Renovation Notes is an independent library of UK renovation guidance: costs, planning, building regulations and structure. It is free to read and carries no advertising and no affiliate links. Journalists are welcome to quote our figures and to ask for comment.

Who to quote

Gediz Karaca, founder and editor of Renovation Notes

The photograph above is free to use with a story about Renovation Notes.

Gediz Karaca, MBA, MSc, founder and editor of Renovation Notes. A civil and geological engineer by training, with a decade in construction management on projects worth over $1bn. He writes and prices the notes, and can explain what a figure means and where it comes from.

Topics he can speak on

  • Renovation and extension costs
  • Loft conversions
  • Rear and side extensions
  • Building regulations and building control
  • Party wall matters
  • Conservation areas and Article 4
  • Trade day rates
  • Structural alterations and steel beams
  • Withdrawn British Standards
  • Sequencing and running a build

Biographies

Ready to paste, at three lengths.

Short

Gediz Karaca is founder and editor of Renovation Notes. A civil and geological engineer by training, he spent a decade managing construction projects worth over $1bn.

Medium

Gediz Karaca is founder and editor of Renovation Notes, an independent library of UK renovation guidance. A second-generation construction professional and a civil and geological engineer by training, he spent a decade in construction management on skyscrapers, bridges, water networks and subway stations worth over $1bn. He holds an MBA from the University of Oxford and an MSc in Construction and Engineering Management. He is based in London.

Long

Gediz Karaca is founder and editor of Renovation Notes, an independent library of UK renovation guidance covering costs, planning, building regulations and structure. A second-generation construction professional and a civil and geological engineer by training, he spent a decade in mega-project construction management, leading the development of over $1bn of assets including skyscrapers, bridges, water distribution networks and subway stations. He then spent eight years as chief executive of a venture-backed engineering spinout from the University of Oxford, where he co-invented its core technology, raised more than £15m and built a team of over 30. He stepped down as chief executive in October 2025 and remains on the board. He holds an MSc in Construction and Engineering Management from Boğaziçi University and an MBA from Oxford’s Saïd Business School, and is based in London.

Figures you can use

Everything below may be quoted or reproduced, including commercially, with credit to Renovation Notes and a link to the page the figure came from.

  • UK Renovation Cost Index. 82 itemised 2026 costs in 13 categories, from loft conversions to trade day rates, each with its basis and the guide that evidences it. Every item has its own link. September 2026 edition, updated quarterly.
  • References library. The published sources behind the notes, tiered by the standing of the body that issued them: legislation and regulators first, then standards bodies, trade federations and consumer bodies.
  • Withdrawn British Standards register. Standards that have been withdrawn or superseded but are still being cited, dated and linked to their replacements.

How to cite

Renovation Notes, “UK Renovation Cost Index”, September 2026. https://renovationnotes.com/uk-renovation-cost-index/

Interests

Gediz Karaca advises construction companies. Renovation Notes is published by Trilit Ltd, company number 16780066.

The site carries no advertising, no sponsored placements and no affiliate links. No company pays to appear in a note, in the cost index or on the map of trades, and the firms shown on that map are drawn from public vetting records rather than from anyone who asked to be listed.

Readers who want hands-on help with a project can ask for a referral on our about page, and we pass them to people we have worked with directly.