Disclaimer:
This article provides general information only and does not constitute financial, legal, tax, or investment advice. Property investment involves risk. Always do your own research and seek personalised advice from qualified professionals before making investment decisions.
Key Takeaways
- Due diligence can identify property, legal, tenancy, compliance and financial risks before an agreement becomes unconditional.
- Decide with your lawyer or conveyancer which LIM, title, council-file, inspection and specialist-report conditions the agreement needs.
- Test rental-income assumptions against documented market evidence and the property’s tenancy, condition and compliance position.
- Check each Healthy Homes standard, any specific exemption, the current compliance statement and property-specific remediation quotes.
- Investigate the area, not just the property.
Due diligence is the process of thoroughly investigating a property before you commit to buying it. For investment properties, this goes beyond checking the physical condition; you need to verify that the numbers stack up and that there are no hidden issues that could affect your returns or resale value.
Why Due Diligence Matters
An investment property is a significant financial commitment. Unlike buying a home where emotional factors play a role, investment decisions should be based on facts and figures. Proper due diligence helps you:
- Identify problems before they become your problems
- Negotiate a fair price based on the property's true condition
- Budget accurately for repairs and compliance costs
- Avoid properties with issues that could affect financing or insurance
- Make informed decisions rather than hopeful guesses
Document Checks
Essential Documents:
- ☐ LIM Report: Land Information Memorandum from the local council
- ☐ Title Search: Check ownership, easements, covenants, and encumbrances
- ☐ Building Consent Records: Verify all work was consented and signed off
- ☐ Code Compliance Certificates: For any building work
- ☐ Resource Consent Records: If applicable to the property
- ☐ Body Corporate Records: For units, including minutes, accounts, and long-term maintenance plan
- ☐ Current Tenancy Agreement: If the property is tenanted
- ☐ Rent Payment History: Verify rental income claims
Understanding the LIM Report
The LIM (Land Information Memorandum) is one of the most important documents you will obtain. It contains information the council holds about the property, including:
- Building and resource consent history
- Any known hazards (flooding, erosion, contamination)
- Rates information and any outstanding charges
- Zoning and district plan rules
- Any notices or requisitions affecting the property
LIM charges, processing times and urgent options are set by the relevant council. Check the current council service information and allow enough time in the agreement for review by your lawyer or conveyancer.
Physical Inspections
Inspection Checklist:
- ☐ Building Inspection: Comprehensive report from a qualified inspector
- ☐ Roof Inspection: Condition, remaining life, any repairs needed
- ☐ Subfloor Inspection: Moisture, piles, insulation
- ☐ Electrical Check: Wiring condition, switchboard, safety switches
- ☐ Plumbing Check: Pipes, water pressure, drainage
- ☐ Weathertightness Assessment: Especially for 1990s to 2000s builds
- ☐ Methamphetamine Test: Consider for properties with unknown history
- ☐ Asbestos Assessment: For pre-1990s properties
Building Inspection Deep Dive
Inspection fees and scope vary with the property and provider. Obtain a written scope and quote, check the inspector’s experience, qualifications, insurance and reporting limits, and ask whether specialist follow-up may be needed.
- Has relevant inspection experience and verifiable qualifications for the scope
- Has professional indemnity insurance
- Provides detailed written reports with photos
- Will explain their findings to you
Ask the inspector to distinguish observed defects, inaccessible areas, urgent safety issues, likely maintenance and matters needing specialist investigation. Obtain property-specific repair scopes and quotes before relying on cost or negotiation assumptions.
Healthy Homes Compliance
Rental properties must comply with the Healthy Homes standards unless a specific exemption applies. Check the evidence and current condition against each standard:
Healthy Homes Checklist:
- ☐ Heating: qualifying fixed heater(s) in the main living room meeting the calculated capacity requirement
- ☐ Insulation: applicable ceiling and underfloor evidence, R-value, thickness, condition and exemption tests
- ☐ Ventilation: qualifying openable windows and externally vented extractor fans in applicable kitchens and bathrooms
- ☐ Moisture and drainage: efficient drainage and, where required, an enclosed-subfloor ground moisture barrier
- ☐ Draught stopping: no unreasonable gaps or holes that cause noticeable draughts, and applicable unused fireplaces blocked
If compliance is uncertain, obtain a property-specific assessment and written scopes and quotes. Do not assume an exemption, required work or cost from a generic checklist.
Financial Due Diligence
Financial Checks:
- ☐ Rental Appraisal: Get independent estimates from 2-3 property managers
- ☐ Comparable Sales: Research recent sales of similar properties
- ☐ Rates: Verify current rates and any planned increases
- ☐ Insurance: Get quotes for landlord insurance
- ☐ Body Corporate Fees: Current fees and any planned increases
- ☐ Yield Calculation: Calculate gross and net rental yield
- ☐ Cash Flow Analysis: Will it be positively or negatively geared?
Treat the current rent, agent estimates and independent appraisals as inputs rather than guarantees. Record each source, date, comparable-property basis, tenancy restrictions, expected costs and the assumptions used in your cash-flow model.
Location and Market Research
Area Research:
- ☐ Vacancy Rates: Check rental vacancy rates for the area
- ☐ Tenant Demand: What type of tenants are looking in this area?
- ☐ Future Development: Check district plan for zoning changes or developments
- ☐ Infrastructure: Planned roads, public transport, or amenities
- ☐ Employment: Local employment opportunities and trends
- ☐ Schools: Quality of local schools (affects family tenant demand)
- ☐ Crime Statistics: Check NZ Police crime maps
- ☐ Flood Maps: Check council flood hazard maps
Visit the property at different times of day and week. A quiet street during a weekday viewing might be a nightmare on Friday nights. Talk to neighbours if possible; they often know things that will not show up in any report.
Insurance Considerations
Before going unconditional, confirm you can get appropriate insurance. Some properties are difficult or expensive to insure due to:
- Flood or erosion risk
- Earthquake-prone building status
- Construction type (e.g., monolithic cladding)
- Claims history
- Location (e.g., Wellington earthquake risk)
Get insurance quotes before your due diligence period ends. If insurance is unavailable or prohibitively expensive, this should factor into your decision.
Existing Tenancy Checks
If the property has existing tenants, additional due diligence is required:
Tenancy Checks:
- ☐ Review current tenancy agreement terms
- ☐ Verify rent amount and payment history
- ☐ Check bond lodgement with Tenancy Services
- ☐ Review recent property inspection reports
- ☐ Understand any verbal agreements or arrangements
- ☐ Confirm the Healthy Homes compliance statement has been provided
A sale does not by itself erase an existing tenancy. Have your lawyer or conveyancer confirm the agreement, settlement arrangements and landlord change; verify rent, bond, notices, inspections, Healthy Homes records and other written arrangements, and check the current legal rules before assuming rent can change.
Red Flags to Watch For
Warning Signs:
- Unconsented building work
- Monolithic cladding (1990s to early 2000s builds)
- Signs of water damage or mould
- Structural cracks or movement
- Properties sold "as is where is"
- Reluctance to allow inspections
- Significant body corporate issues or upcoming levies
- High tenant turnover or current vacancy
- Nearby developments that could affect value or rental demand
Making Your Decision
After completing your due diligence, you should have a clear picture of:
- The property's condition and any required repairs
- Realistic rental income expectations
- Ongoing costs including rates, insurance, and maintenance
- Any compliance work needed
- Potential risks and how to mitigate them
Use the evidence with your lawyer or conveyancer, lender, insurer and any appropriately regulated adviser to assess the agreement conditions, total costs, risks and financial assumptions. Available remedies or withdrawal rights depend on the signed agreement and the facts.