Worst thing that the OP could do would be to listen to your post - eg.your £300(?) estimate immediately turning into an £1800 actual cost.
How do you know that a general builder "is not a qualified person to comment on" the kind of work that they do for a living?
And how do you know that the above job is"something outside their expertise"?
I know a contractor whose small firm has done nothing but subsidence work for the last 40 years - he'd be very surprised to know that he doesn't know what he's doing?.
By your line of reasoning most every BCO would be barred from giving opinions on the work carried out on behalf of SE's & RICS's - Why? Because the BCO's typically have only practical experience, & are not "qualified".
How do you know that a general builder "is not a qualified person to comment on" the kind of work that they do for a living?
And how do you know that the above job is"something outside their expertise"?
I know a contractor whose small firm has done nothing but subsidence work for the last 40 years - he'd be very surprised to know that he doesn't know what he's doing?.
By your line of reasoning most every BCO would be barred from giving opinions on the work carried out on behalf of SE's & RICS's - Why? Because the BCO's typically have only practical experience, & are not "qualified".