Last month, my client Kelvin was overjoyed to purchase a two-bedroom unit in Kowloon Bay, planning to combine the master bedroom and study into an open-plan master suite. Who would have thought, when the renovation contractor came to inspect, he told him: 'This wall is a structural wall, it cannot be removed!' Kelvin was stunned on the spot because he had already planned the entire renovation layout in his mind and had even ordered the furniture.
This story is not uncommon. In Hong Kong's property market, many first-time homebuyers encounter similar problems—failing to carefully study the floor plan before purchasing, only to realize after moving in that modifications to the layout are restricted, wasting both time and money. In fact, knowing how to identify 'structural walls' from a floor plan is an essential skill for every prospective homeowner. In today's article, I will explain in the simplest way how to determine from a floor plan which walls cannot be removed, helping you avoid detours when buying and renovating a home.
Core Concept: What is a Load-Bearing Wall? Why Can't It Be Removed?
Structural Wall vs Partition Wall: A Single Wall Difference, Far-Reaching Impact
In residential units in Hong Kong, walls are mainly divided into two categories: structural walls and partition walls.
Structural walls are the "skeleton" of a building, responsible for supporting the weight of the entire structure, including floors, ceilings, and the loads from upper units. These walls are usually made of reinforced concrete, with a thickness generally between 150mm and 250mm. Unauthorized removal of structural walls can seriously compromise a building's structural safety and may even lead to collapse.
Partition walls are non-load-bearing walls used to divide indoor spaces. They are usually made of lightweight bricks, gypsum boards, or wooden panels, with a thickness of about 75mm to 100mm. These walls can be modified according to the owner's needs without affecting the overall structure of the building.
:::warning Important Reminder: According to the Buildings Ordinance of Hong Kong, any alteration involving structural walls must be approved by an Authorized Person (AP) and submitted to the Buildings Department. Unauthorized changes to structural walls may not only require restoration but also result in hefty fines or even criminal prosecution. :::
Why are floor plans so important?
In the Hong Kong property market, the floor plan provided by developers is your primary source for understanding the layout of a unit. Although the floor plan does not directly indicate 'this is a structural wall,' through some visual clues and professional knowledge, you can roughly determine which walls are structural.
Mastering this skill can give you more confidence when viewing properties and help you avoid buying units with layouts that cannot be changed. For owners planning renovations, it also allows for advance planning, preventing the waste of time and money on designs that are not feasible.
Three Major Characteristics of Structural Walls
Before going into detail on how to identify structural walls from floor plans, first remember the three main characteristics of structural walls:
- Thicker: Load-bearing walls are usually thicker than partition walls and are represented with thicker lines on floor plans.
- Fixed Position: Load-bearing walls are mostly located on the exterior walls of a unit, the walls separating units, and the walls surrounding elevator shafts and stairwells.
- High Continuity: Load-bearing walls usually extend from the ground all the way up to the ceiling and maintain the same position across multiple floors of a building.
Practical Skills: How to Identify Structural Walls from Floor Plans?
Tip 1: Observe the Wall Thickness
This is the most direct method of judgment. On a floor plan, walls are represented with lines of different thicknesses. Generally speaking:
- Thick lines (about 2-3mm): represent structural walls, usually with a thickness of over 150mm.
- Thin lines (about 1mm): represent partition walls, with a thickness of about 75mm to 100mm.
:::tip Expert Tip: If the floor plan does not indicate wall thickness, you can request the real estate agent or developer to provide the 'Architectural Drawing,' which will clearly show the thickness and materials of each wall. :::
For example, suppose you are interested in a new property in Tseung Kwan O, and the floor plan shows a wall between the master bedroom and the living room. If this wall is represented by a thick line on the plan and its thickness is marked as 200mm, then it is likely a structural wall and cannot be removed. On the other hand, if the wall is only 100mm thick, it is considered a partition wall and can be considered for modification.
Tip 2: Pay Attention to the Wall Position
Structural walls are usually located in the following positions:
- Exterior Wall: The wall between the unit and the outside, which must be a structural wall.
- Partition Wall: The wall that separates your unit from the neighbor's unit, also a structural wall.
- Around Core Tube: The walls surrounding elevator shafts, stairwells, and garbage rooms belong to the building's core structure and absolutely cannot be removed.
- Near Column Positions: If the floor plan shows column positions (usually represented as squares or circles), the walls near the columns are likely structural walls.
:::highlight Insider Tips: In older buildings in Hong Kong (especially units from the 1980s or earlier), the positions of structural walls are relatively fixed, usually distributed along the perimeter of the unit and along the central axis. In new developments, due to the use of more advanced construction technologies, there may be fewer structural walls, but the exterior walls and partition walls remain non-movable. :::
Tip 3: Refer to the 'Approval Map' and 'Move-in Paper'
If you have already purchased a unit, or are considering buying a second-hand property, you can request the 'Approved Plan' and 'Occupation Permit' from the owner or real estate agent. These documents are issued by the Buildings Department and will clearly indicate the locations of the unit's structural walls.
