Unlike a condo, buying a house means the land's own legal status and its road access have a direct bearing on resale value and future rebuilding. In short, two things are essential to check before signing a contract: whether boundary markers exist and a boundary confirmation agreement is in place, and whether the property's road access meets the road-frontage requirement. It's easy to focus on the building's layout and equipment, but not putting off checking the land itself is especially important when buying a house.
- For a house, always check whether the land's boundaries are confirmed — whether boundary markers exist and a boundary confirmation agreement is in place.
- Under the Building Standards Act, a plot of land must, in principle, front onto a road at least 4 meters wide for at least 2 meters (the road-frontage requirement).
- Land that doesn't meet the road-frontage requirement can become an "unrebuildable" property, meaning no future rebuild is possible.
- For land facing a private road, you need to check the private road's ownership and whether consent has been obtained for passage and excavation.
- If the boundary hasn't been confirmed, it's common for the seller to arrange and pay for a boundary-fixing survey before handover.
Check the Land's Boundaries
The first thing to check when buying a house is the land's boundaries. Confirm whether boundary markers (concrete stakes, metal pins, and so on) are in place along the border with the neighboring lot, and whether a "boundary confirmation agreement" (kyōkai kakunin-sho) has been exchanged with the neighboring owner regarding the boundary's location. If the boundary stays ambiguous, it can lead to trouble with the neighbor down the road. Boundary markers can sometimes be old and hard to make out, or there may simply be a block wall between the lots with no formal boundary confirmation agreement in place, so it's worth always checking whether the documentation exists.
The Road-Frontage Requirement and "Unrebuildable" Properties
Under the Building Standards Act, a plot of land must, in principle, front onto a road at least 4 meters wide for at least 2 meters — the road-frontage requirement (setsudō gimu). Land that doesn't meet this requirement can become "unrebuildable" (saikenchiku fuka), meaning that even though a building currently stands there, no future rebuild is possible. Checking which road the land fronts onto, and how much of it does, before you buy is essential. Unrebuildable properties are sometimes priced below the local market rate to offset the fact that they can't be rebuilt, but this needs to be considered with a full understanding of how it affects a future move or resale value.
Points to Watch for Land Facing a Private Road
If the land fronts onto a private road (shidō), you need to check who owns it — whether it's jointly owned or owned by a specific individual — and whether consent for passage and excavation has been obtained. If you don't hold a share of the private road, you may need the road owner's consent down the road for work such as water supply or drainage pipe construction, so checking this in advance is important. Whether an excavation consent document for the private road has been obtained in the past also affects procedures for future renovation or rebuilding, so it's reassuring to check that as well.
How a Boundary-Fixing Survey Proceeds
If the boundary is unconfirmed, or only some boundary markers exist, the common approach is for the seller to arrange and pay for a boundary-fixing survey (kyōkai kakutei sokuryō) before handover, fixing the boundary with the neighboring owner present. Because a survey takes a certain amount of time, checking the schedule at the time of contract makes it easier to plan toward handover. Coordinating a date with the neighboring owner can sometimes take time depending on their availability, so it's best to allow some margin in the schedule.
Other Points Worth Checking When Buying a House
Beyond boundaries and road access, other checkpoints specific to houses include the ground condition, encroachments (whether a neighbor's trees, piping, or similar extend onto your land), and whether a retaining wall exists and how safe it is. Carefully checking land-related information through your agent, not just the building itself, brings peace of mind after your purchase. On land with a retaining wall in particular, repair costs can run high depending on how deteriorated it is, so having a specialist check its current condition is worth considering.
Frequently Asked Questions
Can I buy land that has no boundary markers?
The purchase itself is possible, but it's common to have a boundary-fixing survey done before handover to make the boundary clear. Since the seller often bears the cost, it's worth confirming this at the time of contract.
What is an "unrebuildable" plot of land?
Land that doesn't meet the road-frontage requirement under the Building Standards Act — fronting a road at least 4 meters wide for at least 2 meters — can become an unrebuildable property, meaning that even if a building currently stands there, no future rebuild is possible.
What should I watch for when buying land that faces a private road?
You need to check who owns the private road and whether consent for passage and excavation has been obtained. If you don't hold a share of the private road, it can affect future construction work.
Summary
Buying a house means checking not just the building's condition, but also whether the land's boundaries are confirmed, whether it meets the road-frontage requirement, and the legal status of any private road. Confirm these points through your agent before signing, and avoid trouble down the road.