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How much does a garden room cost?

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Price guide

$10,000 - $70,000







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One practical way to have an extra room in your area is to build an outdoor space. An outdoor room can also be a garden, visitors' area, home office, man cave, or home gym. 

We know how troublesome it is to build a room extension. Thankfully, a garden extension is simpler than a direct house extension, as nothing needs dismantling or alteration. Read on to learn the cost of building a garden room extension.

Garden room price list




$10,000 to $70,000


$15,000 to $60,000


$10,000 to $50,000


$20,000 to $60,000


$15,000 to $35,000

Different outdoor rooms and their costs

Outdoor rooms are rising in popularity as home improvement products. They increase the size of a property’s living space, thereby adding value to your place. Outdoor rooms can be patios, patio enclosures, gazebos, or garden rooms.


A patio is an open space made using concrete or wooden materials. The estimated total of building a patio is $1,900 to $5,500. Concrete patios cost $4 to $7 per square foot, while wooden ones cost $8 to $22 per square foot.

Patio enclosures

These have glass walls, screen rooms, or fabric drop curtains. The cost of a patio enclosure is $1,600.


These are free-staging structures, usually in the center of gardens. They provide shade and shelter from the rain or harsh UV rays. Building a gazebo can cost you $6,000.

Garden rooms

Garden rooms are unique because they're often habitable. You can use them as a home office, gym, or anything you like!

  • A modern garden room features natural materials and light, mostly leaning into a monochromatic palette.
  • A Victorian garden room involves classic designs with softer angles.
  • Natural garden rooms are ideal if you prefer rustic designs with wooden floors and organic colors.
  • Gable garden rooms typically have intricate window designs.
  • A Mediterranean/lean-to garden room is full of natural light. You invest more in windows.

Factors affecting garden room costs 


You can choose between modular and bespoke designs. A modular garden room is pre-made and ready for installation, while a bespoke one is tailor-made for your wants and needs.


The base of a garden room must be in top condition to withstand sudden weather changes. We suggest asking a professional to assess your area, as they know the best base to use. 

A concrete slab base involves deep excavation and a mixture of concrete, bricks, and stone). Plinths are suitable for smaller garden rooms. Professionals use reinforced concrete as the base of a room, protecting it from pressure.

Another option is ground screws. Instead of digging a hole, professionals drive large screws of 1.2 m to 5.0 m into the ground to provide a base to build your frame.


Some people choose to have a garden room without electricity. However, if you decide to host a small party in the area, you might need more than an extension cord. The cost of installing a power system for your garden room depends on your local electrician.

a fully furnished garden room


Most garden rooms require the same building techniques as typical room extensions in your house. Therefore, insulated roofs, walls, and floors are vital to your garden room construction. You can opt for timber cladding or an oakwood outdoor room for no-fuss insulation. Otherwise, consider using structural insulated panels or SIPs, which have a foam core in between two structures for more protection inside your room.


Working with an interior designer can cost more. However, having an extra comfortable room will add value to your home. Door and window installation starts at $2,500.

Kitchens and Bathrooms

Having a kitchen and bathroom installed in your garden room extension is wise. However, it can be more expensive. Prices depend on the materials you choose.


The delivery of materials depends on your location. While most companies offer free delivery, it is best to discuss it with tradespeople for accurate quotes.


A builder’s labor cost for outdoor rooms is usually $10 to $20 per hour. It's better to talk to your contractor so that you can agree on a specific number of days to finish the project. This can help you set a budget for your garden room extension.

Planning permissions or building permits for garden rooms

Different states have specific planning permissions. Planning permissions and building permits are essential, especially if you need the certificates when you decide to sell your house. Check your government’s website to determine if your area is safe to occupy and adheres to safety regulations. 

Here are the steps to follow when obtaining a building permit:

  1. Contact your local government and let them know about your project. You might need a permit if you need electrical or plumbing systems for your outdoor room.
  2. Prepare the information needed (work plan, drawings, contractor license if applicable) and process the permit.
  3. Submit the building permit and pay the fee. The licensing department will then give you the official certificate.
  4. Ask for the inspector to visit the area and check the quality of the work. Once approved, the certificate no longer needs to be displayed.

You can look at local planning policies on government websites. Visit Texas or Florida permit and licensing websites for state-specific instructions.

Finding a Tasker to work on your garden extension

Looking for a skilled tradesperson to do the job can be a headache, especially when there are several things to work on. It is vital to find professional architects, roof installers, and plumbers

Organizations like the Construction Association of America or the American Institute of Contractors promote and protect the integrity of their industry by making sure that members provide quality work. Subsequently, you can ask for the Tasker's portfolio to check their previous projects.

Taskers can help you complete your outdoor/garden room project. Here are the things you need to list so that we can’t find the right match for you:

  1. The service you need
  2. Measurement of the area
  3. Your budget
  4. Your location
  5. Extra jobs you require (e.g., electrical or plumbing installation)

Take the stress away and let Airtasker do the job for you!

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A garden room usually takes one to four weeks to finish, depending on the size of your area and if it's modular or bespoke.

Help your builder/tradesman by removing rocks, trees, shrubs, and other obstructions. Remember that an even area results in a faster building process.

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