I'm not a lawyer, this is not legal advice, get a law club they are like £7 a month and call one of them.
Tell him that you no longer wish to have the extension built and that you are sorry for the inconvenience but will no longer be requiring his services.
Good call.
Also state that you understand that materials are subject to a cursary 5% restocking charge and that you are willing to pay for this (direct to the builders yard), once proof of such a transaction has taken place.
He has violated his agreement with you and has no right to the restocking charge a judge will not award it to him unless he can convince the judge he has complied with his verbal contract obligations as it's an unfair penalty clause. (And, you can appeal this sort of thing too, it's cheap to do)
Why did you engage the services of a builder who has given no written quote?
I've done it many times successfully (and occasionally not so successfully, but not worth spoiling the friendship over) but you have to know the tradesman personally otherwise make him write it on paper.
He became under employment yesterday, in 2 days the price changed
Then he said he was a registered installer and when I checked he was not
We were naive and wanted it done fast
This used to be a specific offence under the 1978 Theft act of obtaining a pernicious advantage by deception. as he did this to obtain remuneration. This law was repealed by the Fraud Act 2006 and I think will now be harder to prove so you should speak to your law club (or phone up local lawyers with a sob story).
Either way he is voiding his contract unless you allowed you to vary price. and almost certainly voiding it with something under the Fraud Act 2006 by lying about his credentials. You need to join a law club
Not to mention, I don't remember you saying that was OK to vary Your word against his right? And it doesn't matter this smells like unenforceable contract to me.
If he did that, might "he" be breaking the law ?? ,, (dumping, causing an obstructuon)??
He can put what he likes on your private ground it isn't fly-tipping. If he put it in the ROAD or PAVEMENT outside your home however now he is being a criminal.
However if you can prove it was to harass you then this is a criminal offence.
Judges are sensible people and this guy is a cowboy, tell him you want the job terminated or you will apply to the county court to have his assets frozen until the case is heard (neglect to mention this freezing is for 1 day only) and we can let a Judge decide if his contract is enforceable.