What does an extension to my shed cost?

The costs for building or renovating a shed depend on various factors, such as the size, the choice of materials, the foundation and the finish. The overview below provides an indicative estimate of common variants.

1. Guideline prices per type of shed

2. Price structure per m² (average)

3. Examples total prices

4. Cost-determining factors

• Material choice: Wood is more advantageous than stone or steel; prefab cheaper than custom work
• Foundation type: Frost-free foundation or concrete slab required for heavier constructions
• Insulation & installations: Heating, electricity and finishing increase the price
• Intended use: Storage, workspace or recreational use requires different finishing

5. Permit and regulations

• Building a shed is possible without a permit under certain conditions:
• Maximum 30 m², behind the house, no higher than 3 meters
• Not in a protected area or on a plot without a residential function
• Always check the local zoning plan and the environmental desk

Conclusion
The price for a shed varies from a few thousand euros for a simple wooden version to €30,000 or more for an insulated multifunctional space with amenities. A detailed design, clear material selection and insight into the destination are crucial for a accurate cost estimate.

The indications below give a realistic picture of what you will spend on average on various types of sheds, depending on size, finish and usage function.

Example 1: Simple wooden shed (3 × 2 meters)

• Area: 6 m²
• Type: Uninsulated, single-walled wood, flat roof
• Use: Garden tools, bicycle storage
• Foundation: Paving slabs or concrete piers
• Facilities: No electricity or insulation

Total price indication:
€2,000 – €3,200

Example 2: Wooden shed with canopy (5 × 3 meters)

• Surface area: 15 m² + 9 m² canopy
• Type: Wood with luxury facade finish, pitched roof
• Use: Garden storage and seating area
• Foundation: Concrete strips or screw foundation
• Facilities: Simple electrics, gutter

Total price indication:
€7,500 – €11,000

Example 3: Insulated work/hobby space (6 × 4 meters)

• Surface area: 24 m²
• Type: Fully insulated wooden shed
• Use: Studio, workspace, tool storage
• Foundation: Reinforced concrete slab

Total price indication:
€18,000 – €28,000

Example 4: Brick shed (4 × 3 meters)

• Surface area: 12 m²
• Type: Half-brick masonry, pitched roof with roof tiles
• Use: Durable storage, long-term use
• Foundation: Frost-free strip foundation
• Facilities: Electricity, lighting, insulated roof

Total price indication:
€12,000 – €19,000

Example 5: Prefab shed (standard package)

• Dimensions: 3 × 3 meters (9 m²)
• Type: Prefabricated wooden kit, delivered and installed
• Use: Garden storage
• Foundation: Tile bed or simple post foundations

Total price indication:
€4,000 – €6,500

Please note:
The final price depends on location, design, accessibility of the plot, choice of materials, any permit requirements, installations and customization.

A project-specific quotation is required for exact price quotes.

The final costs for building or renovating a shed depend heavily on technical, aesthetic, and functional choices. The overview below lists the most influential factors.

1. Dimensions of the shed

The larger the surface area, the higher the total costs. At the same time, the costs per m² often decrease for larger projects due to economies of scale.

• Small shed (≤10 m²): relatively higher m² price
• Medium-sized shed (10–20 m²): most cost-effective in price-quality
• Large shed (>20 m²): higher total price, lower relative costs per m²

2. Choice of materials

The choice of materials largely determines the base price, durability, and finishing quality.

• Wood: cheap, quick to build, limited maintenance
• Masonry (brick/concrete): more durable, higher labor costs
• Prefab (wood/metal): cheaper with standard dimensions, less customization possible

3. Foundation

The nature of the subsoil and the intended use determine the type of foundation and thus the costs.

• Simple paving slabs or gravel bed (only for light constructions)
• Concrete piers or screw foundation: common with wooden sheds
• Concrete slab or frost-free foundation: required for heavier or insulated constructions

4. Insulation and functional use

A shed intended for more than storage (e.g. workspace, home office or hobby room) requires:

• Roof, floor and wall insulation
• Double glazing or HR++ windows
• Electrical connections, heating and ventilation

These elements can more than double the costs compared to a simple storage shed.

5. Finishing and extra options

The more luxurious the finish, the higher the costs. Think of:

• Interior panelling or plasterboard walls
• Luxury facade cladding or wooden cladding
• Canopy, veranda or French doors
• Attic floor or storage loft

6. Accessibility of the construction site

A difficult to reach location (narrow passage, no back entrance, limited workspace) increases labor and transport costs.

7. Permit and design

Some sheds fall under permit-free construction, others require:

• A building permit
• Construction drawings and structural calculations
• Municipal fees

These additional costs can amount to several hundred euros.

8. Labor costs and executor

• Local freelancers can be more advantageous for standard work
• Construction companies with guarantees and quality marks charge higher rates
• Region has influence: hourly rates differ per province (randstad vs. countryside)

Conclusion
The costs of a shed depend on more than just size and material. The function, construction method, accessibility, regulations and finish are decisive for the final budget. A clear inventory in advance prevents surprises afterwards.

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Building a shed requires careful preparation and structured execution. The following step-by-step plan helps to make the process clear and efficient – from orientation to completion.

Step 1. Goal setting and function

Determine the main purpose of the shed:

• Storage space
• Workshop or hobby room
• Home office
• Garden house or guest house

The chosen function determines the technical requirements, finish and permit requirement.

Step 2. Global sketch and dimensions

Make a rough sketch with desired:

• Dimensions (length x width x height)
• Layout and desired access (door/windows)
• Canopy or extension (option)

Determine whether the shed will be detached or attached.

Step 3. Check regulations and permits

• Consult the environmental desk to check whether a building permit is required.
• Check local zoning plans, requirements of the design code and any rules for protected townscapes or monuments.
• Fixed dimensions and placement conditions apply to permit-free construction.

Step 4. Have a design and quote drawn up

• Have a technical design made (possibly with an architect or architectural draftsman).
• Request at least three quotes from recognized construction companies or prefab suppliers.
• Pay attention to specifications regarding foundation, material, roof construction, insulation, finishing and installations.

Step 5. Apply for a permit (if necessary)

• Submit the application via the Omgevingsloket online.
• Add construction drawings, site plan and structural data.
• Take into account a processing time of 8 to 14 weeks.

Step 6. Preparation construction site

• Arrange a free and accessible workplace.
• Provide a flat surface or temporary foundation.
• Coordinate the removal of soil, debris and building materials with the contractor.

Step 7. Execution structural work

• Earthworks and foundation (paving stones, piers, concrete floor)
• Placement of wooden frame, prefabricated elements or masonry
• Roof construction and waterproof finish

Note: Check intermediately whether the execution corresponds to the specifications.

Step 8. Finishing and installations

• Windows, doors, locks and gutters
• Electricity, lighting, heating and possibly water connection
• Interior finishing: floor, walls, possibly insulation or attic

Step 9. Completion and finalization

• Check the delivered quality together with the contractor
• Have defects or completion points recorded in writing
• Ask for proof of warranty, invoices and, if applicable: structural approval

Step 10. Ready for use

• Setting up the shed
• Possible placement of cabinets, workbenches or furniture
• Register with insurer (in case of extensive function or valuable contents)

Conclusion
A successful realization of a shed starts with a clear goal, a thoughtful design and timely testing of regulations. By following the step-by-step plan, an overview of preparation, execution and cost control is created.