How Much Does a Home Extension Cost? What Homeowners Should Know Before Choosing a Contractor
- songyod thomtitchong
- Jun 12
- 3 min read
One of the most common questions homeowners ask before starting a renovation or extension project is:
“How much will it cost?”
While it may seem like a simple question, the reality is that there is no single answer. Home extensions are not standardized products. Every project is different because every homeowner has different goals, expectations, budgets, and priorities.
The most important question is not simply how much it costs.
The better question is:
"What value will I receive from that investment?"
The Same Size Extension Can Have Very Different Costs
Two homeowners may plan to extend the same amount of space, yet their budgets can be completely different.
One homeowner may be looking for a practical and affordable solution. Another may want higher-quality materials, premium finishes, custom cabinetry, better lighting, and long-term durability.
For example, a homeowner may initially select standard 60x60 cm floor tiles. After seeing design references, showrooms, or completed projects, they may decide they prefer large-format 60x120 cm tiles or premium materials.
The size of the room remains the same, but the installation method, labor requirements, and material costs may change significantly.
This is why experienced professionals rarely provide an exact construction cost before understanding the project requirements in detail.https://www.saladecor.com/home-extension-in-phnom-penh
Cost Per Square Meter Is Only a Starting Point
Many homeowners use cost-per-square-meter estimates to understand renovation budgets.
While this can provide a useful starting point, it should never be treated as a final cost.
Actual construction costs depend on many factors, including:
Structural work
Foundation requirements
Electrical systems
Plumbing systems
Interior finishes
Material quality
Site conditions
Design complexity
Because of these variables, two projects with the same floor area can have very different final costs.https://www.saladecor.com/home-extension-in-phnom-penh
What You Cannot See Is Often More Important Than What You Can
Most homeowners naturally focus on visible elements such as:
Paint colors
Flooring
Furniture
Cabinetry
Decorative finishes
However, the quality of a home is often determined by elements hidden behind walls and ceilings.
These include:
Electrical systems
Grounding systems
Circuit separation
Plumbing systems
Waterproofing
Tile installation methods
Structural reinforcement
During renovation projects, we often encounter homes where electrical systems have been modified multiple times without proper planning.
In some cases, lighting circuits and power outlets are connected together. In others, electrical loads were never recalculated after adding air conditioners, water heaters, or new appliances.
These problems may not be visible during handover, but they can create maintenance challenges, safety risks, and unexpected expenses in the future.https://www.saladecor.com/home-extension-in-phnom-penh
Why the Lowest Price Is Not Always the Best Value
Every homeowner wants to manage their budget wisely.
However, choosing a contractor based solely on the lowest quotation can sometimes create larger expenses later.
In our experience, we are often invited to inspect homes after problems have already appeared.
Common issues include:
Loose tiles
Cracked finishes
Poor workmanship
Swollen cabinetry
Electrical problems
Premature deterioration
Many of these issues are not caused by materials alone.
They are often the result of rushed installation, insufficient preparation, or shortcuts taken during construction.
A lower initial price may seem attractive, but repairs and corrections can become far more expensive than doing the work correctly from the beginning.https://www.saladecor.com/home-extension-in-phnom-penh
Site Conditions Have a Major Impact on Cost
Construction is not only about materials and labor.
Site conditions also affect project costs.
For example:
High-rise condominium renovations
Limited working hours
Restricted elevator access
Difficult material deliveries
Narrow access roads
Noise restrictions
Special waste disposal requirements
These factors increase labor time, logistics costs, and project complexity.
Two projects with identical designs may require very different budgets because the site conditions are different.https://www.saladecor.com/home-extension-in-phnom-penh
Why Design Should Come Before Pricing
The most accurate way to estimate a renovation budget is to begin with proper planning and design.
Once a design is completed, professionals can:
Calculate material quantities
Estimate labor requirements
Plan construction schedules
Prepare accurate quotations
Without drawings and project details, any cost estimate should be considered preliminary only.
Budget for the Unexpected
Even with careful planning, homeowners should consider setting aside a contingency budget of approximately 10–20%.
This reserve can help cover:
Hidden site conditions
Design modifications
Additional work requests
Material upgrades
Unexpected construction challenges
A contingency budget helps reduce stress and allows projects to move forward more smoothly.
A Better Home Is More Than Just a Lower Price
At SALA DECOR, we believe that a successful renovation is not simply about spending less money.
It is about creating a home that is safer, more comfortable, more functional, and more valuable over the long term.
Our goal is to help homeowners understand their options, make informed decisions, and invest in solutions that improve everyday living.
Because a home is more than a construction project.
It is an investment in quality of life.
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