Legally filling land in compliance with the Excavation and Land Filling Act.

Land filling is a top priority for landowners planning to build a new home, as it establishes the foundation for the house's stability. However, the process is complex, involving legal regulations, the land's history, and the selection of contractors. Anyone planning to build a home should thoroughly understand these aspects before proceeding with land filling.

What is land filling?
Land filling involves adjusting the ground level and raising the elevation by adding soil or fill materials. This process prepares the surface for construction, helps prevent issues such as soil subsidence, waterlogging, and flooding, and strengthens the foundation before building begins.

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Legal considerations before filling land

Before building a home on your own land, it is essential to study the laws regarding land filling—a crucial step in the construction process. Failure to do so could result in damage to neighboring properties.

Land filling operations are governed by the *Excavation and Land Filling Act B.E. 2543 (2000)*. This Act applies to municipalities, the Bangkok Metropolitan Administration, Pattaya City, other local administrative organizations, areas subject to Royal Decrees on building control, and comprehensive planning zones under town planning laws. Since comprehensive planning zones have now been declared in every province, the Act is effectively applicable nationwide.

Additionally, specific areas may be subject to ministerial regulations, local ordinances, or other laws prohibiting excavation or land filling. Therefore, before undertaking any such work, it is vital to research the specific regulations applicable to that location.

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Details of Laws Regarding Soil Filling

1. Soil Excavation and Filling Act, B.E. 2543 (2000)

1.1 Soil excavation: Notification to the local official is required if the excavation depth exceeds 3 meters from ground level, the surface area of ​​the excavation pit exceeds 10,000 square meters (approximately 6 *rai* 1 *ngan*), or the depth or area meets the criteria specified in a local official's announcement.
The notification documents must include information such as a site plan of the excavation area; a plan showing land boundaries and adjacent properties; excavation methods and duration; operational details and safety measures for operators and third parties; soil collapse prevention measures; the name of the work supervisor; the notifier's office details; and any other documents required by the local official. Upon receipt of a correct and complete notification, the local official will issue a notification receipt within 7 days.
Even after receiving the notification receipt from the local official, the notifier is not absolved of liability for excavation activities that cause damage to personal property or the environment. The person performing the excavation—whether the landowner, the land possessor, an employee, or an agent—must provide compensation for such damages.
However, for excavations with a depth not exceeding 3 meters (which do not require notification to the local official), if the excavation takes place near another person's property boundary at a distance of less than twice the depth of the planned pit, measures to prevent soil collapse must still be implemented as reasonably required.

1.2 Soil filling: Notification is required if the height of the filled soil mound exceeds the ground level of adjacent properties owned by others, and the area exceeds 2,000 square meters (approximately 1 *rai* 1 *ngan*) or exceeds the area specified in a local official's announcement. In addition to notifying the local official, adequate drainage must be provided to prevent causing nuisance or trouble to neighboring landowners or other persons.
For land filling operations where the resulting mound height exceeds the level of adjacent land owned by others—and where the area is 2,000 square meters or less (or smaller than the threshold specified in a local official's announcement)—notification to the local official is not legally required; however, the operator must still ensure adequate drainage to avoid causing nuisance or trouble to neighboring landowners or other persons.

2. Ministerial Regulation Prescribing Measures to Prevent the Collapse of Soil or Structures During Soil Excavation or Filling Operations, B.E. 2548 (2005)
This Ministerial Regulation prescribes measures to prevent the collapse of soil or structures during soil excavation or filling operations, detailing the procedures for such activities to establish safety standards and work supervision requirements. For example:

2.1 Excavation work requiring notification to the local official must be accompanied by plans, supporting specifications, and calculation records prepared by a holder of a controlled engineering profession license (Civil Engineering branch), in accordance with conditions prescribed in the Ministerial Regulation.

2.2 For excavation exceeding 3 meters in depth from ground level or having an excavation opening area exceeding 10,000 square meters, the edge of the excavation must be set back from the boundary of another person's land or public land by a distance of at least twice the excavation depth (e.g., a 4-meter deep excavation requires a setback of at least 8 meters).
This requirement is waived if measures to prevent the collapse of soil or structures are implemented and certified by a holder of a controlled engineering profession license (Civil Engineering branch) pursuant to the law governing engineers.

