Hello, my name is Jim and I am a qualified lawyer happy to help you today.
Yes you do have a good case to sue for professional negligence.
Before you do this, obtain a report from another surveyor to support your claim. You should instruct a surveyor who can prepare an expert witness report (there are several in the UK who can do this - let me know if you want me to find one for you - I will need your approximate location).
Once you have that report, send the original surveyor company a letter of claim (see template attached which needs to be tailored to your case). You need to give them 14 days to acknowledge the letter followed by 3 months to give you their liability decision. Assuming they deny liability you will then need to issue county court proceedings for your losses. The surveyor's report should outline your losses. You will need the N1 claim form x 3 completed copies with the court fee and send to the County Court Business Centre, PO Box 527, Salford, M5 0BY. The court will then issue the claim for you.
I have uploaded the claim form. The court fee depends on the value of the claim. Page 5 of this link confirms the fee :
If you are on a low income, have low savings or in receipt of benefits then you can ask the court to waive the fee (there is another form for this - let me know if this applies to you and I will send it to you).
I hope this helps - if you can please accept the answer and give me a 5 star rating (the top right of your screen & then click “submit”), I can answer follow up Q&A's at no extra charge and I will be credited for helping you today.