Established in 1988, DP Architects is based in an attractive listed building conveniently located in Watlington, Oxfordshire on the edge of the Chilterns. We specialise in all aspects of Design, Planning and Architecture.

Our dedicated team of Chartered Architects, Designers, Planners and Technologists are committed to delivering high quality design and services tailored to suit your specific requirements.


  • Full architectural services
  • Interior design detailing
  • Development, design & planning consultancy
  • Enhancing existing planning permissions
  • Initial planning & feasibility reports
  • Complex & challenging sites
  • Passivhaus & sustainable design
  • Conservation & listed buildings
  • Masterplanning
  • Barn conversions & Class Q
  • Green Belt design
  • Permitted development / Certificates of lawfulness


Mark Longworth


Mark Longworth is a Chartered member of the RIBA and joined DP Architects in 1997. Mark has extensive planning and design experience, including strategic and local plan representation. Mark has a love of historic restoration projects, new dwelling design, Arts & Crafts, Art Deco and Contemporary Design, as well as promoting Passivhaus in affordable housing projects. Mark is a local Parish Council Chairman and was previously a board member of a local Community Land Trust.

Stewart Green


Stewart is a Chartered Architectural Technologist with over 30 years of experience within the industry and has been associated with DP Architects since 1994. His main areas of specialty and interest include; one-off bespoke contemporary and traditional design, barn conversions, listed buildings and conservation / restoration work. In his spare time Stewart enjoys cooking, growing chillies and Bonsai trees, collecting vinyl and keeping fit.

James Kestell-Cornish


James is a Chartered Architectural Technologist and has been with the practice since 2005. James has a broad level of experience in providing full architectural services on a diverse range of projects, from small scale extensions to bespoke high end dwellings. His extensive technical knowledge of sustainable construction methods, meticulous attention to detail and contractual background adds value to any form of development. Outside of work, James loves the outdoors and enjoys coaching grass roots football.

Amanda Walker

BA(Hons) DipArch PGDipDP RIBA

Amanda Walker has over 20 years’ experience as a qualified Architect and 9 years as a Director at the practice. An accomplished designer specialising in planning, Amanda is also skilled in providing initial planning expertise, including site analysis and initial block plans. She has extensive knowledge of conservation architecture having worked on extensions and refurbishments of listed buildings. Amanda is also a volunteer for STEMnet, an organisation which encourages ‘STEM’ subject advocation in both junior and senior schools.

The Old Brewery Tap

DP Architects is based in an attractive brick and flint, grade II listed former public house and brewery.  We are situated in the heart of the picturesque Chilterns market town of Watlington, only 5 minutes from the M40.  Secure client parking is available in our private cobbled courtyard to the rear of the building.


DP Architects have been finalists and winners for multiple design, quality and technical awards since the company was established. Here is a selection of some of our awards …

Chilterns building design award 2019

LABC award 2016-2019

Inside Housing Development Award 2018

Sustainable Building Awards 2019

UK Property Award 2016-2019

AVDC award 2013-2016

Green Apple Award, 2015, 2018-19

24 housing award 2018

What House? Award 2019