London 020 7060 6593 & Exeter 01392 555 432

Our difference

Our Mission

Is simply to help create healthier buildings and environments

Although thorough investigation and accurate diagnosis are fundamental to resolving building defects; we also know that the informed specification of materials and methodologies is vital to the success of any intervention.

“we feel we have a responsibility to provide holistic, longterm solutions, which improve the indoor environment without being detrimental to our natural environment”

Why choose us?

Harper Building Diagnostics are selected by clients who value our technical expertise, our working knowledge of buildings, associated materials and methodologies, our commitment to finding solutions to their problems, the support we provide to their project, and because of our transparent and ethical approach to doing business.


We go that extra mile in order to deliver results, whether that is during the investigative phase, or by providing further support until problems are solved, we really are here to help!

About us - Our history

Lee Harper has over 25 years experience investigating and solving material failures. His formative years as a building conservator have helped develop and refine his environmental approach to managing timber decay and damp problems.

Lee has relevant industry qualifications including MSc Timber Building Conservation, is currently studying another Masters  (Sustainable Architecture) at CAT (Centre of Alternative Technology), and is passionate about promoting building conservation and sustainability through bespoke training and presentations.

We are keen to make our services accessible to anyone affected by building defects, and although we are proud to regularly collaborative to investigate and resolve problems affecting nationally significant historic buildings, we also take great satisfaction from delivering the same level of care and commitment to private homeowners throughout the UK.

We’re a personable lot too, so please do get in touch.

We are genuinely keen to discuss your project with you

We  like to inspire and be inspired by like minded companies and individuals

Latest Posts


Covering the UK from both the Exeter and London offices

London Office:

Harper Suite 1 Crutchfield Lane, Walton-on-Thames, Surrey. KT12 2QY
Phone: 020 7060 6593

Exeter Office:

The Office, The Old Shippen, Upton, Clyst St Lawrence
Cullompton, Devon. EX15 2NP

Phone: 01392 555 432