Do I need a building permit for a garden shed in Lower Saxony?

No, as long as it remains a building without a habitable room, toilet or fireplace and has no more than 75 cubic metres of gross volume, or no more than 40 cubic metres outside built-up areas (NBauO, annex to § 60, no. 1.1). If it is to stand on the boundary without a distance, it may not be higher than 3 metres (NBauO § 5 (8)). Development plans and local regulations still apply (NBauO § 59 (3)); if in doubt, the building control authority can advise.

Can a patio roof stand right on the boundary with the neighbour?

A patio roof is only permit-free if its floor area is no more than 40 square metres and it keeps at least 3 metres from the boundary of the neighbouring plot (NBauO, annex to § 60, no. 1.8). If the patio is closer to the boundary, as with many terraced houses, this exemption does not apply. Which procedure is then needed and whether the roof is allowed in that spot is for the building control authority to clarify.

How large can a pool be without a permit application?

Water basins are permit-free up to 100 cubic metres of basin volume; outside built-up areas only as an ancillary structure to a building with habitable rooms no more than 50 metres away (NBauO, annex to § 60, no. 9.6). A pool of 8 by 4 metres and 1.50 metres deep holds 48 cubic metres. An air-supported cover remains permit-free up to 100 square metres of floor area (NBauO, annex to § 60, no. 9.7).

Does permit-free mean that no rules apply?

No. Permit-free building work must meet the requirements of public building law just like work that needs a permit (NBauO § 59 (3)). Development plans, local building regulations and boundary distances continue to apply, and permit requirements under the heritage protection act, for example, remain unaffected. Permit-free only means that no permit application is filed.

Do these thresholds also apply in other German states?

No. Every state has its own building code with its own thresholds, and the figures given here come from the annex to § 60 of the Lower Saxony Building Code. Businesses that also build outside Lower Saxony should give the rules per state on their service page or expressly limit the overview to Lower Saxony. Transferring figures from another state to your own region easily leads to wrong information.

What should a business say about permits on its website?

The thresholds with legal reference and version date, a worked example and a note that development plans and distances continue to apply. No promise such as "you won't need a permit for that", but a description of the pre-check: the business classifies, the building control authority decides. This goes together with a form that asks for dimensions, location, use and boundary distance.

Garden Sheds, Patio Roofs, Pools: What Needs No Permit

In October, customers ask different questions than in May. Anyone thinking about next year's garden in the autumn asks not only about paving and planting, but about a garden shed, a roof over the patio or a pool for the summer. The second question usually follows right away: does it need a building permit? In Lower Saxony, an annex to the state building code answers that. A building without a habitable room stays permit-free up to 75 cubic metres (NBauO, annex to § 60, no. 1.1) of gross volume, a patio roof up to 40 square metres (NBauO, annex to § 60, no. 1.8) of floor area if it keeps 3 metres (NBauO, annex to § 60, no. 1.8) from the neighbouring boundary, and a water basin up to 100 cubic metres (NBauO, annex to § 60, no. 9.6) of basin volume. A business that explains these thresholds on its service page and asks for the relevant dimensions in its enquiry form comes across as a planner before the first appointment is even booked. This article shows which garden structures need no building permit under Lower Saxony law, where the limits are, why "permit-free" does not mean "rule-free" — and how a website can take over this pre-check.

Key takeaways

In Lower Saxony, a garden shed with no habitable room, toilet or stove is permit-free up to 75 m³ of gross volume, and up to 40 m³ outside built-up areas (NBauO, annex to § 60, no. 1.1).
A patio roof with up to 40 m² of floor area needs no permit application as long as it stays at least 3 m from the neighbouring boundary (NBauO, annex to § 60, no. 1.8).
Water basins up to 100 m³ and earth fills or excavations up to 3 m in height or depth are permit-free; extra conditions apply outside built-up areas (NBauO, annex to § 60, no. 9.6 and 7.1).
Permit-free structures must still comply with public building law: development plans, boundary distances and heritage protection continue to apply (NBauO § 59 (3)).
The enquiry form asks for the project, length, width, height, planned use and the distance to the neighbouring boundary, so the permit question is settled before the site visit.
October to February is planning time: settle the classification and open questions with the building authority now, and build in spring instead of waiting for an answer in April.

