD). This led to the publication of BACK TO THE STREET (1980) proposing how the Liberties – a Dublin Inner City neighbourhood – could be regenerated.

Since the early 1980s he has been principal in GCA GERRY CAHILL ARCHITECTS – a practice that has established a reputation for the design of high quality projects in multiple sectors . GCA has received numerous awards for its work from the Irish Concrete Society, the Architectural Association of Ireland (AAI), the Royal institute of Architects of Ireland (RIAI) and OPUS including in 2007, the RIAI SILVER MEDAL FOR HOUSING. In 2001

Gerry Cahill was personally given the LORD MAYORS AWARD for his contribution to Dublin. A lifelong commitment to energy conscious design saw Gerry Cahill appointed in the 1990s to the board of the charity ENERGY ACTION and subsequently to the board of the statutory SUSTAINABLE ENERGY AUTHORITY OF IRELAND (SEAI) from 2001 to GCA is also a member of the EUROPEAN GREEN CITIES NETWORK.

Gerry Cahill has taught at the UCD SCHOOL OF ARCHITECTURE in undergraduate and postgraduate courses since 1978 and has lectured internationally in Europe and North America. In the late 1980s he co-ordinated and edited DUBLIN CITY QUAYS : PROJECTS BY THE SCHOOL OF ARCHITECTURE UCD an exhibition and publication which is acknowledged as influencing the renewal of the capital city. Among his ongoing teaching roles he is currently co-ordinator of the UCD STUDY ABROAD PROGRAMME to encourage international students to select Ireland as a place of further learning and inspiration.

Gerry Cahill’s drawings and sketches have been exhibited by the RIAI and published in the WHOSEDAY book in 2000. His sketchbooks remain on display since 2010 as part of THE SECRET LABORATORY a travelling exhibition organized by the University of Ulster.

In 2008 GCA GERRY CAHILL ARCHITECTS represented Ireland with the audio visual exhibit SANCTUARY + CONGREGATION as part of the LIVES OF SPACES installation at the 11th ARCHITECTURAL VENICE BIENNALE In Italy.

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Ben Duffy



UNA MCQULLIAN B.A. (Hons) Architecture, B.Arch (Hons), MRIAI

Una is originally from Belfast but spent many years studying and working abroad before returning to Ireland to work and set up practice in Dublin. She obtained a Bachelor of Arts Honours degree B.A. (Hons) from the University of Kingston-Upon-Thames in England, a Bachelor of Architecture B.Arch (Hons) from the University of Newcastle-Upon-Tyne in England, completed her professional studies in University College Dublin and was elected a Member of the Royal Institute of the Architects of Ireland (MRIAI) in 2001.

She has also been registered in the Register for Architects under the Building Control Act 2007 and may legally use the title Architect and she is an Architect Accredited in Conservation Grade III and a Member of Integrated Project Management (IPM). She spent a year working in San Francisco, specialising in housing design, construction and interiors and she was a founding member of the Bay Area Young Architects (BAYA). She spent a further year working on the detailing and construction of the 5 Star Hotel Arts, working on site in the Olympic Village of Barcelona, after the Olympics but before the Olympic Village area was completed. In Dublin, Una worked for BDP, intensively on the Connolly Station refurbishment project, the competition-winning offices for Fingal Co. Council along with Bucholz McEvoy Architects, the extension to Marks & Spencer Mary Street, the refurbishment of AIB Bank Terenure amongst many other prestigious schemes.

Prior to starting her own practice, Una then worked exclusively with Anthony Cotter Architects on the new-build of the large Air-Rights Office Building over Connolly Station. Una worked single-handedly with Tony on the entire project from start to finish, including the fit-out of the offices for McKeever Rowan Solicitors and Susquehanna Ireland Ltd.; the entire second floor of the building. McQuillan Architects was set up as a limited Company in 2001 to meld the disciplines of art and business in a way to also create beautiful environments for people.

Since then, Una’s expertise has made her a natural commentator and media presenter. To date she has worked on the series ‘About the House’, for Ireland’s national television station, RTE 1, where she was the co-presenter. Una also regularly appears in the Irish press as an expert on interiors, architecture and the industry.

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Ben Duffy
Macca Architecture ltd. 19a Upper Baggot St., Dublin 4.
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