A Guide for Homeowners Considering Underpinning
For many homeowners, discovering cracks in walls or uneven floors is stressful enough. The next worry is usually this: “If I underpin the house, will it hurt the value when I sell?”
The short answer is no. When underpinning is done properly, engineered, and fully permitted, it often protects or even improves the value of your home. In fact, most buyers feel far more confident knowing the foundation issues were professionally repaired rather than ignored.
Below we break down the common questions buyers ask, so you can understand how underpinning affects future resale and why doing it by the book matters.
This guide explains what causes foundation problems, the typical costs and timeframes, and what you should expect when hiring a qualified foundation repair specialist.
Would you buy a house that has been underpinned?
Most buyers are comfortable purchasing a home that has been underpinned as long as the work was done correctly. What they want to see is:
- An engineer’s design
- A building permit
- Inspection records
- A completion certificate
- A reputable underpinning company with a long history
- Warranty insurance certificate (if job exceeded $16,000).
This documentation shows the home hasn’t just been patched. It’s been repaired properly, inspected, and legally recorded. For many buyers, this gives more confidence than a house showing cracks but no repairs.
When underpinning is done safely and legally, buyers don’t see it as a negative. They see it as a foundation issue that has been resolved.
Does underpinning devalue property in Australia?
Unpermitted repairs and quick fixes can devalue a property. Proper underpinning does not.
You’re doing the exact thing a building inspector wants to see. You’ve followed the legal process, used an engineer, obtained a permit, and had the work independently inspected. That puts you ahead of the many homes that hide movement issues or use short term methods.
The work is on record, approved, and brings the home in line with standards. That protects your property value and removes uncertainty for future buyers.
Is it hard to sell a house that has been underpinned?
Selling becomes difficult only when:
- There’s no engineer’s design
- No permit was issued
- No inspections were carried out
- The method used wasn’t compliant (common with resin injection)
Real estate agents and buyers will almost always ask for documentation. If everything is in order, the sale usually goes smoothly. If the work isn’t documented, the buyer will worry about future liability, and the sale can fall apart.
This is why we never cut corners. Engineer-certified, permitted underpinning eliminates uncertainty.
Can you get a mortgage on a house that’s been underpinned?
Yes. In fact, banks prefer homes where foundation issues have been professionally repaired with permits.
Mortgage assessors simply want proof that:
- There was a structural issue
- It was repaired
- It was repaired legally
- It meets engineering standards
If those boxes are ticked, lenders rarely have a problem. It’s unpermitted work that raises red flags.
Do I have to declare underpinning when selling?
Yes, and this is a good thing.
Section 32 requires disclosure of building works. If you’ve obtained a building permit for underpinning, this gets included. Buyers appreciate this transparency because it shows the work was done properly.
Declaring underpinning done with permits is a selling point. It tells buyers:
- The home had movement
- You fixed it correctly
- It has engineering backing
- It is recorded with council
- There’s nothing hidden
Contrast that with resin injection, which often goes undeclared because permits aren’t required. Buyers who discover this later can lose confidence, and sales become difficult.
What is a red flag when buying a house?
The real red flags aren’t underpinning at all. They include:
- Cracks with no explanation
- Foundation repairs done without permits
- Resin injection used as a substitute for structural work
- No engineering documentation
- No completion certificates
- Recent cosmetic patching that hides deeper issues
Buyers worry most when the history is unknown. Documented underpinning with permits removes that fear.
The takeaway for homeowners thinking about underpinning
If you’re considering underpinning, remember this:
The way you do it matters.
Proper, engineer-designed, permitted underpinning will:
- Protect the value of your home
- Make future sale easier
- Give buyers confidence
- Give lenders confidence
- Provide proof the issue was resolved properly
Shortcuts like resin injection may seem simple, but they don’t come with the oversight, engineering, or compliance required to give future buyers peace of mind. They also can’t be declared as a structural repair because they aren’t one.
If you want the repair done once, done right, and fully compliant for resale, traditional underpinning backed by a building permit is still the standard.
At Fred R. Heimann Co. Pty. Ltd., we’ve been repairing foundations across Melbourne and Geelong for over 40 years. Our underpinning is engineer-designed, fully permitted, and built to last – with the appropriate warranty insurance arranged for qualifying jobs.
📞 Call Steve on 0407 055 020 or contact us to arrange your free, no-obligation quote today.