Structural calculations for your home renovation

( Without the faff voicemails unresponded emails endless delays mumbo-jumbo excuses )

Projects Since 2012
0 +

A straight-forward structural calculations service for homeowners.

Rapid Turnarounds

Turnaround in as little as 72 hours from instruction

Free Change Request

One free change request per project (Ts&Cs apply)


All structural calculations needed for building control submission

Fully Insured

Professional indemnity up to £1.5m for each claim

Quality Assured

We have ISO 9001:2015 certified quality systems.

Card Payments

Visa and Mastercard debit and credit cards accepted

We have a 100% success rate in obtaining building regs approval for our structural calculations.

An Online Structural Calculations Service for an Online World

Calcs-Online specialises in providing structural calculations for domestic residential alterations in the UK. We work predominantly with home-owners; facilitating loft conversions, extensions, and new-build dwellings nationwide.

When you’re looking for a structural engineer for your project, you want an established company that’s a safe pair of hands and has the right insurance. They should have an established quality system, good response times, and most of all, they should leave out the mumbo-jumbo and get the job done. That’s what we’re here for.

Extension structural timber mullions

“Really, great service that’s very customer-focused. Flexible on small changes and with competitive prices.”

Jason, Homeowner

Structural Calculation Projects

Our Vision

Quality is at the heart of everything that we do at Calcs-Online.

This means providing a quick and effective service that homeowners know they can rely on to do the job. It means stripping out the technical jargon and speaking in a language that you can understand. It means doing the job that we quoted on for a fair price that won’t change. It means having a responsive technical support team available until the job is finished and the customer satisfied…. Most of all, though, it means day-by-day, year-by-year, striving for continual improvement in everything that we do.

Our goal is to make your experience of obtaining structural calculations for your project effortless, and worry-free. If you want a safe pair of hands to look after the structural calculations for your project you needn’t look further.

Sam Dean CEO

0208 183 4321 |

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