Assessment and Maintenance of Existing Buildings

Investigations & Appraisals

Investigation & Appraisals of Existing Buildings

With a history that spans over 60 years, investigation and appraisal work has been a core part of our business since the beginning.

Our approach continually adapts as legislation evolves and changes, meaning that clients can rely on our thorough and comprehensive understanding of any regulations and constraints on their behalf.

 Our Approach:

  • Preliminary Risk Assessment – review of information, inspection, and initial structural risk assessment

  • Detailed Risk Assessment – inspections, surveys, monitoring and testing, and more detailed structural risk assessment

  • Management and Remediation Strategy


Reinforced Aerated Autoclaved Concrete (RAAC)

We are one of the UK's leading consultancies in identifying, assessing and managing RAAC. Our approach and methodology is developed in response to the latest industry guidance and we have multiple registered RAAC specialists who act as advisors to the IStructE. 

Our clients come to us for our robust, accurate and reliable approach, and the organisations we work with include Government Departments and Estates teams in the NHS, the Department for Education, Local Authorities, and Blue Light organisations.

We offer the service of ‘RAAC Advisors’; providing structural engineering consultancy to support our clients' strategic brief and project protocols. Our relationship goes well beyond the initial stages though, and we can work together with our clients to provide training and support for the ongoing project management.

Hard hat

Building Safety Act

We help clients to meet the requirements of the Building Safety Act. This includes initial surveys and desktop studies, external visual inspections, exploratory intrusive investigations, testing and reporting.

We also provide advisory services on the structural failure elements of the Building Safety Case documentation. This can be used for submission to the Building Safety Regulator.

Housing Investigations, Appraisals, and Repairs

Forty years ago we wrote the very first licensed repair scheme, and since then our approach to innovative and cost-effective solutions for non-traditional and high-rise housing has continued to build meaning we are leaders in the sector.

Our national team of experts have been instrumental in the development of alternative forms of repair for non-traditional (low, medium) and high-rise housing, and we continue improve safety and extend the design life of these types of buildings.

Since the 1980's we have investigated and repaired over 50,000 dwellings, and carried out over 250,000 property stock condition surveys.

Survey non traditional home
LPS Solution

LPS Solution

Our innovation for pre-cast Large Panel System (LPS) high-rise buildings removes the potential risk of disproportionate collapse in the event of gas explosions, which adversely affects this form of construction. Our solution requires the decant of certain floors only, rather than the whole block, and results in a significantly safer, warmer, more attractive, and sustainable place to live, with improved thermal performance.

Our Investigations & Appraisals Projects

Windmill Green Manchester

Also known as 24 Mount Street, this BREEAM Outstanding office building boasts rooftop terraces and up to 13,000sq ft of workplace suites.

Windmill Green (24 Mount Street), Manchester

Albert Dock, Liverpool
Mixed Use Regeneration

Engineering to save the Albert Dock from demolition, followed by 40 years of continuous involvement.

Albert Dock, Liverpool

Wilmcote House (EnerPHit)

The three 11-storey residential blocks provide 107 affordable homes for Portsmouth City Council.

Wilmcote House (EnerPHit)

Keynsham Park Memorial Bridge
Sports & Leisure

The creation of this outstanding 15m span footbridge over the river in Keynsham has reinstated a vital link for the local community in a much-loved public park.

Keynsham Park Memorial Bridge

Further Reading

See More
15th Mar 24

Kamal Fuller Contributes to IStructE RAAC Training Course

Kamal Fuller, Structural Engineer in our Leeds office has contributed to the IStructE’s on-demand course on ‘RAAC Essentials for Structural Engineers’.

Kamal Fuller
23rd Feb 24

Janice Smith Presents on RAAC for IStructE and APSE

As one of Curtins’ leading specialists on RAAC, Janice Smith, Director – Scotland was invited by both the IStructE and APSE to present on the topic during February.

Janice Smith
31st Jan 24

Living with RAAC

Andrew Macfarlane joins Sean Keyes from Sutcliffe to speak on the topic of 'Living with RAAC' at the ACE's February session.


Our Values

Being Human

We value people as people. We believe in fostering meaningful human connections that speak to the hearts and minds of our stakeholders, to build strong powerful relationships and communities that thrive and flourish.


We say what we mean and mean what we say. Integrity lies at the heart of everything we do. It is the constant in the choices we make which builds trust, honesty, fairness, and respect for our colleagues and our clients alike.


Impact demonstrates the immeasurable power of our shared values and collective effort to effect positive, ground-breaking change and deliver excellence for our customers, colleagues, and the communities we serve.


We foster a culture of curiosity to help us constantly improve our work, inspire others to do better and think bigger, and to never stop learning.

Contact Curtins

Let’s talk about your next project and how our experienced team can help

Find your nearest Curtins office