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About Us

Janus Conservation Ltd is a specialist historic building surveying and heritage planning consultancy, with offices in Thame, Oxfordshire, Bloomsbury, London and Epping, Essex.

We deal exclusively with the historic environment, working with both commercial and private/residential clients along with major landowners such as the National Trust and Royal Household. We are both RICS Regulated and an IHBC recognised Historic Environment Service Provider. 

We pride ourselves on providing meaningful and pragmatic advice with an industry-leading customer experience.     

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Our Team

rupert1

Rupert Hilton

Director
Historic Building Surveyor & Heritage Consultant

Elsa Sibley

Elsa Sibley​

Historic Building Surveyor

Millie Totman​

Millie Totman​

Heritage Consultant​

Claire

Claire Lambert​

Accounts Manager

The Climate Change

The Climate Pledge

In August 2021, Janus Conservation joined a group of highly influential organisations by signing up to The Climate Pledge and committing to reaching net-zero carbon emissions by 2040. Committing to the Pledge further reinforces Janus Conservation’s wide-ranging focus on sustainability.

Fill out the form below to speak with a heritage professional today.

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© 2025 Janus Conservation Ltd

Janus Conservation Ltd Registered office address:
The Sanderum Centre
30A Upper High Street
Thame, Oxfordshire
OX9 3EX

Company number: 12336058
VAT number: 338898435

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Rupert Hilton

Rupert Hilton

Director

  • RICS Conservation Accredited Building Surveyor
  • CIOB Conservation Certified Specialist
  • MScCHE, BA(Hons), IHBC, MCIOB

Rupert is an accomplished historic building surveyor, construction manager and heritage consultant, and one of only a handful of practitioners in the UK to hold full conservation accreditations with the Royal Institution of Chartered Surveyors (RICS), the Chartered Institute of Building (CIOB) and the Institute of Historic Building Conservation (IHBC). In addition, he is now seeking to become a full member of the Institute of Conservation (ICON) – illustrating his passion for the historic environment.

Having previously worked for a number of very well-respected companies, Rupert quickly established himself as one of the most versatile, qualified and capable conservation practitioners in the country, before founding Janus Conservation in January 2020.

He currently acts as a quinquennial inspector to numerous historic churches, including being named surveyor of the fabric to Nicholas Hawksmoor’s iconic grade I listed Christ Church, Spitalfields in 2022.

Rupert is now particularly interested in ‘retrofit’, making responsible and technically compatible improvements to the energy efficiency of historic buildings, and is a qualified Retrofit Designer for Pathway C (High-Risk Schemes) under PAS 2035.

Elsa Sibley

Elsa Sibley

Historic Building Surveyor

  • BSc (Hons), AssocRICS, AssocIHBC

Elsa joined Janus Conservation as a Graduate Historic Building Surveyor in January 2024 and has since been promoted several times, establishing herself as an accomplished Contract Administrator with robust technical expertise and specialist conservation knowledge. She is an Associate Member of both the RICS and IHBC and is part of Janus Conservation’s Emerging Leaders Initiative, reflecting her commitment to professional growth and leadership in the sector.

With a First Class Honours BSc in Real Estate from the University of Westminster (2024) and four years of prior experience as a rotational apprentice surveyor, Elsa brings a strong property background to her conservation practice. This allows her to manage the delivery of heritage projects with precision — from technical specification and contract management to ensuring compliance with conservation principles and statutory requirements.

Elsa combines her technical proficiency with a clear understanding of heritage value, enabling her to balance practical project delivery with the sensitive needs of historic buildings and sites. She is progressing towards Chartered Building Surveyor status with the Royal Institution of Chartered Surveyors and full membership of the Institute of Historic Building Conservation.

Millie Totman

Millie Totman

Heritage Consultant

  • MSc, BA

Millie is a Heritage Consultant at Janus Conservation, specialising in the assessment, management, and conservation of historic buildings and sites. She works first-hand on complex cases, balancing the practical and legislative demands of heritage conservation.

Since completing her MSc in Historic Building Conservation at Kingston University London, Millie has built on her strong academic foundation to deliver professional consultancy across a wide range of projects. She combines rigorous research and analytical thinking with clear communication, ensuring that solutions are both robust and accessible to clients, stakeholders, and planning authorities.

With a background in History (BA Hons, University of Nottingham, First Class), Millie has particular expertise in archival research, which she applies to inform conservation strategies and heritage statements. Her ability to synthesise historical evidence with present-day requirements allows her to approach projects with both depth and practicality.

Millie is currently working towards full membership of the Institute of Historic Building Conservation (IHBC) and is part of Janus Conservation’s Emerging Leaders Initiative, reflecting her commitment to professional development and leadership within the sector.

Claire Lambert​

Claire Lambert

Accounts Manager

  • BSc (Hons), Cert Acct (Open)

With a background in practice management and finance, Claire joined the Janus team in early 2022.  She holds a Professional Certificate in Accounting plus a bachelor’s degree in Psychology with a special interest in Organizational Psychology.

Claire works closely with other Janus team members in order to deliver an efficient, friendly and customer-focussed accounts service.