How Not to Lose Money on a Building Extension
You need more space. A bigger kitchen. An extra bedroom. A home office. So you decide to build an extension.
Good idea. A well-built extension adds value to your home. A badly built extension costs you money.
I am a builder. I have seen people lose hundreds of thousands of rand on simple extensions because they made basic mistakes. Let me show you how to avoid that.
Mistake 1: No plan
You know what you want. You describe it to the builder. He nods. He starts building.
Halfway through, you realise the room is too small. The window is in the wrong place. The roofline does not match the house.
Now you are paying to change things that should have been planned from the start.
Cost of this mistake: R20,000 to R50,000 in changes and delays.
What to do instead: Get proper drawings. Even a simple extension needs a sketch with measurements. Agree on everything before the first brick is laid. Do not trust verbal agreements.
Mistake 2: Ignoring the foundation
You want to save money. You tell the builder to use a cheaper foundation. He warns you. You insist.
Six months later, the walls crack. The door does not close properly. The floor slopes.
Cost of this mistake: R40,000 to R80,000 to demolish and redo the foundation.
What to do instead: Build the foundation properly the first time. Do not cut corners on what is underneath. You cannot see it, but your house will feel it.
Mistake 3: Extending without checking the roof
You extend the ground floor. You forget about the roof above.
Now the water from the main roof flows onto your new extension. The gutter overflows. Water seeps into the wall. The paint peels. Damp appears.
Cost of this mistake: R15,000 to R30,000 for new gutters, downpipes, and waterproofing.
What to do instead: Before you build, look at the roof. Where does the water go? How will the extension affect the flow? Plan your gutters and drainage before you pour concrete.
Mistake 4: Hiring a friend who knows someone
Your cousin has a friend. That friend built a garage once. He says he can do your extension for half the price.
He starts. He works slowly. The quality is poor. He disappears when you ask for a refund. You call me. I tell you the work is not up to standard. You pay me to demolish and start again.
Cost of this mistake: Double the cost. You pay the cheap guy and then you pay a professional to fix it.
What to do instead: Hire a registered builder. Check references. Look at previous work. Pay a fair price. Cheap builders are expensive in the long run.
Mistake 5: Changing your mind halfway
You approve the plan. The builder starts. Three weeks in, you decide you want a different window. A bigger door. The tiles should be a different colour.
Every change costs money. Every change delays the project. Every change frustrates the builder.
Cost of this mistake: R5,000 to R20,000 in variation costs plus extended project time.
What to do instead: Make all your decisions before the project starts. Take your time choosing finishes, windows, doors, tiles, paint. Once the builder starts, do not change things unless absolutely necessary.
Mistake 6: No contract
You shake hands. You trust the builder. He is a nice guy.
Then he asks for more money. Then he does not show up for a week. Then he tells you the price has gone up because materials cost more.
You have nothing in writing. You cannot prove what he promised.
Cost of this mistake: R10,000 to R50,000 in disputes, legal fees, or paying another builder to finish.
What to do instead: Get a signed contract. Include the scope of work, materials, payment schedule, timeline, and penalties for delays. Even a simple one-page agreement is better than nothing.
Mistake 7: Forgetting about council approval
You think your extension is small. You think you do not need approval. You build anyway.
The council finds out. They issue a fine. They tell you to demolish or apply for approval after the fact. Both options cost you time and money.
Cost of this mistake: R10,000 fine plus R15,000 to R30,000 for retrospective plans and approval.
What to do instead: Check with your local municipality before you build. Find out if you need plans approved. Do it properly. The paperwork is cheaper than the fine.
How to do it right
Here is what a smart homeowner does.
One, get proper drawings. Know exactly what you are building.
Two, build a proper foundation. Do not cut corners.
Three, plan your roof and drainage before you start.
Four, hire a registered builder with references. Pay a fair price.
Five, make all your decisions before the project starts.
Six, sign a contract. Protect yourself.
Seven, check council requirements before you build.
What a smart homeowner spends upfront
Drawings cost is R100 to R150 per square metre depending on area. That saves you between R20,000 and R50,000 in changes and delays.
A proper foundation costs R1000 to R1500 for a Strip Foundation And R1800 To R2800 for a Raft Foundation.
A roof and drainage plan costs R2,000 to R5,000. That saves you R15,000 to R30,000 in water damage.
A registered builder costs 10 to 20 percent more. That saves you R50,000 to R150,000 in rework.
A signed contract costs nothing. That saves you R10,000 to R50,000 in disputes.
Council approval costs R2,000 to R5,000. That saves you a R25,000 fine plus demolition costs.
Add it up. A few thousand rand upfront saves you hundreds of thousands later.
Want to extend your home?
If you are planning a building extension in Pretoria, Centurion, or Midrand, give me a call. I will look at your space, give you honest advice, and quote you a fair price.
No hard sell. No cutting corners. Just good building.
Clayton Mahlangu
Morapedi Projects and Construction
012 055 8667 / 0768913667
www.morapediconstruction.co.za