Why the permit question belongs before the quote

For the customer, a garden shed, a patio roof or a pool is first a wish and only then a building project. That is why the permit question rarely appears in the first sentence of an enquiry; it comes up at the first appointment — often at the very moment the business is already taking measurements. If it cannot be answered then, the whole project slips: the customer wants to check with the building authority first, the quote sits on the table, and in spring the slot that could have been planned over the winter is missing.

The basic rule is set out in the Lower Saxony Building Code (NBauO). Building work requires a permit from the building control authority unless the following provisions say otherwise (NBauO § 59 (1)). One of these exceptions is § 60: the structures listed in the annex may be erected and altered without a building permit to the extent set out there; the law calls them permit-free building work (NBauO § 60 (1)). The annex is a long list of numbered items, from heating systems to farm tracks. For the garden, four groups matter most: buildings without habitable rooms, patio roofs, water basins, and earth fills and excavations. The annex currently applies in the version in force from 1 July 2025 (NI-VORIS, annex to NBauO § 60).

For the business, this list is more than a legal question. It is a filter that shows, before the site visit, whether a project can start without an official lead time or whether a permit application will set the schedule. A website that does this classification in advance receives enquiries that already contain dimensions and location — and saves the appointments that end with nothing more than "you will have to ask the building authority first". How enquiries can be spread over the year is shown on our page on seasonal planning for your website; how to reach clients before they move into a new build is described in the article on new-build outdoor areas.

The garden shed: 75 cubic metres of gross volume

The garden shed falls under the very first item of the annex. Buildings and extensions without habitable rooms, toilets and fireplaces or stoves are permit-free if they have no more than 75 cubic metres (NBauO, annex to § 60, no. 1.1) of gross volume, and no more than 40 cubic metres (NBauO, annex to § 60, no. 1.1) outside built-up areas. There is also a limit on use: the building may not serve sales or exhibition purposes or the parking of motor vehicles. A carport or a garage is therefore not a garden shed in the sense of this item and follows rules of its own.

No habitable room

A room in which people are meant to spend longer periods of time falls outside the exemption. That applies to a garden office with a desk as much as to a guest room at the bottom of the garden. A tool shed or a garden building for furniture and equipment, on the other hand, will usually stay within the limits.

No fireplace or stove

A wood burner in the garden building or a wood-fired sauna stove turns the little house into a building with a fireplace. The exemption for buildings without habitable rooms then no longer applies — however small the building is.

No toilet

A toilet also rules out the exemption. An outdoor tap for a watering can and hose is a different matter; anyone planning more water in the garden building should settle the question before the quote, not after the building is up.

External dimensions count

What counts is the gross volume, calculated from the external dimensions including walls and roof. Measuring only the usable interior gives a figure that is too low — and the mistake shows only once the kit has been ordered.

A worked example shows how quickly the limit is reached. A garden building measuring 4 by 5 metres on the outside with an average height of 3 metres comes to 60 cubic metres and therefore stays below the 75 cubic metres (NBauO, annex to § 60, no. 1.1). The same building at 5 by 6 metres comes to 90 cubic metres and is above it. Outside built-up areas, even a small shed of 3 by 4 metres at the same height reaches 36 cubic metres, close to the limit of 40 cubic metres (NBauO, annex to § 60, no. 1.1). For the service page this means: it is not the floor area that decides, but the volume, and the volume depends on the shape of the roof.

Sauna, office, workshop: when the garden shed becomes something else

Many enquiries start with "a garden shed" and mean something else: an office for working from home, a sauna with a wood stove, a heated workshop. Each of these uses can tip the project out of the exemption, because it creates a habitable room or a fireplace. That is why the enquiry form asks not only for dimensions but also for the planned use.

The second question for a garden building is where it will stand on the plot. In Lower Saxony, buildings generally keep a distance of 0.4 H from the boundary, where H stands for the height, but at least 3 metres (NBauO § 5 (2)). There is an exception for garages and buildings without habitable rooms and fireplaces: they may be built without any distance or with a distance reduced to 1 metre (NBauO § 5 (8)) if they do not exceed a height of 3 metres (NBauO § 5 (8)). This applies over a total length of 9 metres (NBauO § 5 (8)) per boundary and over no more than 15 metres (NBauO § 5 (8)) on the whole plot. A garage that already stands on the same boundary without a distance counts towards this (NBauO § 5 (8)). Anyone who wants the shed in the corner should therefore also ask what already stands along the boundary.

