Knock down detached garage to build a self contained annex

mrsmsebastian

I have a detached garage in my property that I want to knock down and convert it to something more useful for us. 
I am planning to have a self-contained cabin with a storage room at the back. I included photo and the measurement of the current concrete foundation of the garage where I'd like the cabin to give you an idea, as well as photo of the cabin which needs a little adjustment to accomodate storage as well as photo of the current garage.
My question is Do I need planning permission, building regs and can I just use the existing concrete base for the cabin?
Your help will be appreciated 

DB1904

mrsmsebastian said:

I have a detached garage in my property that I want to knock down and convert it to something more useful for us. 
I am planning to have a self-contained cabin with a storage room at the back. I included photo and the measurement of the current concrete foundation of the garage where I'd like the cabin to give you an idea, as well as photo of the cabin which needs a little adjustment to accomodate storage as well as photo of the current garage.
My question is Do I need planning permission, building regs and can I just use the existing concrete base for the cabin?
Your help will be appreciated 

Given you're building self contained living you'll need both planning and building regs.

 

Doozergirl

Yes, you absolutely need planning permission and building regulations.  Many different elements to comply with because it is habitable space.  You might better off converting what you have as it seems a bit of a waste. 

First of all, try drawing that layout to scale.  It won't work.  

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mrsmsebastian

Doozergirl said:

Yes, you absolutely need planning permission and building regulations.  Many different elements to comply with because it is habitable space.  You might better off converting what you have as it seems a bit of a waste. 

First of all, try drawing that layout to scale.  It won't work.  

Silverline 731001 Aluminium Scale Tri Rule 300 mm https://www.amazon.co.uk/dp/B002QRSPDY/ref=cm_sw_r_cp_api_glt_i_DSQMECTVFFW5PN0RV7ZJ?_encoding=UTF8&psc=1

What do you mean by the below comment please? Does it mean you agree with my idea of converting it into cabin? 

"You might better off converting what you have as it seems a bit of a waste".

And I dont know what this means (sorry English is not my first language)

"First of all, try drawing that layout to scale.  It won't work".

Doozergirl

To 'convert' something is to use the existing building and upgrade it, not knock it down and replace it.  

Your drawing is not 'to scale'.  In the real world, what you have drawn will not fit into the room.  You need to draw a proper plan, not an idea that doesn't fit.  

mrsmsebastian

The walls of the garage seems not very solid, it's almost like a slab put on top of each other. I took a picture of it. So im not sure if it can be converted the way I want it

FreeBear

Your average up * over garage door is roughly 2.1m wide and 2.1m high - It looks like you might have something a bit narrower (maybe 2m). For a practical habitable space, you need a floor to ceiling height of around 2.4m - You are not going to achieve this once sufficient insulation has been incorporated. The same problem applies to the width - There is no way you are going to get a 2.6m wide room out of a structure that is only 2.1m in width.

Simply put, it needs demolishing (including the base), proper foundations put in along with well insulated walls & roof. You will need planning permission from start to finish. You could use a prefabricated shed cabin, but it will need planning & building control sign off if you are thinking of having it as self contained unit. In addition, it would be subject to its own council tax banding.

mrsmsebastian

FreeBear said:

Your average up * over garage door is roughly 2.1m wide and 2.1m high - It looks like you might have something a bit narrower (maybe 2m). For a practical habitable space, you need a floor to ceiling height of around 2.4m - You are not going to achieve this once sufficient insulation has been incorporated. The same problem applies to the width - There is no way you are going to get a 2.6m wide room out of a structure that is only 2.1m in width.

Simply put, it needs demolishing (including the base), proper foundations put in along with well insulated walls & roof. You will need planning permission from start to finish. You could use a prefabricated shed cabin, but it will need planning & building control sign off if you are thinking of having it as self contained unit. In addition, it would be subject to its own council tax banding.

Why can't I use the existing base, I dont see any cracks to it and seems quite thick. I will only go for a self-contained cabin. And if I build the cabin I want, will that annex put off lenders if I remortgage 10 years from now as I heard they dont like annex?

FreeBear

mrsmsebastian said: Why can't I use the existing base, I dont see any cracks to it and seems quite thick. I will only go for a self-contained cabin.

If the slab is large enough, no reason why you couldn't put a cabin on it. Comments about planning, building regs, and council tax still stand if this is going to be self contained - Even if it isn't a self contained unit, any electrical work needs to be certified, and a connection to the foul sewer for the toilet will need building regulation approval.

As for the opinions of a mortgage lender, you will need to talk to them directly. Some may be happy, others, possibly not.

Section62

mrsmsebastian said:

FreeBear said:

Your average up * over garage door is roughly 2.1m wide and 2.1m high - It looks like you might have something a bit narrower (maybe 2m). For a practical habitable space, you need a floor to ceiling height of around 2.4m - You are not going to achieve this once sufficient insulation has been incorporated. The same problem applies to the width - There is no way you are going to get a 2.6m wide room out of a structure that is only 2.1m in width.

Simply put, it needs demolishing (including the base), proper foundations put in along with well insulated walls & roof. You will need planning permission from start to finish. You could use a prefabricated shed cabin, but it will need planning & building control sign off if you are thinking of having it as self contained unit. In addition, it would be subject to its own council tax banding.

Why can't I use the existing base, I dont see any cracks to it and seems quite thick. I will only go for a self-contained cabin. And if I build the cabin I want, will that annex put off lenders if I remortgage 10 years from now as I heard they dont like annex?

You'll need to build what you can get planning consent for, and in compliance with building regs.  It is unlikely the base for a 30+ year old pre-fab garage will be adequate for a habitable building.

How a lender will view the situation depends on exactly what you build, and whether or not it complies with recognised standards and is being used lawfully.

mrsmsebastian

FreeBear said:

mrsmsebastian said: Why can't I use the existing base, I dont see any cracks to it and seems quite thick. I will only go for a self-contained cabin.

If the slab is large enough, no reason why you couldn't put a cabin on it. Comments about planning, building regs, and council tax still stand if this is going to be self contained - Even if it isn't a self contained unit, any electrical work needs to be certified, and a connection to the foul sewer for the toilet will need building regulation approval.

As for the opinions of a mortgage lender, you will need to talk to them directly. Some may be happy, others, possibly not.

Do I need to approach the builder first, are they going to supply the drawings needed to obtain for PP and BR?
Or Do I need to pay for an architect to draw the cabin first then builder to build it? 
Sorry for being stupid