Price List

See our price list below to get an idea of how we structure our pricing... Put simply, a larger and more complicated project is going to be more expensive than a small and simple project!

The table below shows the pricing for our "Standard" Service, however we also offer a "Priority" Service for those who need their calculations "yesterday".

Priority Service

Documents usually returned around 1 week after instruction (sometimes quicker!)

Standard Service

Documents usually returned around 2 weeks after instruction (sometimes quicker!)

Our service includes

  • PI insurance cover up to £1.5m.

  • Virtual consultation with your dedicated “Project Coordinator”.

  • A free change request (assuming no significant architectural changes).

  • Phone lines open 9-5.

  • Email responses within 1 working day.

  • Access to our Interactive Knowledge Base.

The prices shown below are subject to a 50% premium for the quick turnaround service.  Prices shown include VAT.

Project ScopeLower Estimate (e.g. Mid-Terrace)Upper Estimate (e.g. Complex Detached House)
Loft Conversion Calculations£395£995
Single Storey Extension Calculations£395£1295
Two Storey Extension Calculations£395£1295
Loft + Single Storey Extension Calculations£695£1995
Loft + Two Storey Extension Calculations£695£1995
Loft + Single Storey + Two Storey Extension Calculations£995£2995
New-Build Calculations£395£2995

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

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