The patio roof: 40 square metres, 3 metres from the boundary

For a patio roof, the annex sets two conditions that must both be met. Patio roofs with no more than 40 square metres (NBauO, annex to § 60, no. 1.8) of floor area are permit-free if they keep a distance of at least 3 metres (NBauO, annex to § 60, no. 1.8) from the boundary of the neighbouring plot. The area is rarely the problem: a roof over a patio of 6 by 5 metres covers 30 square metres and stays well below the limit. The distance is the problem more often.

With terraced and semi-detached houses, the patio often runs right up to the boundary or to within a metre of it. There, the exemption for the roof does not apply, even if the patio itself was built long ago. In rows of terraced houses this is far from unusual — and it is exactly the point at which a quote without a pre-check comes to nothing. Conservatories work in a similar way: they are permit-free up to 30 square metres (NBauO, annex to § 60, no. 1.8) of gross floor area and 5 metres (NBauO, annex to § 60, no. 1.8) in height, again only with 3 metres of distance from the neighbouring boundary.

The patio itself — surface, sub-base and edging — is permit-free as a garden design feature, as are pergolas, benches and seating areas, with the exception of buildings and enclosures (NBauO, annex to § 60, no. 9.1). For paving contractors this is good news and an opportunity to add to the offer: whoever builds the patio can treat the roof as the next step and settle the distance question when taking measurements. How to explain sub-base and falls in plain terms is shown in the article on explaining paving work; what the matching service page looks like is described on our page about a website for paving contractors.

Project	Limit in the annex to NBauO § 60	What to settle before the quote
Garden shed, tool shed	up to 75 m³ gross volume, up to 40 m³ outside built-up areas (item 1.1)	external dimensions, roof shape, use, stove or toilet
Patio roof	up to 40 m² floor area, at least 3 m from the neighbouring boundary (item 1.8)	floor area, position relative to the boundary, fixing to the house
Conservatory	up to 30 m² gross floor area and 5 m height, also 3 m from the boundary (item 1.8)	whether the customer actually means a heated living space
Pool, water basin	up to 100 m³ basin volume, outside built-up areas only within 50 m of a house (item 9.6)	length, width, depth, equipment, cover
Earth fill, excavation	up to 3 m height or depth, outside built-up areas max. 300 m² and not for ponds (item 7.1)	level differences, soil volumes, proximity to the boundary
Patio, pergola, seating area	permit-free as a garden design feature, except buildings and enclosures (item 9.1)	surface, sub-base, whether a roof may follow later
Retaining wall, enclosure	retaining wall up to 1.50 m, enclosure up to 2 m in height (items 6.2 and 6.1)	height above ground, line along the boundary

Pools and water basins: 100 cubic metres of basin volume

For pools, plunge pools and other water basins, the annex sets a volume limit. Water basins with no more than 100 cubic metres (NBauO, annex to § 60, no. 9.6) of basin volume are permit-free. Outside built-up areas this only applies if the basin is an ancillary structure to a building with habitable rooms no more than 50 metres (NBauO, annex to § 60, no. 9.6) away. A pool of 8 by 4 metres with a water depth of 1.50 metres holds 48 cubic metres and is clearly within the limit; a large basin of 12 by 6 metres at the same average depth would hold 108 cubic metres and be above it.

A pool often involves more than the pool itself. An air-supported cover is permit-free up to 100 square metres (NBauO, annex to § 60, no. 9.7) of floor area if the pool itself is permit-free; fixed enclosures are not mentioned in this item. A small plant room for pump and filter is a building without a habitable room and is usually assessed under the garden shed rule. Whether a swimming pond counts as a water basin or as an excavation depends on how it is built and, if in doubt, belongs in a query to the building authority. For pond builders this is a topic for a page of its own: our website for pond builders shows how such projects can be presented, and the article on setting expectations for ponds describes what should be discussed before construction.

