If you were our client, we would first assess which way the house faces in order to understand the direction of the sun and the likely impact on the space in terms of light and heat, plus we would ask what use you intend to place on the new space. It is also the case that with whatever heating - a fully glazed conservatory can seem an inhospitable space in the winter months. Even in the UK heat gain during our short summer is a major consideration and whilst roof blinds can be added - these can spoil the original design intent. A part solid / part glazed roof with fully glazed walls may be the most successful. Attached image of a garden room with a large strategically placed roof light and two fully glazed walls.

Definitely agree with Design7, the added bonus with fibre cement cladding are: - no maintenance (unlike timber weatherboarding or painting render) - insulation can be added between existing render and fibre cement cladding - an almost instant improvement by adding texture to a very flat facade The risk you face by going with a bold colour over the whole rendered front of your house is that being such a flat and (no offence) uninspiring property, you will only make the situation a lot worse. By adding the texture to the first floor, you can then go bold underneath should you wish to. The other option that no one has suggested yet, will depend on the construction of your house (might be concrete blocks rather than brickwork) and if you do have to strip off the render and start again, it might be worth seeing if you have desirable brickwork beneath it. If so you can either acid strip the brickwork to clean it off or paint the bricks. I would suggest stripping the render off the ground floor and either going for a rendering or cladding to the first floor. I can imagine for a contemporary look, off white with grey Windows and doors, or for a softer cottage style go for a pale cream and mushroom/taupe Windows and doors.

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Since there is an acre with this property have you considered a garden room addition with a saniflo type toilet? Could be standalone guest quarters used for other purposes when not in use? It’s just I’ve learned re-jigging existing space is expensive and here I don’t think re-jigging will get you optimal bedrooms so maybe spend money on brand new garden room?