The £7k - is that to come out of the pot, or dealt with separately?
If it's from the pot, this is my calculation :
House sale £710,000
minus £155,000 to repay mortgage
Leaves £555,000 to be distributed
Of that :
You are owed £152,000 that you put in to the house in the first place (£327k-£175k)
Plus £100,000 renovations
= £252,000
He is owed £27000 renovations
Plus £7000
= £34,000
So, £555,000 minus £252,000 and £34,000 to him, leaves £269,000 profit in the pot.
70% = £188,300 You
30% = £80,700 Him
So you get £252,000 + £188,300 = £440,300
He gets £34,000 + £80,700 = £114,700
Doesn't look very fair.