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2 flats back to one house - Stamp Duty

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1 Sep 2025
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Hi all, after some advice - as per the title we are looking to buy a house that is currently 2x two bed flats of similar value it was converted in the 70's from one house and we'd like both buy both flats (for sale buy the same owner) and convert back to one house.

The bit that I am trying to find an up to date answer for is how much Stamp duty would be payable - here's what I (think) I know:

- The rules have recently changed so SDLT can no longer be claimed back

- If I buy the 2 flats as they are in a single transaction I will have to pay SDLT at the higher rate ON BOTH PROPERTIES - this will be an eyewatering £25k extra on the purchase compared to if it was just one property - this would mean that its out of my reach and is dead in the water.

I have found this definition of a Dwelling 'An existing building (or part of a building) that is used or suitable for use as a single dwelling or is in the process of being constructed or adapted for use as such.' and was hoping that if I can get the sellers to start the conversion, by removing the doors to the flats and removing the upstairs kitchen, then I the adaption for use as a single dwelling could apply and SDLT at the lower rate would apply to the whole building?

Is this a long shot? Has anyone else had any experience of this kind of conversion/deconversion?

Thanks!!
 
what you plan to do in the future is irrelevant in my opinion
its the position at exchange off contract as in 2 properties being bought
 
This is the sort of question that your conveyancing solicitor would love to investigate for you (£££).
 
If you don't own a property currently or you are selling one to fund this purchase couldn't you buy 1 flat at a standard stamp duty then just buy the 2nd one a day or so later so you only pay the higher rate on the 2nd property?

Can't see how both would be liable for the second home premium unless these are going to be your 2nd and 3rd properties
 
Surely if there was a legally binding agreement to buy the seller could combine the deeds back to one property before the sale hence a win win for both parties?

I know next to nothing about property law though.
 

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