Knock-Through Structural Calculations
for homeowners
(without the faff)

Insured up to £1.5m 

Rapid turnarounds

Money back guaranteed*

Dedicated customer service

Credit / debit cards accepted

ISO 9001 quality certified

IStructE affiliated

*Terms and conditions apply.

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

Maggie, Homeowner

0 +
Projects Since 2012

Calcs-Online: The Scourge of Local Engineers Nationwide

Hear more from our CEO, Sam Dean, about Calcs-Online's mission.

We have a 100% success rate in obtaining building regs approval for our Knock-Through Structural Calculations

How it works...


Upload your architectural drawings using the quote form below


We'll email you a quote usually within 1 working day


Accept the quote terms and conditions using the link that we send


We produce your Knock-Through Structural Calculations

Knock-Through Structural Calculations Quote Form

Knock-Through Structural Calculations
Typical Prices

Mid-Terrace Property

£ 395
  • Standard Service
  • Priority Service +50%

End-Terrace Property

£ 395
  • Standard Service
  • Priority Service +50%

Semi-Detached Property

£ 425
  • Standard Service
  • Priority Service +50%

Detached Property

£ 445
  • Standard Service
  • Priority Service +50%

“Excellent and swift service. They have addressed all our, our architect’s and our builder’s questions in very quick time.”

James Charlesworth, Homeowner