Yes. Does it have to be written down on many pages of A4 to a set format? Certainly not. Does it have to be carried out by an expensive consultant? No again. Can he do it himself? Yes, almost certainly by looking around, identifying any sources of ignition, doing whatever he can (reasonably do) to remove these and then deciding if he needs to do anything else to reduce the risk.

Thanks, all done now.

The OP referred to the use of a lock up garage for storing low risk builders materials and tools. I would say any Builder could do a reasonable job at such a low risk simple premises. I am not sure why you think Builders are so thick Bob, some can even write and use a knife & fork :)

again with all due respect I do not say that builders are thick I say that undertaking a suitable and sufficient [note the term = suitable and sufficient] risk assessment takes skill, effort, knowledge, understanding etc. e.g. competence and like others I have found that some [few] small builders are great and some large business are very poor and we should all concentrate on what we are competent at e.g. builders build and risk assessors facilitate my point is that if a small builder wants their accounts, roofing work, electrical work, national insurance, pensions etc. doing they get the right people in to do it for them so why should they not get H&S in as well? And if we continually say that risk assessment is easy [without the appropriate competence behind you] we may as well throw in the towel - I say best of luck to all competent builders and that they should stay in their competence zone

if a 1 man band kills, maims or otherwise really hurts somebody because of their actions/inaction then they are at the mercy of the court etc. and all the goverments marketing and politics about helping small business goes out of the window & the single trader stands alone - the same with tax & all other things as for expensive I do not buy it as a gas fitter, electrician, mechanic, plasterer, accountant, solicitor etc. that are used by 1 man bands usually charge more and are happily paid by these same 1 man bands I support one man bands [I was an SC60 tradesperson & I ran a limited company] all I am saying is that we should all stick to our own competences & if a one man band is in doubt then they should get themselves on a proper course as they willingly do for other aspects of their job best of luck to him & U -- sorry about the spelling in the last post?!

At the end of the day, it is a lock up, described as being without hazardous materials. In this case a no brainer but Bob's point may well be valid in other circumstances.