Great extension and a great touch on the bi folding doors. They can be expensive but worth it in the end when it brings the outdoors indoors. We voted for the white floor image as a the lighter the floor the more illusion you have of space. It would make it very light, airy and spacious looking. We hope you enjoy your new 'room' and make the most of it K Design - Architects

Thank you for your comment. We had to raise the patio with 600mm in order to be flash with the floor level inside of the house. The bottom floor integrated sliding door rail track gives a perfect finish and it is less than an inch high from inside and outside floor level. You can see on the pictures above that the sliding door is floor to ceiling, which allow maximum amount of light going in.

Hi! I recommend that you create a brief for your architect before they do any further designing as they'll be able to design exactly what you want and need but only if you can communicate what that is. You don't really need us to redesign the plan for you if you have an architect working on it already for you. But if you don't communicate your requirements really clearly to your architect (and that does not mean giving them floorplans that you have designed yourself - you don't need to waste your time doing that if you're paying an architect to do that for you) they will not be able to design what you need and want. If your architect doesn't have a briefing process to take you through so they don't go through an iterative design process, which involves you paying a lot for revisions before you get what you want, then you can start with my free checklist to give you an idea of the kind of things you need to consider and information you need to communicate to your architects so they can deign their best for you. You can get it for free here in exchange for your email address: https://www.i-architect.co.uk/dyhvchecklist.html

There are a few super things about your ambition. I agree that you should be better connected with the garden and the total square footage seems small considering the size of the plot. You need to work out your budget and that will dictate what size you can afford to build. For instance- say you have a £500k budget for the whole house you might well allocate £220k for new kitchen/heating/wiring/flooring/ exterior maintenance such as roof and paintwork. Since your plan involves demolishing a patio you will need another and could well be £45k. This means that there is about £235k for the build and with high ceilings you should probably be allocating £3k/metre square. If it were my house I would have two basement bedrooms in the extension and then have the kitchen and other new rooms at the same level as the principal rooms., if they are not then likely the current principal rooms will become unused.