Landscaping the ground: fills and excavations up to 3 metres

Mounds, hollows, terraced garden levels and the excavation for a sunken patio are all earth fills and excavations. Stand-alone fills and excavations are permit-free up to 3 metres (NBauO, annex to § 60, no. 7.1) in height or depth. Outside built-up areas this only applies if they are not used to create ponds and cover no more than 300 square metres (NBauO, annex to § 60, no. 7.1). "Stand-alone" essentially means that the earthworks stand on their own and are not part of another building project.

Here, too, the law separates the permit from the distance. Along the boundary, retaining walls, earth fills and enclosures outside commercial and industrial areas need no distance only up to a height of 2 metres (NBauO § 5 (8)). A fill of 2.50 metres can therefore be permit-free and still have to keep its distance from the boundary. Retaining walls themselves are permit-free up to 1.50 metres (NBauO, annex to § 60, no. 6.2) above ground level, enclosures up to 2 metres (NBauO, annex to § 60, no. 6.1). What this means for fences and screening is described in the article on fencing and screening enquiries; how soil volumes and disposal find their way into the quote is covered in the article on excavated soil and disposal in the quote.

Permit-free does not mean rule-free

The most important sentence for the service page is not in the annex but one section earlier. Building work that is exempt from a permit or from any procedure must meet the requirements of public building law just like work that needs a permit (NBauO § 59 (3)). Permit requirements in other legislation, notably in the heritage protection act and in planning law, remain unaffected (NBauO § 59 (3)). Permit-free therefore means: no permit application. It does not mean that the other rules fall away.

Local development plan. It can specify which parts of the plot may be built on and exclude ancillary structures in certain areas. A garden shed can be permit-free and still not be allowed in that spot.
Local building regulations. Municipalities can set rules on design, materials or roof shapes. Such bylaws also apply to structures built without a permit application.
Boundary distances. The distance rules of the building code apply regardless of the procedure (NBauO § 5). A permit-free garden shed placed too close to the boundary is still unlawful.
Heritage protection. If the house or the garden is a listed monument, permit requirements under the heritage protection act remain in place (NBauO § 59 (3)).
Neighbour law and trees. Plants are subject to the distances of neighbour law, which the article on boundary distances for trees and hedges explains. If a tree has to make way for a garden shed, a municipal tree protection bylaw and felling seasons may come into play as well.

If in doubt, the building authority decides

The thresholds in the annex are a pre-check, not a ruling on an individual case. If a project sits close to a limit, lies outside built-up areas, falls within a development plan with tight provisions or affects a listed building, the question belongs with the responsible building control authority before construction. The website therefore does not say "you won't need a permit for that", but describes what the business checks in advance and who makes the decision.

The pre-check on the service page

On the website, the thresholds become a tool. The service page for garden buildings, patio roofs or pools does not explain the entire building code; it answers the question the customer would ask: can I have this built without applying for a permit first? Four building blocks carry this page.

An overview of the thresholds

A short table with project, threshold and legal reference classifies the project at a glance. It names the law and the version, so the reader can see where the figure comes from and when it was last checked.

A volume calculator

A worked example with external dimensions and average height shows how the gross volume is calculated. Customers who can do the sum themselves understand why a slightly larger garden shed suddenly needs an application.

A sketch of the layout

A simple site plan with house, patio and plot boundary makes the distance visible. Without citing sections, it explains why a patio roof on a terraced house has to be treated differently from one on a detached house.

A clear pointer to the building authority

A paragraph explains when it makes sense to ask building control and offers to prepare the query together. That shows expertise without anticipating a decision the business is not entitled to make.

For private gardens, the service page brings these topics together best in one place, because garden shed, patio and pool often come together in the same project. How such a page is structured is shown by our website for private garden specialists. Businesses that sell a design before construction can make the pre-check its first building block; how design work can be charged as a service of its own is described in the article on charging for garden design instead of free plans.

What the enquiry form asks in advance

The form translates the thresholds into questions. It does not have to explain the legal position to the customer; it collects the details the business needs to make the classification itself. Five details carry most of the weight; everything else is settled at the site visit.