2.3 For soil filling operations where the contiguous fill area exceeds 2,000 square meters and the fill height is 2 meters or more relative to the ground level of adjacent land owned by others,
plans, supporting specifications, and calculation records prepared by a holder of a controlled engineering profession license (Civil Engineering branch) are required, in accordance with conditions prescribed in the Ministerial Regulation.

2.4 For soil filling operations where the contiguous fill area exceeds 2,000 square meters and the fill height is 2 meters or more relative to the ground level of adjacent land owned by others, a work supervisor holding a controlled engineering profession license (Civil Engineering branch) must be appointed.

2.5 The base of the filled soil mound must be set back from the boundary of another person's land or public land by a distance of at least the height of the fill mound,
unless measures to prevent the collapse of soil or structures are implemented. ...certified by a holder of a professional license in controlled engineering (civil engineering branch) in accordance with the law governing engineers.

2.6 During and after the completion of soil excavation or filling operations, the excavator, the land filler, the landowner, or the land possessor (as the case may be) must inspect the stability of the excavation pit or soil mound and ensure its continued safety and structural integrity.

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**Penalties under Laws Governing Soil Filling**

Residents living adjacent to land where soil excavation or filling is taking place—who have suffered damage or have reasonable grounds to believe they might suffer damage due to operations that do not comply with the Soil Excavation and Filling Act—may request the local official to order a halt to such operations.

Furthermore, the Soil Excavation and Filling Act B.E. 2543 (2000) stipulates that in the event of an offense under this Act, the owner of real estate located near or adjacent to the land where the offense occurred—and who has suffered damage as a result of said offense—shall be considered an "injured person" under the law governing criminal procedure. This means the injured party may personally initiate criminal proceedings against the offender.

Examples of criminal penalties under the Soil Excavation and Filling Act B.E. 2543 (2000) include:
– Section 35: Soil excavation or filling performed without obtaining a notification receipt from the local official. ...is liable to imprisonment not exceeding one year, a fine not exceeding 50,000 baht, or both.
– Section 36: Excavating or filling land without complying with relevant ministerial regulations—such as the Ministerial Regulation Prescribing Measures to Prevent Soil or Structure Collapse During Excavation or Land Filling (B.E. 2548)—is punishable by a fine not exceeding 30,000 baht, plus a daily fine of up to 1,000 baht for the duration of non-compliance.

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Preventing Post-Filling Issues by Checking Land History

Once you understand the basic laws regarding land filling, the next step is to check the history of the land you are interested in or currently own. For prospective buyers, verifying the land's history is a crucial step.

However, even if you have owned the land for a long time, you should re-examine it before proceeding with filling or home construction. Time-related factors come into play when building on long-held land; your property may have previously been affected by issues such as flooding or soil erosion. Therefore, it is essential to re-familiarize yourself with the land before undertaking any filling work.

1. Check the history of flooding
The first step is to investigate the area's flood history by reviewing past news reports or consulting locals to determine the highest flood levels previously recorded. You should also check the water levels in public drainage systems by contacting the relevant government agencies. This information helps you estimate the necessary fill height—raising the land above these levels—to prevent flooding and ensure proper drainage from your property.

2. Check the elevation of neighboring plots and the road in front of the house
You should aim to raise the land level above that of the road in front of the house—typically by 50–80 centimeters—while keeping it comparable to the elevation of neighboring properties. Raising the land significantly higher than this is generally avoided because it creates an excessive slope between your property and the public road and could cause flooding issues for neighbors. Furthermore, raising the land by more than 80 centimeters entails high costs and creates lateral pressure that could damage your boundary fence.

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When filling land, don't forget to consider the soil type

You must clearly agree on the type of soil to be used for the fill. There are several types available, as follows:

1. General fill soil: This is the most popular choice due to its lower cost compared to other types. It is dense but lacks the fertility required for cultivation.
2. Hardpan soil (compacted clay/hard soil): Dry and highly compactable, this type is ideal for sites where immediate construction is planned, such as roadbeds or waterfront land.
3. Laterite soil: While it compacts well, it has low fertility and is unsuitable for cultivation.
4. Sandy soil: Although inexpensive, it does not retain water well and is prone to erosion. It requires proper compaction and measures to prevent soil runoff. To prevent future subsidence:
5. Topsoil is loose and porous with a relatively fine texture and good drainage; it is suitable for filling areas intended for gardens or lawns.

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Thanks to DD Property for the useful information.