Thank you. Very good advice. Not spoken to either contractor yet but I was thinking of going down the negotiation route.Really depends on who the cheaper firm is. If they are a good firm then 5% is a significant saving, if they arent then it will cost you a lot more than 5% in the long run. If nothing else the 2nd quote confirms that your 1st quote was reasonable. Maybe worth asking if your preferred firm will match the cheaper quote or even meet you half way? They will have a lot more margin than the 5% built into their quote already.