Front of house opinions please - phot attached

[Snowglobes]

is this nice or awful? Too much going on? Slate roof, cream wall, green door and solid oak porch. And what to do?

Ahh good, sincere apologies for my mistake, they are in the style of Crittall windows which have slender frames, however often when they are replaced in timber, upvc or aluminium the profile is generally a bit fat for the style.
I think for me the house has lots of upgrades (all for good reasons) but they have been thought of individually rather than as a whole facade so the proportions and colours, which are fine as individual elements just don't quite go together.

I think you are thinking the right way, and you need to simplify the whole thing and work on making what you've got work. Simplifying and making the colour palette more neutral would help to tie those elements together. Adding some bold pops of planting across the front would make it feel more like one building and then working on the proportion of the front door rather than drastically altering the porch.

Personally if I was doing it I might even consider painting those windows black on the outside to tie it all together that bit more.
Go with the style and age of the building.

Is the oak raw? If so, you can accellerate the natural weathering and greying process (in just a day!) by creating a solution of iron in vinegar (iron oxide) i.e. steel wool or a (soap removed) brillo pad and white household vinegar. Leave the wire wool and vinegar solution overnight, and then apply with a brush. Starts working within 10 mins or so, more coats makes it grey even more so leave it to dry in between coats to check you like the colour.

PLEASE DO A TESTER ON INCONSPICUOUS PIECE OF WOOD TO CHECK YOU LIKE THE EFFECT.

I've done this very successfully on oak weatherboarding. I don't know if it will work if the oak has been stained/preserved (yours looks a bit more organgy than I would expect). Might need to sand it first?

There is loads of information available on the web, search for 'ebonising wood' or 'steel vinegar wood'

I think if you could change the roof on the porch to match the roof above it would tie it in better. The middle rendering would be better white, and a wisteria would pull it all together

And changing the roof of the porch would also tie it to the bay window better.

I think it’s the style of roof on the porch, it’s too out of step with the originals. You could do lots of changes( my top one would be paint the rendered section white), but the style of porch roof is the key.
Depending on your reasons for change, I’d be tempted to grow a wisteria up the porch and rendered part and leave it at that.

If you look at the pictures of Frogmore Cottage that the Sussexes have moved into, the house is not that different in terms of concept - lots and lots of wings so to speak, although the scale is obviously different.

It is painted ivory throughout, even on the brick bits, and it really pulls it together. I note they also have a wisteria which I think looks amazing on almost every house.

Frogmore Cottage

I also thought the windows were uPVC tbh - the porch looks odd because there is no other wood like it in vision. It does look too large for the rendered part of the house, it covers the door and two windows.

The rendering is quite a yellow-based cream, if that goes a bit paler the wood may blend in a bit more - it's quite a contrast at the moment.

Is there a reason you went for a green door, rather than a wooden one to match the porch (or a door to match the windows?). I'm no style expert though!

I think this is also a good look also inspired by the Royals

You’ve all had some good ideas and helped me work out what’s wrong. I knew it wasn’t cohesive, hence posting on here and needed help to work out how to improve the aesthetics.
You’ll all be delighted to know that I’m getting in quotes to redo the porch most probably to match the bay with a hipped roof. The size will need to remain due to the side windows.
I’ll probably replace the green door at some stage but I’m still inning & ahhing about that. Maybe I’ll decide once the porch is done.
I hate the white window frames. They’re too bright for me. I think that’s why they look upvc. So I’ll probably paint those albeit not sure if they should be green though as per some suggestions.
There’ll be tons of foliage, pots etc once I work out the structural stuff. No point growing wisteria (love it!) up the porch if I’m going to pull it down. But defo planting!
I need to think about changing the sand colour too. If the porch comes down it’ll need render patches and repainting anyway!

You could keep the white window frames, but paint the surround (I'm sure there's a name for it) in a darker colour to provide a bit of contrast.

No the window frames don’t have a second frame around them.

If you're addressing the issues with the porch (although personally I don't think this is the real issue) and you don't like the white windows then the whole thing could become much more cohesive.

paint the window frames a soft french grey/sage green to match the door.
paint the middle rendered section and the face of the side sections ivory - you can leave the other faces of the house if cost is an issue (if you paint onto the brick this won't be as much as you think - although rendering it would of course be better and in the long run less expensive if you use the coloured render since it won't need repainting every 4-5 years)
soften with planting

The oak porch then won't be an issue IMO.

Exterior renovations are expensive and take time but make a massive difference once completed.

Its a great size though OP and I reckon it'll be a knockout once you're done.

the brick supports on the porch sort of look wrong- it feels like there should be a wall between them and the actual house- to make it a porch rather than just a roof

I think if you joined the brick supports to the house, painted them to match and planted at the side of them, it would tie in well

Just bucking the trend here and saying that whilst it’s not perfect it’s not that bad. I think you just need to paint the front render white so the window frames don’t stand out so much although there are houses where I live with the same green frames to match the door and they look great too. I think that with tons of greenery right along the front of the house will tie it all together nicely, it’s just a bit bare at the moment. You can’t change the fact that the porch isn’t central but it’s lovely in itself and certainly doesn’t need replacing and if the render is white the oak won’t look so brown.

For me the shape of the roof is the main offender, then the round bases of the oak supports, which is out of keeping with all the angles and the oak shouldn’t have been stained, it should just be left to weather. The roof would look much better if it matched the bay window.

I’d also paint the render and add small return walls either side of the porch

Also bucking trend.
It might look odd, but it’s a fully functioning porch, right?

I personally would feel uncomfortable using building materials and money to fix something just because it looks a bit odd. If it’s leaking/ damp, or actually dysfunctional, that’s one thing, but just because it looks out of keeping?

Use plants to help the elements blend, and spend the money on something else.