The property had a loft conversion done just after we bought it in June 2009, ( it was not our main home then ) and that must have taken 6 months before we rented it out, The cost of the loft conversion was £40k.
We moved back into the property in June 2013 for six months when we wanted to sell it, but we found it had subsidence and could not sell, a local developer has offered us £905K to sell it, and together with the other seven owners of the site we have agreed to sell to the developer, subject to planning permission approval from the local council.
So to answer your question :-
It was our main home for only six months.
The value of the property is £905k and the Option to Buy is about to be signed by all eight owners of the site, the local council could take up to eight months to give approval, so if all goes well we would hope to get the money about March 2016.when we exchange contracts.
This would be a simple sale and nothing about a cut of the sell on profit.
The tenants are due to vacate the property on the 30th October 2015 and we would need to get our 90 days occupancy in the property, taking us up to the end of January 2016, as you can see the timing is tight.
And the original question is how much CGT will we pay if we don't occupy for the 90 days, and we sell for £905K.
Best Regards Bob.