You should not choose a SE based on price only

My wife and I are having a ground floor kitchen extension built on our Victorian mid terrace house in XXX. I have attached the plans and structural calculations. The extension has involved a knock through with steel I-beams installed into the ceiling of the existing ground floor.

After the steel installation and load transfer was completed, I noticed that the bathroom floor (above the existing kitchen) had dropped by about 10-15mm, leaving a gap and causing the shower to leak. I felt unhappy about the work and called my structural engineer and building control. Building control have demanded that a structural report is completed along with a structural plan to rectify. 

We urgently require a survey so that we begin remedial works.  Our current structural engineer is unfortunately unwell so cannot attend. Could you please look at the attached and let me know if you would be able to come out as soon as possible to complete a report.

Our structural reports and designs are all original and prepared one by one by a multidisciplinary team, the price can not be compared to reports prepared by a single person. As it has been published by the Collaborative Reporting for Safer Structures UK (CROSS-UK) plagiarism, corner cutting due to pressure to deliver quickly and cheaply have created a copy and paste culture which is direct result of most structural mishaps nowadays. 

The Building Safety Act 2022 requires that structural compliance must be demonstrated on all buildings, not just high rise buildings as is commonly misunderstood.

The situation in Scotland differs from other parts of UK. It has long been the practice in Scotland that structural modifications and indeed the whole structure need a Chartered Engineer to sign them off. This includes even very modest schemes. This practice is now formalised under the Structural Engineers Registration (SER) Scheme.

This gets proven once construction has been completed.  Any delays during construction can cost the full builder´s crew on site for days, not to mention any mishaps including returned materials, collapses, road closures, crack repairs, deformed roofs....we have witnessed these all. Wrong underpinning design can be added to a register that restricts lending to that property, In some cases the wrong engineering approach can have serious financial consequences. 

Structural engineers will see the developing site and not much more.  This is a good hint to evaluate the services of a prospect structural engineer with a website full of finished buildings images, most likely stock images from the internet.