If I assume an original 1970 chimney with retro roof pitch, then the windows are retro too. If I assume the roof pitch is old, then the chimney indicates a rebuild. Either way, weird.
The steep roof pitch matches a thatched roof – but a thatched roof would be incompatible with the shallow extensions.
It’s extraordinarily ugly is what it is.
Looking at the high ridge on the end wall of the house, could it once have been a thatched roof, but the thatch was removed by a previous owner for some reason?
To my untrained eye, it looks exactly like most of the A-frame vacation homes in the lakefront community in NC where my parents had their second home in the 1970’s.
I believe it was a really popular architectural trend at around that time.
That was my first impression, but it grew on me
Now I’m back home and I have a proper fast internet connection, I have been able to research it more and it looks as though I was way off on the build date. It’s actually really interesting.
First though, my rationale for thinking this was a 1970 build:
The site is part of the grounds of an old stately home named Brundall House (Brundall is the name of the village) - there’s some information here and here about that./
Brundall house was built around 1815, and was acquired by the military for use as a hospital in WW1, then a training centre until after WW2. it was demolished in 1969 and the entire site including grounds and gardens were developed into a housing estate.
That, together with the presence of a modern garage, and matching windows on both garage and house, led me to assume it was built after demolition of Brundall House, albeit with some anachronistic features such as the gable walls.
HOWEVER!
I looked on this old map (dated 1882) and there is a house in this exact location - I overlaid that map on top of Google’s current aerial view (as best I could - it wouldn’t quite align - possibly for reasons of projection or inaccuracy one map or the other) - here’s what that looks like.
What’s really interesting is that circular driveway appears to be an original 1880s feature!
(NB: Brundall House itself is only named on the above map, not drawn, but it does appear on this one, and the plan view does match the photo of Brundall House at the bottom of this page)
And of course it all makes sense - the house is named ‘South Lodge’ - so this was one of the lodge houses (gatekeeper’s houses) for the Brundal House Manor
Zipping through those old maps, on the 1957 map, this house is mislabelled ‘Brundall House’, and the garage is not there.
On the 1972 map, it’s correctly labelled ‘South Lodge’, and it has the garage now.
So at some point, either when the garage was built c1970, or since, the windows have been replaced (they are not modern UPVC though - they look like late 20th century single glazed metal frame windows to me)
This is so interesting! I love this kind of building detective work! Keep going. I’m enthralled. 
Your odd house was probably built on the foundation (and maybe some of the walls) of the older building.
I think this probably is the original South Lodge from the 19th century - the roof might have been retiled at some point in the 20th century - just googling ‘manor lodge’ and things like that brought me loads of images of different houses, but many of them with similar features, especially the internal gutters and gable walls that extend above the roof line.
One more interesting thing - I was walking near this location and I found copious quantities of (what I thought to be) wild redcurrants growing in hedgerows and wood edges on a path adjacent to where the old grounds would have been - I thought these were just wild, but it turns out that after WW2, the grounds of Brundall house were turned over to fruit cultivation to create local employment - and the place was known as ‘berryfields’ (the housing development subsequently built here now bears that same name). I’m fairly sure the redcurrants I picked in the hedges will be the descendants of escapes from cultivation on the former berryfields fruit farm.
A thatched roof would extend out and droop over the ends. So the top of the ridge would be unfinished.
Thatched roofs are much more expensive to maintain (and there is a fire risk), so it’s absolutely possible that the building could have been derelict and completely roofless before being rebuilt. Even in 1970 I don’t think they would have got permission to replace an existing thatched roof by any means short of enough arson to destroy the structure as well as the roof.
I lean to the belief that it’s just an ugly 1970 building with retro features like the steep roof and the window panes because somebody wanted a 1570 building at 1970 price.
For reference - here’s a property of probably similar vintage (also a lodge from some stately home - also called ‘South Lodge’), with some similar design features, only a few miles away from the one we’ve been looking at:
That’s delightful! I trust you will live up to your username and enjoy them.