On approval drawings, structural walls are usually represented by solid lines and labeled "RC Wall" (Reinforced Concrete Wall). Partition walls are represented by dashed or thinner lines and labeled "Partition Wall."
:::success Practical Advice: If you plan to make major changes to the layout, it is recommended to hire an Authorized Person (AP) or a surveyor to review the approved plans before signing a provisional sales and purchase agreement to confirm which walls can be removed. This cost usually ranges from HK$3,000 to HK$5,000, but it can help you avoid trouble in the future. :::
Tip 4: The 'Knock Test' During On-Site Inspections
If you already have the opportunity to inspect the unit, you can use the 'wall tapping test' to preliminarily determine the type of wall.
- Structural wall: When tapped, it produces a solid sound with almost no echo and feels hard to the touch.
- Partition wall: When tapped, it produces a more hollow sound with a noticeable echo and feels lighter to the touch.
However, this method can only serve as a preliminary reference; ultimately, it should be based on the approval plans and the opinions of professionals.
Common Mistakes and Risks: Three Major Traps You Must Know Before Making Interval Changes
Misconception One: 'Thin walls can definitely be demolished'
Many people think that as long as a wall is thinner, it can be removed at will. But that's not the case. In some old buildings, even walls with a thickness of only 100mm may be part of the load-bearing structure. In addition, some partition walls, although not structural, may contain water pipes, electrical wires, or gas pipes, which require extra handling during removal, and the cost may be higher than you expect.
:::warning Pitfall Avoidance Guide: Before demolishing a wall, be sure to hire a licensed plumber and electrician to check whether there are hidden pipes or wires inside the wall. If water pipes or electrical wires are found, rerouting work must be carried out first in order to safely remove the wall. :::
Misconception 2: 'The layout of a new property can always be changed'
Many first-time homebuyers think that the design of new apartments is more flexible and that the layout can be freely modified. However, in reality, even in new apartments, the exterior walls, partition walls, and walls around the core structure are still structural walls and cannot be removed. Moreover, some new apartments adopt a 'column-free design' to increase usable space, which means the walls bear greater loads, and the number of structural walls may actually be higher.
Misconception Three: 'The renovation worker says it can be removed, so just remove it'
Some homeowners overly trust the advice of renovation workers, thinking that if the worker says it can be demolished, then it is fine. However, renovation workers are not professional structural engineers, and their judgment may not be accurate. If a structural wall is removed without authorization, it can not only affect the safety of the building but may also result in orders from the Buildings Department to restore it, and even legal liability.
:::tip Professional Advice: Any project involving wall demolition should first consult a Authorized Person (AP) or a structural engineer. Although this will add a cost (approximately HK$5,000 to HK$10,000), it can ensure that the project is legal and compliant, avoiding future hassles. :::
Risk Warning: Consequences of Unauthorized Changes
According to Hong Kong's Buildings Ordinance, any structural changes made without approval are considered unauthorized building works. Once discovered by the Building Department, the property owner may face the following consequences:
- Order to Restore: The Buildings Department will issue a 'Demolition Order,' requiring the owner to restore the unit to its original condition within a specified period.
- Fines: Fines for illegally altering structural walls can be up to HK$400,000, and imprisonment for one year is also possible.
- Impact on Mortgages: If the unit has illegal building works, banks may refuse to approve a mortgage or require the owner to complete restoration works first.
- Impact on Resale: Illegal alterations can affect the market value of the unit, making it difficult to find buyers when reselling in the future.
Summary: Do your homework before buying a property, so you have no worries after renovation
In the Hong Kong property market, knowing how to identify structural walls from floor plans is an essential skill for every prospective and current homeowner. Whether you are a first-time buyer or an experienced homeowner planning to alter the layout, you should do your homework before starting work to avoid a series of problems caused by mistakenly demolishing structural walls.
Remember the following key points:
- Observe wall thickness: Thick lines represent structural walls, thin lines represent partition walls.
- Pay attention to wall locations: Exterior walls, partition walls, and walls around the core tube are usually structural walls.
- Refer to the approved plans: This is the most accurate basis for judgment; it is recommended to request for review before buying a property.
- Consult professionals: Any work involving wall demolition should first consult authorized personnel or structural engineers.
Buying a property is a major event in life, and renovation is an even more considerable expense. Instead of regretting it afterwards, it's better to do thorough homework beforehand to ensure that your property purchase and renovation plans go smoothly. Remember, while having mortgage payments lower than rent is important, living safely and legally is the long-term plan.
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