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http://www.butlerhegartyarchitects.co.uk/news/turner-society-newsletter-turners-house-twickenham-0
(not secure link btw)It seems from the restorers that this is a bit of a mystery. The bricked up windows were different brickwork and mortar from the main facade apparently, but don't fit with the interior layout. Turner's own sketches don't seem to correlate with it either.
TLDR: nobody seems to know for sure!
Old tag. Sandycombe Lodge, Twickenham. Home to JMW Turner.
New tag, colourful equine artistry...