Nope doesn’t meet the floor space required for planning permission however check with your local authority…

As a general guideline, if there is not already a building on a piece of land, then planning permission will be required to erect any new building on the site. If there is already a building and you wish either to extend it or erect another building on the same site then, in certain circumstances, planning permission may not be required. For example, you may be able to put up a low wall or fence, a garden shed or greenhouse, or a garage, without planning permission. You may also be able to extend your house, but the law relating to house extensions is fairly complex and there are limits on the size of extension allowed as "permitted development". When you ask at the Planning Office whether your proposed extension requires planning permission, they will need to know:

whether the house has already been extended;
the ‘type’ of house; whether it is a flat, terraced, semi-detached or detached.
(Note: extending a flat always requires planning permission);
the size of your garden;
the size of the extension and of any previous extensions;
its position in relation to the existing house and boundaries of any adjoining properties;
its distance from any garage.
References :

no …
You only need a permit for Restoration or building a dwelling in which people reside…. ot the general public has access to !
References :

Neither Planning Permission or Building Regulation approval is required provided that:

Sheds and greenhouses do not cover more than half of the area of the garden; not including the area occupied by the house.
It contains no sleeping accommodation and the floor area does not exceed 15 square metres. .
No point is less than one metre from a boundary.
It is not more than 3m high for a flat roof, or 4m with a ridged roof.
No part projects beyond any wall of the house that faces a road.
The outbuilding is for use only by those who occupy the house.
Building Regulations do state that structures built of combustible material (i.e. a wooden shed) must be at least 2 metres from the main house.
References :
http://www.diydata.com/planning/planregperm/planning_rules.php

I’m not sure what you mean by "building regulations". Most cities have restrictions on the size of a building before it is accepted. Mine requires a building permit for one larger than 100 square feet.

I would check with your municipal building department. You could also check your tax bill statement to see if you are being taxed on it. If you are then I would think you are safe.
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Usually you need a permit.
Check with your town tho
because every county in the states are different.
References :

Here we go again – every time a question like this arises you get mainly twaddle for answers. Grendel got close but still a lot of bull in the answer. No you do not need building regulations approval for a shed but in certain circumstances you may need planning permission. Rare, but it depends on a number of factors – size, siting etc. I don’t normally work for nothing but in this case I will give you free advice to keep you out of trouble. Please contact me via the website below and I will respond to you privately.
References :
http://www.planningandenforcement.com

some areas have covenants on them, like a housing estate, which would expect you to apply for planning consent from your local authorities. Our old house had a whole long list of things you could and couldn’t don, including shaking your door mat outside the front door!!!!
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extravagant log you’ve occupy

I’d come to clinch the deal with you here. Which is not something I usually do! I enjoy reading a post that will make people think. Also, thanks for allowing me to speak my mind!

In Guernsey you need them but we are a mad lot down here. It all depends on your area I guess.