We have a similar problem in that we really don't like our brickwork in our 1980 built home and have the dark brown window frames. Some people just can't understand why we dislike the bricks and I thought they may grow on me. After 4 years I still can't stand them and can't wait until we can afford to render. If we had a small area like yours I would have got it done long ago. Ours is huge. Don't be tempted to bag the walls. I've seen some shockers, usually people trying to do a cheap 'flip'. As for the windows, my uncle who is a painter & decorator said that as long as the frames are cleaned well they are OK to paint conventionally. The channels will be tricky, but ours need new felts etc. anyway.

guess you would have completed the update by now but just in case, They built great houses in the 70"s, a lot had concrete tiled roofs, have them checked and if sound paint them grey along with gutter and barge boards as you suggested but please do a soft grey otherwise it will look too top heavy, down pipes same colour as bricks (photo of soft grey roof) Paint garage doors same as brick colour minus the stripe, Front entrance update would help, does this open into a small foyer Railing, windows painted, I prefer black for this, I have attached a photo of a house that the owners had the roof painted, they painted all the metal windows themselves, said it was easy. Paving in front of entrance, this photo shows they used white pebbles and pavers with a small screen, plus a new hedge. similar entrance doors to these let in much needed light as these houses can be quite dark

The detail on the fence should pick up the detail on the house. As it is at present there are no elements of the fence which relate to the house in any way. The piers are also different. It also appears that the wall is single brick. If you paint the fence without waterproof sealing the back of the wall the paint will peal or flake off. The paint even flakes with unsealed double brick as moisture gradually works its way into the bricks. Before doing anything, work out whether the cost of finishing the wall and fence and painting is worth it as the fence will still look alien to the house. However, if it's within your current budget I agree that a simple flat top picket fence would look better with this house with piers only at the gateways. I would also consider removing the concrete directly in front of the fence. Originally it was grass or planted as the two neighbours' verges appear to be. Plant the verge with a low hedge to soften the bulk of the fence, particularly if it's staying as is. Prune the lower suckers or branches of the tree to allow clear access on the footpath.

There is a company that matches the existing and paints the new brick. Quite expensive apparently but can't pick new from old so could end up being not to bad. Rendering and painting adds up quickly so really isn't the cheap compromise many believe. Could use a completely different brick which has been done as well, selective cladding, etc.. You could reuse some existing bricks if they're being removed to allow the new works. Many builders and bricky's don't like the labour of cleaning bricks so it could be worthwhile doing it yourself or hiring in a labourer to do it for you. Note that some bricks can't be cleaned due to the mortar used so check it first.