Project. Garden shed, patio roof, conservatory, pool or earthworks — as a selection, so that the relevant item of the annex is clear straight away.
Dimensions. Length, width and height for a building, floor area for a roof, length, width and depth for a pool. A rough figure is enough to see whether the project is close to a limit.
Position on the plot. Where will it be built, and how far is that spot from the neighbouring boundary? A photo with the spot marked helps more than any description.
Use. Storage, living space, sauna or workshop; are electricity, water or a stove planned? For a garden shed, this question decides whether it stays permit-free.
Development plan and location. Is a local development plan known, is the plot outside built-up areas, is the house listed? "Don't know" is a valid answer — it shows where further questions are needed.

garden-structure-enquiry.json

{
  "form": "garden-structure-enquiry",
  "required": [
    { "name": "project", "label": "What would you like to have built?",
      "options": ["Garden shed", "Patio roof", "Conservatory", "Pool or basin", "Earthworks and levels"] },
    { "name": "dimensions",          "label": "Approximate size: length, width, height or depth" },
    { "name": "boundary_distance_m", "label": "Distance to the neighbouring boundary in metres" },
    { "name": "use",                 "label": "Planned use",
      "options": ["Storage", "Living space or office", "Sauna or stove", "not decided yet"] }
  ],
  "optional": [
    { "name": "development_plan", "label": "Is there a local development plan?",
      "options": ["yes", "no", "don't know"] },
    { "name": "photos",           "label": "Photos or a sketch of the spot" }
  ]
}

The boundary distance field is the most important one, and it is also the one missing from a general contact form. For a patio roof, it decides whether the project is permit-free; for a garden shed, whether building on the boundary is an option. How a form that pre-sorts enquiries is structured in general is shown in the article on an enquiry form that qualifies; the finished implementation can be found on our page about the enquiry form for landscaping businesses.

Winter as planning time for the spring season

Garden sheds, patio roofs and pools are built in spring and decided in winter. A customer who enquires in April wants the job finished in May — and then has no time left for a query to the building authority or a permit application. October is therefore a good time to revise the service page: the maintenance season is winding down, customers are indoors thinking about next year, and the business has room for site visits.

Step 1

October to November: collect enquiries

The service page with thresholds and form is online. Enquiries arrive with dimensions, location and use, and the business sorts them in advance: clearly permit-free, close to a limit, or requiring an application.

This planning time can be combined with other winter topics. A business that is already talking about replacement planting in the autumn, as described in the article on drought-tolerant planting, is standing in the garden with the customer when the garden shed for next year comes up. A planting appointment turns into a conversation about the whole plot.

The permit question as a planning service

A business that knows the thresholds of the building code and explains them on its website sells more than construction. It takes the first and most uncertain question off the customer's hands before an appointment has been made. A vague enquiry about a garden shed becomes a project with dimensions, location and a clear path — and in winter the customer already sees the business as the one that showed them that path.

Common mistakes on pages about garden structures

The following points come up regularly on pages about garden sheds, patio roofs and pools. Each of them on its own means that the permit question only surfaces at the appointment — or only once construction has begun.

Figures from other states. Thresholds circulating online for other German states do not apply in Lower Saxony. Copying them puts wrong information on your own page.
Area instead of volume. For a garden shed, it is the gross volume that counts, not the floor area. A page that only gives square metres misleads customers who want a high roof.
Nothing about distance. For a patio roof, the distance to the neighbouring boundary is decisive. Without this note, the owner of a terraced house plans with an exemption that does not apply to them.
Permit-free as a free pass. Mentioning only the exemption while leaving out development plans, distances and heritage protection promises more than the building code allows.
No source, no date. The building code changes; the annex currently applies in the version in force from 1 July 2025 (NI-VORIS, annex to NBauO § 60). A page without a legal reference and date cannot be kept up to date.
A form without dimensions. A general contact form asks for neither size nor location. The classification then only starts at the site visit, and the trip cannot be assessed beforehand.

All six points share the same rule: describe what is checked, and say openly who decides. A service page written this way stays correct even when an individual case turns out to need a permit application — and it turns that news into a next step rather than a disappointment.

Sources and legal basis

This article draws on the Lower Saxony Building Code (Niedersächsische Bauordnung, NBauO), in particular § 5 (boundary distances), § 59 (permit requirement), § 60 (permit-free building work) and the annex to § 60 (1) in the version in force from 1 July 2025, retrieved from the Lower Saxony legislation information system NI-VORIS. The information is general in nature, applies to Lower Saxony only and does not replace advice from the building control authority in an individual case.