Over the last couple of years, I've written a few articles on how to setup your garden shed as a workshop. Here's a summary of all the topics you might need to think about when designing your workshop.
Storage and furnitureStorage is one of the key requirements for a workshop, you need to ensure that all your tools and materials are easily accessed. Shelves and peg boards are good for storing items that regularly used, drawers take more effort to create but allow better organisation, cupboards are good for the bigger items. You'll also need to think about a bench to work on and specialist areas such as a hearth if you wish to participate in welding, brazing or heat treatments. A foldable workmate like bench can add flexibility to your arrangements if you use your workshop for different activities.
ShelvingSmall Drill DrawerLarge Storage DrawerSlimline vs full depth drawersWorkshop WorkbenchBuilding a hearthElectricity supplyUnless you've managed to get your workshop powered by a treadle or belts you are going to need an electricity supply. Here's some links to show how to do this safely.
Laying a cable down the gardenSimple ElectricsDetails of Workshop ElectricsSafetyIf you can't work safely then you aren't going to be using your workshop for very long. Here's some thoughts on some of the different safety issues to consider.
Chemical SafetyElectrical SafetyMore Electrical SafetyFire SafetyRepairs and British WeatherOne key issue with the UK is the weather, you can guarantee rain and damp in your shed. Ventilation helps with damp, heating can help but gas or paraffin heaters give out water which can make the damp issue worse. Maintenance of your shed to keep it water proof should not be put off and periodic repainting is a good idea. Remember that plastics can deteriorate in the sun so those on the sunny side may need replacing more often.
Recladding the shedProblems with damp?Rust and Antirust paperSecurityI've not got any specific articles on this but things to consider are: can people see all your expensive tools through the windows, can the windows be easily broken or removed? How big a lock? Too big might encourage thieves, a motion detector attached to a light might discourage casual thieves, are your hinges secure or can the pins be removed easily, do you want to alarm the shed or will it just go off every time the neighbours cat lands on the roof? Do you want to have additional security in the shed such as locking up your ladder? Are there tools in the shed that could help a burglar enter your house?
Does you household and building insurance cover your shed contents or do you need specialist insurance?