023 9278 3853 07885 594902

Extensions and Loft Conversion Specialists

C. Marks Construction is based in Portsmouth, Hampshire and is a professional and reliable building company with over 30 years of experience. All of our work is completed to a high standard of workmanship by fully trained and qualified tradesmen. We offer a full range of building services to both the public throughout Hampshire and surrounding areas.

  • Building Maintenance & Repairs
  • Renovations
  • Alterations
  • Home Improvements
  • Kitchens and Bathrooms
  • Loft Conversions & Extensions
  • Driveways and Patios
  • Brickwork
  • Plastering & Rendering
  • Garages & Conversions
  • Carpentry
  • Decorating
  • Plumbing
  • Staircase Construction

Improving, renovating or building a new home involves a lot of personal choices, one of the most difficult being the choice of building services company to work with. With years of extensive knowledge, experience and project management within the building industry, we are able to offer a professional, high quality, bespoke and friendly service. You can be assured of a reliable, quality service, on budget and on time.


I am very pleased indeed with the work Chris has done. He would be my first port of call if I need anything else done and I would certainly recommend him.

Many thanks for your help and may I take this opportunity to compliment your company on the quality of your work. Our money has been well invested.

The garage and extension look lovely. Thanks for a brilliant job and treating my home with respect as if it were your own. I will miss all of your lads.

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023 9278 3853 07885 594902