How to put up a garden shed: easy assembly and installation

Installing a garden shed: regulations and choosing a location

Before starting any construction work, two issues must be clarified: the applicable regulations and the right location. These two factors determine the model chosen, the ground preparation and the practical conditions of the installation.

What administrative procedures are required before installing a garden shed?

To install a garden shed in France, the formalities depend on its floor area. Before assembly, check your local authority’s Local Planning Regulations (PLU): these set out the local rules applicable to the plot, height, boundary lines and, in some cases, the external appearance.

• Less than 5 m²: no administrative formalities are required; installation can go ahead without a declaration.
• Between 5 and 20 m²: a prior declaration of works must be submitted to the town hall before installation.
• Over 20 m²: a planning permission application is required, as is the case for the Vernier model (34.84 m²), which is available as a garden shed.

In addition, some local authorities set limits on maximum height, particularly for flat roofs. Set-backs from property boundaries must also be carefully checked: a distance of 3 metres is often required, 2.5 metres from the gutter and 3.5 metres from the ridge, unless written consent has been obtained from neighbours.

How do you choose the right location for your garden shed?

The location is not simply a matter of finding a spare corner of the garden. In practice, you need to consider accessibility, aspect and the nature of the ground to ensure easy installation and day-to-day use.

Opt for a stable, clean and well-drained area. Flat ground makes it easier to assemble a garden shed, minimises the need for adjustments during construction and ensures the doors open smoothly over time.

Depending on the layout of your garden, the edge of the garden or a corner backing onto the house often creates a harmonious look. Conversely, an area that is too sunken or damp encourages water to rise and makes preparing the site more difficult.

An unobstructed area is easier to maintain and allows plenty of space to manoeuvre tools, a lawnmower or bicycles. Where space permits, leave at least one metre of clear space on each side to manoeuvre the panels during assembly.

A wooden garden shed fits naturally into a green setting. A well-prepared site then makes it easier to add storage units, shelves and equipment useful for everyday life.

Preparing the foundations: with or without a concrete slab

It all starts with proper ground preparation: weeding, removing stones, roots and debris, then checking the level across the entire future base. This stage determines the quality of the entire installation: an uneven surface of just a few centimetres is enough to throw the panels out of alignment and weaken the structure.

Installing a garden shed without a concrete slab: what are the alternatives?

It is still possible to install a garden shed without a concrete slab if the ground is sound, stable and well-drained. Depending on the layout of your space, various support options can provide a reliable base without the need for a full concrete slab, provided you ensure the ground is level and properly aligned before laying the floor.

• Concrete blocks on a bed of sand: buried and spaced approximately 30 cm apart, they promote water drainage whilst providing a firm foundation for the floor and panels.
• Concrete blocks or gravel-filled slabs: laid on a bed of sand and gravel, they provide a durable, clean solution that can be repositioned if necessary.
• Anchor posts on bare ground: holes at the four corners accommodate the posts, which are secured with stones and concrete to create garden shed foundations suitable for unpaved ground.

These solutions are particularly suitable for small or medium-sized structures. Conversely, when installing a larger or heavier shed, a concrete slab remains the standard choice: it improves stability, simplifies anchoring and provides a continuous surface for securing the shed properly.

How do you pour a concrete slab for your garden shed?

To lay the foundations for a garden shed on a concrete slab, you must first excavate the ground to a depth of around 20 cm, marking out the exact footprint precisely with stakes and a string line. Once the area has been cleared, the ground is compacted before the concrete is poured. Allow for a minimum thickness of 10 cm for the concrete slab, and preferably 15 cm if the garden shed is heavy.

It is best for the concrete slab to extend slightly beyond the outer dimensions of the structure: this provides a more stable base and allows the panels to be fitted more neatly. In practice, for your garden, you should also provide for water drainage around the base to prevent any water from pooling under the floor and on the floor of the shed.

Fixing and anchoring depending on the type of support

On a concrete slab, the structure is generally secured using metal brackets or threaded rods bent at right angles, fitted at the four corners and then secured with a metal plate and lock nuts.

On concrete blocks or concrete pedestals, installation requires the same precision: the structure can rest directly on the base or be anchored using brackets connected to the load-bearing perimeter. Habitat et Jardin offers galvanised steel fixing kits suitable for various configurations, to minimise on-site adjustments.

Once installed, checking the level remains essential. The shelter’s floor must be perfectly horizontal, checked with a straightedge and spirit level, before the decking is laid: a deviation of just a few millimetres is enough to complicate assembly, warp the panels and weaken the entire structure. The same principle applies as for site preparation: the quality of the anchoring depends above all on a clean base and well-executed foundations.

Step-by-step guide to assembling a garden shed

Once the foundations are ready, assembly can begin. For a large garden shed, working in pairs significantly speeds up the process: generally allow one day for two people, compared with around three 8-hour days working alone. The difference often lies in handling the panels, which is easier and safer when working in pairs.

