Castellum offers both a turnkey Design and Build solution and Main Contracting.

The management team has extensive construction experience, but also expertise with project and operational management. We strive to bring value to our clients and deliver projects of the highest quality by uniting these skills.

We recognise the importance and appeal of discretion and each project is managed at Board Director level.

Projects range from new builds, to agricultural conversions and the refurbishment and extensions of existing homes, including listed buildings and country house estates.

We focus on delivering high quality, intelligent and creative solutions. This, combined with our energy, enthusiasm and attention to detail is paramount to our business ethos.

Our formula is simple; we deliver projects that both we and our clients are proud of.


  • Project sourcing
  • Full design & build service
  • Main contracting
  • New build
  • Refurbishment
  • Internal fit-out
  • Restoration
  • Alterations
  • Extensions and basements
  • Project management
  • Cost advice
  • Space planning & design
  • Interior design and liaison
  • Development appraisal
  • Planning & conservation
  • Property investment


From the bottom of my heart, you guys deserve this. The quality of my home is impeccable. Kudos to you and the team. The biggest award is that I am entirely satisfied!

Private Client, Surrey – on hearing that his home had won an award.

Best Family Home outside of London – Evening Standard Awards
Some of you may know that I work with contractors, from the largest down, and I can honestly say, if given a choice, Castellum are now first on the list. If you are building something, give them a call.

Jayne McGivern

Board Member of Skanska

The Main Contractor by which all others should be judged. Nothing ever too difficult – team players.

J. Hunter

Founder of Tenhurst