I don't know about an app, I'm afraid, but you could try out some software such as Sketch Up which allows you to 'mock up' a virtual house. Alternatively you could employ the services of a 3D visualiser who could do this for you. A final suggestion would be to print a photograph of your house and overlay with tracing paper, drawing or painting in the elements you wish to try out.

I would completely agree with the comments above! We started a major renovation 6 months ago and got a concept planner / interior designer on board right at the start and it was the best thing we could possibly have done. She helped us work with structural engineers and an architect to get what we needed for the builders, but helped us avoid going down a very expensive route with an architect involving having a full survey (just a scale drawing of the whole house that they wanted before they'd do the drawing of what we needed) Our concept planner / interior designer helped us look at the space and maximise what we had (not get carried away about adding lots of bits as Man About The House mentions above). She provided different options for layouts and flow of how the space would be used and really challenged our thinking (in a very positive way!) She was also an absolute life saver in terms of helping us understand what to do when and in what order with all the different trades- I would never have known how early on in the process you needed a lighting plan, never mind how to create one and in what format to give to an electrician! She saved us large amounts of money by providing lighting plans and carpentry specifications, so we knew exactly what we needed and could give a proper brief to the different trades, rather than changing bits midway through, which is when the budget tends to creep up and out of control. She also got amazing trade discounts and passed them all onto us, which made a big difference to our costs- everything from the kitchen to underfloor heating and right through to doors and lighting! Just worth mentioning that our interior designer was able to offer the concept planning service, including all 3D images and video tours but then in addition all of the advice on colour plans and interior fixtures and fittings. This is quite a personal choice and you may only want the concept planning- for a small extra amount (which we definitely got back through all the trade discounts and accurate specs to give to trades) we chose to take the next step up to interior designer as I wanted to make sure that everything 'pulled together'. I had seen to many super practical schemes that looked just a little bit 'flat' and I wasn't confident I had the skills to pull the whole look together without a bit of help! More than anything we have had someone super knowledgeable and helpful on hand 24/7 (quite literally!) for any and every silly little question or wobble that I had. She's made the whole process enjoyable and taken away a lot of the anxiety and uncertainty of decisions. She's also stopped me making a lot of rookie mistakes :) Just to give you an idea in onr part of the house she's helped us achieve; we started with three separate rooms and have ended up with one large kitchen / diner / pantry. We'd never done anything more than a bit of decorating before and whilst I'm sure we'd have got done without her help, I'm 100% sure it would have cost us a lot more money, it wouldnt have been half as much fun and it definitely wouldn't look how it looks now! Hope it helps! Best wishes, Claire

Hi I am thinking of something similar, would love to see what you went with, thanks

Hi again & thanks for all the advice/opinions so far. We are thinking of all vertical lines with the windows now, mainly because it appears easier on the eye. Hopefully we won’t miss the small openers too much. Downstairs will be sliders for the window & doors. Can anyone help with frame colour? If we stick with the brown brick (which I find dreary/dark tbh & is very marked/damaged) then we’d go with light window frames. My preference would be off white or a similar pale neutral. However, the front windows aren’t being replaced so will stay pure white for now. The soffits & fascias are white. The other half of our semi next door is white. How would this work - would we need to change fascias to a different colour so as to link the white & off white? The other option is to paint or render or clad the rear of the existing house to disguise the old brick. This could possibly allow us to venture into a different colour for the windows & doors at the back, maybe pale olive green or similar. Is this a no no when part of a semi detached building? Should we retain the same look as our other half, even if it is dated? Any advice much appreciated. Really want to brighten the house up but without making it stick out like a sore thumb as it’s semi rural here with a lot of mixed housing stock (mostly character builds). Attaching an attempt at a mock up if that helps…