A plot can be perfectly clean of disputes and correctly zoned for construction — and still not be buildable as intended, because above it runs a high-voltage power line or at its foot lies a dyke’s protection corridor. Infrastructure protection corridors are the invisible restriction layer on the land-map: they do not take away land use rights, but they cut building rights in ways investors discover only when the permit file comes back rejected. This is the cheapest appraisal risk to check before buying — and the most expensive to skip.
The corridor map: each work has its own law
There is no single corridor law — each infrastructure type has its own protection corridor under sector law. The irrigation-works protection corridor under the Law on Irrigation 08/2017/QH14 surrounds canals, dams and reservoirs with a range measured from the work’s foot. The dyke protection corridor under the Law on Dykes runs along both sides of dyke lines, limiting excavation, construction and tree planting affecting the dyke body. The power-grid safety corridor under Decree 14/2014/ND-CP sets minimum distances from overhead lines and substations by voltage class — the corridor most often met on peri-urban project land. The water-source protection corridor under Decree 43/2015/ND-CP embraces rivers and lakes serving domestic water supply. The road safety corridor under the Road Law 35/2024/QH15, railway corridors, the coastal protection corridor and defence and security works corridors complete the rest of the map.
The common trait of all corridors is that land inside them is not recovered and the land user keeps use rights for the established purpose, but is restricted from acts affecting the work’s safety: new construction, added floors, tall planting, excavation and filling, material stockpiling — the prohibited and restricted lists differ by corridor type and the specific distance to the work. The practical consequence is that the plot’s feasible building density is cut by the geometry of the corridor crossing it; a perfectly rectangular plot can lose a third of its effective building area to a 220 kV line crossing diagonally, and project value must be computed on what remains.
Restricted rights, compensation and support: not automatic like land recovery
Investors must distinguish three situations clearly. First, land already inside a corridor published before the investor received it: building limits are an objective condition travelling with the plot, generating no compensation — the purchase price must itself reflect the restricted value, which is why corridor land is usually priced well below its neighbours. Second, a corridor established or widened after the land use right formed, where the restriction reduces usability and value: under land law, the land user is considered for support per Government regulations and competent decisions — the mechanism is “considered support”, not automatic market-value compensation as in land recovery. Third, the State recovers corridor land to build or expand the work: that is ordinary land recovery with full compensation under the Land Law.
On certificates, areas encroaching safety corridors through unlawful construction are not certified and must be restored on demand; an investor acquiring a project with existing structures inside a corridor must appraise those structures’ legality too — a factory operating normally for years can still be a structure violating a power or dyke corridor, and the acquirer inherits the demolition-order risk rather than any “right to exist” from the violation’s long duration.
Corridor appraisal when buying project land: the closing procedure
Corridor appraisal layers four data sets over each other. The map layer: the plot’s cadastral extract overlaid with construction-planning maps and the sector corridor maps held by works management agencies. The document layer: written confirmations from the relevant works managers — the power company for grid corridors, dyke and irrigation managers for dykes and canals, transport authorities for road corridors — on whether the plot sits in a corridor and what the specific limits are. The field layer: measuring actual distances from plot boundary to the works, because digitised maps of old infrastructure often deviate from reality. The contract layer: the seller’s warranty on corridor status and allocation of consequences if a corridor confirmation surfaces after the transaction.
Appraisal timing decides its value: corridors must be settled before purchase pricing, because the entire project case depends on building area and height feasible after corridor deductions. For a project that already owns land and discovers a corridor overlap, practical handling options include redesigning to concentrate building mass outside the restricted range, negotiating with the works manager on technical solutions reducing the affected range within legal allowance, and recomputing project efficiency on the real building density — the right order is adaptive design first, and only when every design option breaks the efficiency case does land-price renegotiation with the seller under the signed warranty clause come into play.
Frequently Asked Questions
1. How are infrastructure safety corridors regulated?
Each work type has its corridor under sector law: irrigation-works protection corridors (Law on Irrigation 08/2017/QH14), dyke protection corridors (Law on Dykes), power-grid safety corridors by voltage class (Decree 14/2014/ND-CP), water-source protection corridors (Decree 43/2015/ND-CP), road safety corridors (Road Law 35/2024/QH15), coastal, railway and defence-works corridors. Land inside a corridor keeps its purpose of use but faces building limits per corridor type.
2. How is a project inside a corridor restricted in construction?
By corridor type: prohibition or restriction of new construction, height limits (especially under power-grid corridors and airport clearance), bans on excavation, filling, tall planting and material stockpiling near irrigation works and dykes. Corridor-violating portions are not certified and may face demolition and restoration orders. The plot’s feasible building density falls by the corridor area crossing it.
3. Is there compensation when land use rights are restricted by a corridor?
By situation: a corridor published before land receipt makes the limit a condition travelling with the plot, with no compensation. A corridor established or widened after the use right formed, reducing land usability, qualifies the land user for considered support under regulations — not automatic as in land-recovery compensation. If the State recovers the corridor land to build or expand the work, compensation follows ordinary land recovery.
4. What steps does corridor appraisal take when buying project land?
Overlay the cadastral map with corridor maps of works management agencies; obtain written confirmations from the relevant works managers (power, dykes, irrigation, transport) on the corridor range and specific limits over the plot; field-measure distances to the works; and put a corridor-status warranty into the sale contract. Appraisal must complete before purchase pricing because project efficiency is computed on the building area remaining after corridors.
This article has been quality-reviewed by the FLAW AI Legal Council