Hi Alex, thank you, your reply 'almost' clarifies things.
Can you specifically confirm that the 'estimate', which indeed matches the 'invoice', has no special legal standing and does not entitle them to demand more money?
There was no additional work (hidden pipes, etc) and, in any case, that is not what they are claiming extra payment for.
They specifically claim that they got their maths wrong by the 'cost of the laminate flooring' [sic].
Based on your advice I am planning on contacting them to say that:
1: the original estimate, which we agreed, and the corresponding final invoice, which matches the estimate, are not in dispute and we are happy to pay it now that the works have been completed.
2: The additional monies they are seeking, because they got their maths wrong, are disputed, and we refuse to accept the additional charge.
3: Their repeated reference to their 'estimate' (rather than a 'quote') does not give them ANY special protection or rights in the eyes of the law.
4: The only stated potential variable that could have affected the estimate was the work required in the kitchen (this was verbal) which, i the final event, did not change. There was no extra charge.
5: Although the original estimate/invoice is not in dispute, I will want a letter from them confirming that my payment will be in full and final settlement before I pay.
Do you agree/disagree with any of the points above, especially point 3?
Finally, can you confirm that you are a UK based solicitor plase?