Renovating a home doesn't always mean renovating the entire house. You might choose to renovate only specific areas or rooms that need improvement. In practice, there are specific considerations that homeowners should understand before planning the renovation.

When renovating or improving different parts of the house, the suitability of the structure, the ease of installation, and the feasibility of removing or installing materials must be considered. Each part, whether it's the roof, walls, ceilings, floors (both inside and outside), bathrooms, or systems, has different details to consider.
 
Renovating the Roof
       You might improve the roof for aesthetic reasons, to solve problems, or both. In the case of a detached house, you have more freedom in decision-making. However, if it’s a semi-detached or townhouse that shares a roof with neighbors, you must consider the limitations of how much you can renovate. For typical houses, changing roof tiles from the original model requires consideration of the rafter spacing and the appropriate pitch for the new tiles, as well as ensuring that the weight of the new tiles is equal to or lighter than the original materials to avoid adding extra load to the existing structure. Each time you renovate the roof is also a good opportunity to check the roof structure for its condition and any signs of decay that need repair.

Image: Rafter spacing is a consideration when changing roof tile models.

Renovating the Ceiling
       Renovating the ceiling by removing the old one and replacing it with a new, more beautiful one, including changing the type and style of the ceiling, should consider the integrity of the framework that meets standards and is suitable for the ceiling style. If you want to remove the ceiling to expose the floor joists, you should consider organizing the electrical wires and plumbing pipes hidden above the old ceiling, and you may need to decorate and repair the exposed floor for aesthetic purposes. If the upper floor is wooden and laid on joists, removing the ceiling will increase the noise transfer between floors through the gaps between the wooden floorboards.

Image: Exposed ceiling in a loft style, where the electrical wiring must be organized neatly.

Renovating the Walls
       Wall renovations can range from changing the surface materials, which must consider the limitations of installing new materials onto the existing walls (for example, you cannot tile over gypsum walls). Additionally, demolition, drilling, or tearing down walls can only be done with non-structural walls (load-bearing walls such as concrete walls or precast walls cannot be altered). There are also additional considerations regarding embedded systems or conduits along the walls, relevant laws (for example, when creating a window in a solid wall, you should consider the distance between the window and the property line according to building regulations), and the potential impacts on other areas, such as when tearing down a brick wall, you will need to finish the flooring and ceiling materials where the wall used to be.

Image: Drilling a hole in a plastered brick wall to create a door or window.

Renovating Doors and Windows
       When it comes to renovating doors and windows, if you are changing the frames, there are additional considerations. For example, removing wooden frames from concrete walls can cause significant damage if not done by a skilled worker. When installing vinyl or aluminum frames, focus on ensuring that the wall is level and that the joints between the frame and the wall are sealed tightly. If you want to change a hinged window to a sliding one, you must accept that the size of the opening for airflow will be reduced by half.

Image: Comparison of airflow between a hinged window and a sliding window.

Renovating the Floors Inside the House
       For floor renovations, if you are changing the surface materials, it generally does not affect the structure. However, you should consider whether you can install new materials over the old ones (for example, laying vinyl tiles, carpets, or laminate flooring over existing tiles) or if you should remove the old materials first before installing the new ones (for example, you should remove damaged tiles before laying new ones). In addition to changing the surface materials, every floor renovation must be careful not to impact the existing structure. For instance, if you want to raise the floor level by more than 10 cm, you should not pour concrete over it as it will add excessive weight. If you want to change the existing pre-cast floor to a cast-in-place concrete floor, you should consult an engineer about the feasibility, as the structural systems of both types differ.

Image: If raising the floor in the house by more than 10 cm, do not pour concrete over the existing floor; instead, use a lightweight floor system.

Renovating the Bathroom
       When renovating a bathroom, especially when relocating or changing fixtures, you must consider the plumbing system, including the supply and drainage points. For bathroom floor renovations aimed at elderly users, you should also consider making the floor level. For bathroom renovations that do not affect the plumbing system, such as merely changing floor/wall tiles, you might also consider installing a new waterproofing system to prevent long-term leakage issues.

Image: Installing a drainage channel instead of creating a sloped floor in a bathroom for the elderly.

Renovating Systems
       System renovations may sometimes result from renovations in other parts of the house, such as demolishing walls that have various pipes embedded, requiring repositioning of the pipes. Additionally, you may need to install lighting systems for newly partitioned rooms. For major renovations involving multiple areas, it’s a good opportunity to consider upgrading the systems, especially in homes that are 15-20 years old. It is recommended to update the electrical system for safety. Regarding plumbing, if you notice issues such as leaks at various points or rusty water from steel pipes, you should investigate the cause and repair it properly.

Renovating Outdoor Areas
       Since outdoor areas often have various structural options, from different types of piling to concrete slabs on beams or on the ground, or laying materials directly on the ground without a supporting structure (such as grass/artificial grass or concrete blocks), when renovating outdoor areas, you should consider the intended use (for example, improving it for parking, walkways, or seating areas) alongside the condition of the existing ground and the design of the area to ensure satisfaction and value for your usage.

Image: Common types of piles used for outdoor flooring.

Image: Concrete blocks or pavers can be laid directly on the ground without a supporting structure.

       From all the examples provided, it is clear that each part of the home renovation has specific considerations that homeowners should research further. Sometimes, it may also be an opportunity to make additional improvements. For instance, if the roof structure is sagging and needs to be rebuilt, it could be a chance to change the roof shape and install a Cool Roof System to reduce heat in the house. Or if you are partitioning a new bedroom for grandparents, you might also consider renovating the bathroom to suit the needs of elderly users.

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