About Us

Our story

Calcs-Online was first established in 2012 in the back room of a house in Weybridge, Surrey. The initial idea was simple: to undercut the competition on price and provide a good quality, easy-to-understand online service, with a simple pricing structure and all the jargon and gobbledigook you get with the usual engineers stripped out.

Whilst our approach may have changed since then, our guiding principles are the same – to provide a quick, simple online calculation service for homeowners with a clear pricing structure.

Calcs-Online became a trading name of PorthouseDean Structural Engineers later on in 2012.

"Mooney the office cat" in 2012 in Weybridge

“Wonderful efficient and professional service. Great communication and drawings delivered within timescale. Would highly recommend and will use again.”

Maggie, Homeowner

Our Team

Sam Dean CEO & CPO

Sam Dean BEng (Hons) co-founded Calcs-Online and PorthouseDean in 2012 with Chris Porthouse. He begun working as a trainee structural engineer in 2007 at Steve Hunt Partnership in Warrington; subsequently moving to Atkins in 2010 to work in the nuclear sector. It was here that he learnt about the implementation of quality systems to ISO9001:2015, and developed the principles of quality that are applied at Calcs-Online to this day.

Chris Porthouse COO

Chris Porthouse MEng CEng MIstructE is a chartered structural engineer and co-founder of Calcs-Online and PorthouseDean in 2012. He begun working as a graduate structural engineer in 2006 at Steve Hunt Partnership in Warrington, where he met Sam and formulated the ideas behind Calcs-Online. Chris has extensive experience as an engineer, and is an authority on the structural alteration and development of low-rise dwellings.

Chris Porthouse

Dr Guy Marshall CTO

Dr Guy Marshall MA (Cantab.) MSc CMath MIMA earned a 2.1 in Math from Cambridge, followed by a top-ranked MSc in Theoretical Physics from King’s College London. Since 2015, he’s been a tech consultant and in 2023 achieved a PhD in AI from the University of Manchester. Inspired by our tech-enabled vision, in March 2022, Guy became a co-owner and director of Calcs-Online. His goal is to oversee major projects, foster team development, and enhance tech and R&D prowess.

0208 183 4321 | info@calcs-online.co.uk

PorthouseDean Limited (trading as Calcs-Online)
Registered at Companies House in England. Company No: 08086677
VAT Registration Number 162 3045 40

Calcs Online Brought to you by PorthouseDean Structural Engineers