Janus Conservation Ltd

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Janus Conservation Ltd Expert Histoirc Building Surveyors & Heritage Consultants

Building Surveys : Heritage Planning : Project Delivery

Thame - London - Epping

Janus Conservation Ltd is a Royal Institution of Chartered Surveyors (RICS) regulated firm and recognised Historic Environment Service Provider (HESPR) operating exclusively in the heritage sector from our offices in Mayfair, London and Thame, Oxfordshire. We specialise in the survey, repair, alteration and management of projects to some of the United Kingdom’s finest and most cherished historic buildings, structures and monuments. We have the required qualifications, skills, knowledge and experience to ensure that your heritage asset is treated with the utmost care and attention, and we pride ourselves on providing the highest level of customer service and discretion.

A little architectural history for you!Did you know that legislation passed in 1709 helped change the way London was bui...
17/10/2026

A little architectural history for you!

Did you know that legislation passed in 1709 helped change the way London was built?

We're looking back at a fascinating survey our conservation surveyors carried out on a terrace of Grade I listed houses in Islington, dating from 1658 — making them rare survivors of London before the Great Fire of 1666.

Buildings like these have witnessed centuries of change, including the introduction of legislation that helped shape the capital's architecture.

Their survival is a wonderful reminder of why careful maintenance, informed repair and thoughtful conservation are so important in preserving our architectural heritage for future generations.

We’re delighted to share that Janus Conservation was recently appointed as lead consultant for the repair and conservati...
16/10/2026

We’re delighted to share that Janus Conservation was recently appointed as lead consultant for the repair and conservation of the Grade I listed Wallingford Town Hall.

Standing at the heart of Wallingford since 1670, this remarkable building has been part of the town’s story for over 350 years, witnessing generations of civic life, trade, celebrations and community gatherings.

Its architecture has quite a story to tell, too. From its original open ground-floor loggia and timber-framed upper storey to the later alterations that introduced its distinctive Neoclassical character, the Town Hall reflects centuries of architectural change.

We’re thrilled to be playing a part in the next chapter of this historic building, helping to ensure it continues to be enjoyed by the community for generations to come.

We look forward to sharing more as the project progresses!

In recent months, our conservation surveyors had the pleasure of working on several Grade II and Grade II* listed proper...
14/10/2026

In recent months, our conservation surveyors had the pleasure of working on several Grade II and Grade II* listed properties across the Cotswolds, undertaking Type 2 and Type 3 Condition Surveys.

From traditional Stonesfield slate roofs to honey-coloured limestone and beautifully crafted architectural details, the Cotswolds has a remarkable built heritage. Each village, and indeed each building, has its own character and story to tell.

One particularly fascinating property we surveyed was built by Thomas Strong, Sir Christopher Wren’s master mason at St Paul’s Cathedral — a wonderful connection to one of Britain's most celebrated architectural landmarks.

It's buildings like these that remind us why understanding traditional materials, craftsmanship and the evolution of a building is so important.

Our role is not simply to identify defects, but to understand the building as a whole, helping to ensure these remarkable historic properties are cared for and conserved for generations to come.

What are the chances of finding our own logo carved into a centuries-old building?During a survey of a Grade II listed p...
13/10/2026

What are the chances of finding our own logo carved into a centuries-old building?

During a survey of a Grade II listed property, originally a hall house, one of our heritage consultants spotted a daisy wheel — the very symbol featured in our Janus Conservation logo — carved into the timber of a fireplace.

Known as witches’ marks or apotropaic symbols, these fascinating carvings were traditionally believed to protect buildings and their occupants from evil spirits and misfortune.

It's discoveries like these that make exploring historic buildings so rewarding. And finding a little piece of our own identity hidden in the building's fabric makes this one particularly special!

Façade retention + internal wall insulation: how much is enough?IWI can make traditional solid walls colder, reducing dr...
07/10/2026

Façade retention + internal wall insulation: how much is enough?

IWI can make traditional solid walls colder, reducing drying and increasing moisture risk to timber lintels, embedded metalwork and other thermal bridges.

Mineral wool may be vapour permeable, but systems incorporating an Air and Vapour Control Layer (AVCL) rely heavily on airtightness and careful detailing.

Sometimes a thinner, capillary-active solution such as wood fibre, cork or insulating lime/hemp may be more appropriate.

With traditional buildings, the aim shouldn’t simply be the lowest U-value possible, but worthwhile improvement without compromising the long-term durability of the retained fabric.

🎓 We’re a Graduate Conservation SurveyorJoin Janus Conservation and start your career working across building surveyin...
23/04/2026

🎓 We’re a Graduate Conservation Surveyor

Join Janus Conservation and start your career working across building surveying, heritage consultancy, and project delivery - gaining hands-on experience with historic buildings from day one.

Based in Thame, this is a rare opportunity to develop as a well-rounded conservation professional, supported through a structured training pathway towards RICS and IHBC qualification.

To apply, send your CV and a short cover letter to: [email protected]

Last week, our conservation surveyors were on site in Harlow, carrying out a heritage window appraisal and preparing a H...
04/02/2026

Last week, our conservation surveyors were on site in Harlow, carrying out a heritage window appraisal and preparing a Heritage Statement for a mid-18th-century house with a partially timber-framed structure and later 19th-century alterations.

One of the most rewarding parts of this work is uncovering how historic buildings evolve over time. Through historic mapping and archival imagery, we identified that the property once formed part of a larger group of buildings, providing valuable insight into the site’s development and how the surviving structure sits within its wider historic context.

We’ve recently been preparing a Heritage Statement for a lovely 18th century house in the heart of an Oxfordshire villag...
22/09/2025

We’ve recently been preparing a Heritage Statement for a lovely 18th century house in the heart of an Oxfordshire village. The building’s current custodians are planning a series of repairs and refurbishments to support its continued domestic use. With its vernacular character forming a key part of its significance, and its location within a conservation area, understanding the wider context has also been essential to our work.

As part of our research, we uncovered several historic images of the property. What’s striking is how little the scene has changed over the years. The continuity of the street, with its familiar rooflines and frontages, is a reminder of the resilience of historic places and the enduring character of village life.

We recently undertook a condition inspection of Newbury Town Hall, a Grade II listed civic landmark in the heart of the ...
27/08/2025

We recently undertook a condition inspection of Newbury Town Hall, a Grade II listed civic landmark in the heart of the Market Place.

Designed by James H. Money in 1876, the building draws on the Gothic Revival style popularised by Alfred Waterhouse. Its polychrome brickwork, steep tiled roofs, arched windows and prominent clock tower remain a distinctive feature of the townscape.

Our inspection focused on the principal elevations and incorporated drone photography to document areas not easily visible from ground level - helping to build a clear, visual record to support ongoing care and maintenance.

Thanks to Newbury Town Council for the opportunity to assist in the stewardship of this important building.

Last week, our historic building surveyors carried out a domestic condition survey of a flat in this striking 1936–7 Art...
08/08/2025

Last week, our historic building surveyors carried out a domestic condition survey of a flat in this striking 1936–7 Art Deco–Art Moderne high-rise in Marylebone.

Working with buildings from this period offers valuable insight into 20th-century construction and design—an important part of our historic built environment that deserves careful consideration.

Address

The Sanderum Centre, 30A Upper High Street
Thame
OX93EX

Opening Hours

Monday 8:30am - 5pm
Tuesday 8:30am - 5pm
Wednesday 8:30am - 5pm
Thursday 8:30am - 5pm
Friday 8:30am - 5pm

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