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In depth

Garage extension: what is involved?

A garage extension is a garage built directly against the house, usually at the side or rear.

  • One fixed contact, from idea to completion
  • Drawings, permit and construction
  • Large network of skilled tradespeople
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The bare flat roof before the work in Amsterdam The same roof after completion: roof extension with a timber roof terrace BeforeAfter
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The short answer

A garage extension is a garage built directly against the house, usually at the side or rear. It stands on its own foundations and often has a flat roof and an up-and-over or sectional door. For a simple, uninsulated garage of about 3 by 6 metres, roughly allow €20,000 to €40,000 including VAT; insulated and with a connecting door to the house, it is more. At the side, an environmental permit is often required. A tailored quote follows a conversation.

Do you need a permit for a garage extension?

That depends mainly on the location. An outbuilding in the rear garden area can be permit-free, within the rules on floor area and height. If the garage is at the side close to the front facade or next to a public road, an environmental permit (omgevingsvergunning) is usually needed. Your municipality's environmental plan can also set requirements for size, position and appearance. Check via the Omgevingsloket and read permit-free building.

What foundations and structure does a garage need?

An attached garage gets its own foundations. In West-Friesland and the rest of Noord-Holland the soil often consists of clay and peat, so depending on the ground this will be a strip foundation or a piled foundation. The floor must carry the weight of a car. Read foundations for an extension for the considerations.

A flat roof is common, because it looks clean and keeps the height limited. How such a roof is built up is explained in flat roof extension.

  • Foundations suited to the soil type
  • A floor that carries the weight of a car
  • Up-and-over or sectional door, manual or electric
  • A neat connection to the roof edge and facade

Insulate or not: what will you do with the garage later?

If you only use the garage for the car and bikes, insulation is not always necessary. If you want to turn it into a workshop, utility room or later living space, it is wise to choose an insulated floor, walls and roof now. Insulating afterwards is usually more expensive and takes up space inside. If you are already thinking of an extra room, read converting a garage into living space to see what is needed.

How do we help with a garage extension?

Bettine Sloots, whose attic we converted in Heerhugowaard, wrote in her Google review that Richard later also helped with a garage extension. A follow-up job like that fits the way we work: one fixed point of contact who already knows the house. If you wish, we also take care of the drawings and the permit.

Read more about extending under extension and what an extension costs. After a no-obligation conversation you receive a tailored quote.

Frequently asked questions

What is the difference between a garage extension and a carport?

A carport is an open canopy on posts, a garage is closed on all sides and lockable. A garage therefore also offers room for storage or a workshop, but needs foundations and costs more. A carport is more often permit-free, although that too depends on the location.

How long does building a garage extension take?

The construction itself often takes three to six weeks, depending on foundations, brickwork and finishing. Before that come the design and, if needed, the permit procedure. For an environmental permit, a decision period of eight weeks generally applies.

Can I convert a garage extension into living space later?

Yes, if the structure and insulation have been prepared for it. An insulated floor, enough height and a place for a window or glazed door make a later conversion much easier. The conversion itself may require a permit.

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Call or message Richard Vlieland on +31 6 11 78 63 20, or request a free quote. We are happy to come and have a look.

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