Preparing and checking the parts before assembly

Assembling the garden shed begins with thorough preparation. Check each component against the instructions, piece by piece, to ensure that no missing parts halt construction partway through the assembly process.

As for the timber, slight variations in dimensions are possible: spruce shrinks or expands depending on the ambient humidity. So keep your tools close at hand: at the very least a spirit level, set squares and a screwdriver, to ensure you can carry on without interruption.

Assembling the walls, roof structure and roof

Getting the order of the steps right is key. Start by installing the floor, laying the floor frame on the foundations, then check the diagonal braces to ensure everything is square. Any misalignment at this stage will affect the entire structure.

Continue with the walls, starting from a corner. Temporarily secure the panels with props, work round in a clockwise direction and check that they are plumb at each level before fixing them permanently. In addition, reinforce the joints with metal brackets before erecting the roof structure.

The roof is fitted last. On a timber model such as the Vernier, the roof structure rests on 16 mm battens with a 14° pitch, designed to support a snow load of 75 kg/m². Lay the roofing from the bottom up: the waterproofing depends directly on the elements being properly overlapped.

Fitting the shed’s door and windows

The 1.73 × 1.28 m ‘low entry’ double door and the two windows are fitted once the walls are secure. Carefully adjust each frame to ensure smooth opening and a good seal at the joints. This stage requires particular precision: a slightly misaligned frame will compromise the seal at the joints.

The acrylic glass panels are highly impact-resistant. The lock features a child safety mechanism to prevent accidental locking. Then adjust the hinges after fitting to ensure a neat alignment.

Assembling a metal, timber or resin garden shed: the differences

The material really does change the way a garden shed is installed. Making the right choice depends on preparing the ground, the tools you’ll need, the type of panels and how the shed is secured.

Installing a metal garden shed: method and tips

To install a metal garden shed, the first step is simple: lay out all the parts on the ground, check the instructions and ensure the ground is level.

The key differences often lie in safety and the assembly sequence. Gloves are essential, as the edges can be sharp; the walls are then assembled using clips or screws before the roof is fitted. Once the structure is stable, the shed must be secured to a concrete slab or a suitable base using brackets or threaded rods.

Specifics of assembling wooden and resin structures

To install a wooden garden shed, there is an additional step before assembly: treating the interior surfaces, the floor and the roof with an insecticide and fungicide. On a spruce garden shed, two coats of wood stain on the exterior walls enhance durability: the total surface area to be treated can be up to 34.84 m² depending on the model.

Conversely, resin requires less treatment but greater care when siting the shed: the ground must be perfectly stable, dry and level, as the interlocking joints do not cope well with unevenness. To assemble a garden shed made from this material, strictly follow the order set out in the instructions: the panels are designed for precise assembly, without any improvised adjustments.

Finishing touches, protection and maintenance of your garden shed

Once installation is complete, the finishing touches ensure the garden shed’s longevity: the difference often lies in a few specific steps carried out on the panels and the roof. Habitat et Jardin recommends a systematic check of key areas to guarantee another season without intensive maintenance.

Essential finishing touches after assembly

The quality of the seals applied as soon as assembly is complete determines long-term watertightness. Applying a bead of exterior-grade silicone to every joint between panels, around the window and door frames, and at the corners of the roof seals the structure completely. Once installed, check that the hinges are level: fine-tuning prevents stress on the door.

• Silicone sealant: apply continuously between the panels, around the windows and at the roof junctions.
• Metal guttering: should be used wherever space allows. It directs water away from the foundations and facilitates rainwater collection.
• Under-roof ventilation: essential to prevent condensation, especially where the shed is used to store tools or cardboard boxes.
• Screws and fittings: checking that everything is tight ensures the structure remains secure throughout the seasons.

In practice, for your garden, regularly clearing leaves from the roof prevents overloading and the build-up of damp. On a bituminous roof, a gentle sweep with a broom once a year is enough to maintain its waterproofing.

Garden shed maintenance: targeted care depending on the material

Wood, metal and resin each have different maintenance requirements. For a wooden model, two coats of insecticide and fungicide-treated wood stain, applied 24 hours apart, seal the fibres. Light sanding before each new application allows the wood grain to breathe whilst repelling water. This treatment should be repeated every two years.

Conversely, a resin shed simply needs a jet wash, without an abrasive brush. On metal, a gentle wash followed by a light polish minimises tarnishing: any scratches must be touched up immediately to prevent corrosion from setting in.

Whatever the material, lubricate hinges and locks, check that the doors are level, and clean the acrylic panes with mild soap. As with the choice of structure, carrying out these checks regularly extends the shelter’s lifespan and minimises the need for major repairs.