It's an established fact that the human population is getting taller over the year by natural evolution. This has been happening for the last 140 years, prior to that there were cycles in height which were determined by the economic situation and the success of agricultural crops etc. Apparently in the Middle Ages the human race was relatively tall due to the lower population and the adequate food supplies.
From a low point in the 17th century growth has increased, slowly, and with the industrial age coming, helping the production of food, there has been a steady growth in height. This has been helped over the last 100 years of so by the advance in medical science and the generally better diets available to us. We has as a race are about 2" taller than we would have been 100 years ago. This is proven by written records and examination of skeletons.
Garden sheds as an industry is quite young in the great scheme of things, with very few firms being older than about 40-50 years. In fact many companies boasting of a long history are NOT the original company but a reincarnation of the firm after the original company closing down or after going into liquidation. However, the height of the doors on many of the larger budget companies still think they are making sheds for people from 150 years ago as the door height is sometimes only 5ft. Either that or their designers have spent too long watching Gulliver Travels. If you are vertically challenged then these will be fine failing that you could invest in a crash helmet to help prevent your forehead having an argument with the top of the door.
Ideally the doors should be at least the average height of the targeted market, which tends to be male and middle aged. According to Wikipedia the average middle aged male in the UK is 5ft 9in (1.753m) so this should be the target height. So any sheds designed (using this terms loosely) should be in that region, any less then the building is made down to a price and NOT to a suitable standard.
All the garden sheds which 1st Choice Leisure Buildings supplies are 5ft 8in (1.73m) or over (most are 5ft 10in) so the need to stoop as you enter your domain is greatly reduced. Ideally a few more inches would be even better but there always need to be a certain compromise on the overall design but the garden sheds should always be made to a quality standard and NOT down to a price. When you take into account the sturdy bracing on the doors, which give superb strength against drooping, which the cheap sheds don't have you can be confident that the shed doors will last the test of time.
Another feature on 1st Choice's doors are the sturdy padbolts on our less expensive sheds, to the shed doors with handle and key lock right up to the Barn like doors on our heavy duty Barnham garden Workshops. Check out what you get on the cheap sheds, normally a turnbuckle, which is a piece of 2 inch metal with a hole in the middle. This is screwed to the door frame to stop the door opening, no security at all.
Also a feature on all 1st Choice's range of buildings are three (3) hinges on each door which is essential to help reduce the loading on the shed door as it opens and closes. Take a look at the cheap sheds makers where you will find only two (2). Reason for this - to cut costs - and to build a shed down to a price.
So three things to check are the height of the shed, the locking arrangements of the shed and the number of hinges. All three are vitally important in a good garden shed, so buy a shed based on good value not DOWN to a price. Also 1st Choice erects all their wooden sheds free of charge to save you the hassle - so just put your feet and read about Gullivers Travels on your Kindle.