What you need to know before installing a greenhouse: from permits to foundations

Applying for a permit for your greenhouse

In most cases, you do not need to apply for a permit for a greenhouse. Sometimes, a notification of the installation of your greenhouse is sufficient. The regulations for this depend on the location and situation in which the greenhouse is built.

If you already have a garage, garden shed, or other outbuilding, your obligations may differ from those of someone without outbuildings.

Therefore, inquire with your local authority before purchasing your greenhouse. They will inform you which rules apply to your place of residence.

Ensuring a solid foundation for your greenhouse

A solid foundation is important for anchoring a greenhouse during strong winds. You do not need to do much preparatory work for the foundation. The only thing you need to do is ensure that the ground where the greenhouse will be placed is flat, free of obstacles, and level.

However, if your garden has a significant slope or an unstable soil situation, it is recommended to provide a concrete, frost-free plinth to guarantee the stability of the greenhouse.

All our greenhouses are equipped with an aluminium foundation beam as standard, so you do not need a concrete plinth. This beam has an anchor point in the ground at each corner. We do recommend pouring a small amount of concrete around the ground anchors after the greenhouse has been assembled.

Preparing for the delivery of materials

When you are going to install a greenhouse, it is important to manage the delivery of the greenhouse and materials effectively. These are a few things you should consider:

The materials are delivered in large packages, so please provide sufficient space.

The packages are unloaded on a driveway or at the roadside.

In the case of roadside delivery, you must report this to your local municipality.

Leave at least 80 cm of free space around the greenhouse for its installation.

What warranties do I have?

You benefit from the following warranty periods:

10 years on the quality and alloy of the aluminium
10 years on the paint finish (powder coating) in case of delamination, peeling, flaking, corrosion, chalking, discolouration and loss of gloss where the pre-defined tolerances are exceeded, in accordance with the Qualicoat or Qualinod specifications
10 years on the adhesion and tension of the glazing rubbers
10 years on production defects in the glass
5 years on PVC components and their UV resistance

The following damage is not covered by the warranty:

Damage caused by failure to follow the installation and operating instructions
Damage resulting from use other than the intended normal use
Damage due to lack of maintenance
Normal wear and tear
Materials and items used at the customer’s specific request
Structures not part of the Janssens range but manufactured at the express request of the customer or distributor

Our greenhouses are intended for growing vegetables, fruit, flowers, etc. The following characteristics are inherent and vary depending on the situation, environment and use:

Condensation on glass or profiles
Draughts at doors, windows or gaps
Roof windows, roof connections and gutters are not 100% watertight
No waterproof barrier beneath the foundation frame

Do I need planning permission to install a Janssens greenhouse?

Regulations regarding the installation of greenhouses and outbuildings vary by region. Always check with your local planning authority before purchasing a greenhouse.

What you need to know before installing a greenhouse: from permits to foundations

Applying for a permit for your greenhouse

Ensuring a solid foundation for your greenhouse

Preparing for the delivery of materials

Advice on installing a greenhouse

Frequently Asked Questions

Do you have any questions?

Webmaster Janssens

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