How To Build A Garage

Rules concerning outbuildings apply to sheds, greenhouses and garages, so before starting with a garage it is always a good idea to check with the local authority’s planning team that you can build one. Many garages in the UK are brick built although it is perfectly possible to make a timber one, too. Temporary structures, such as car ports, tend to come under different regulations, but it is still worth checking because the last thing you want to do is to construct a car storage building of any kind only to be forced to pull it down.


Like any building, a garage requires firm foundations so that it does not shift around under its own weight. This means digging into the ground a couple of feet around the garage’s dimensions. Of course, marking out where the walls of the garage will go before hand helps to keep the foundations in the right place. Mark this out with pegs and string. About 12 feet by 20 feet is the right sort of size for a standard single garage. Check that your ‘walls’ are at 90 degrees to one another. Dig out the foundations by hand or with a mini-digger and pour concrete in to make a firm base.

Wall Construction

Laying breeze blocks is perfectly adequate for the walls of a garage. In some cases, they just don’t look next to a brick built house, so walling with bricks is advisable. Bricklaying with mortar is a skilled job, but if you have done it before there is no reason not to take on the wall of a garage for yourself. Leave room for the garage door, of course. Garage doors vary in size and are generally sold at around the two metres mark, so ensure the hole left is slightly in excess of the one you will use. If the garage is to serve as a workspace as well as a garage store, it is worth making it double skinned. That is, with a breeze block inner wall with a brick built outer shell with a cavity in between. This will make it a lot warmer in the winter.

Roof And Floor Construction

For the floor of a garage a simple concrete pour will be enough to make a base. Tip some rubble over the floor area before pouring concrete to create some hardcore. Skim the concrete pour to get a neat, flat look which will make for an ideal garage floor. For the roof, it is possible to make a pitched roof with a timber A-frame to support purlins and roof tiles. However, in most cases this is excessive for a garage. Simple corrugated roofing panels can be laid over the top and they work very well in all sorts of weather conditions. Flat roofs are also popular with garages, nowadays. If you opt for a flat roof, then water run off can be an issue. The best way of ensuring that a flat roof remains water proof is to install something like an EPDM membrane over the top. This synthetic material is very long lasting even if it will be exposed to lots of sunlight in the summer and frost in the winter.