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How to Research a Property Before Buying in NSW: The 12 Checks
Most of the research a buyer's agent charges for is public data you can pull yourself in an afternoon. Here are the 12 checks for a NSW address, where each one comes from, what it costs, and the order that saves you money.
When people ask an AI assistant "how do I research a house before buying", the honest answer is a list of websites: the planning portal, the council, the land registry, the portals, the flood and bushfire maps. All of it is public. The problem has never been access; it is knowing which 12 things to check, in which order, and what each one means for the price you offer.
This is that list for New South Wales. Nine of the twelve checks are free. Two cost money because they need a person on site or a lawyer reading a contract. One costs a small fee for a government record. If you want the whole set for one address in a single place, a knest free property report runs the data checks for you; the point of this guide is that you understand what you are looking at either way.
- Check the address, not the suburb. Flood, bushfire, heritage, zoning and noise all change between neighbouring lots.
- Do the free data checks before you pay for anything. Half of all "deal-breakers" show up in the planning certificate, the flood map or the comparable sales, and they cost nothing to find.
- Read the Section 10.7 planning certificate in the contract first. It is the single document that lists most of the planning and hazard controls on the land.
- Pay for a building and pest inspection and a contract review only on a home that has passed the data checks.
- Price last. Once you know the risks, compare the asking price with what similar homes on the same street actually sold for.
The order matters
Buyers usually research in the wrong order: fall for the house, book the inspection, then discover the flood overlay. Reverse it. Run the free checks first, drop anything that fails, and spend money only on homes that survive.
- Contract and 10.7 certificate. Ask the agent for the contract before the first open home. The planning certificate inside it covers zoning, flood controls, bushfire-prone status, heritage and more in two pages.
- Free data checks. Price and comparable sales, flood, bushfire, zoning, heritage, noise, power lines, land and suburb trend. An afternoon, or a few minutes with a report.
- Title and strata. A title search for easements and covenants; a strata report if it is an apartment.
- Inspection and contract review. The two paid checks, on a shortlist of one or two.
- Price. Now set your number against the comparables, adjusted for what you found.
1. What it is worth
Start with recent sales of comparable homes: same suburb, similar land size, bedrooms and condition, sold in the last six to twelve months, and ideally on the same street. The portals list sold prices; the NSW Valuer General publishes land values by address; a knest report shows an independent price estimate with the comparable sales it was built from, so you can see the reasoning rather than a number. Treat any estimate, including ours, as a starting point to argue with, not an answer.
What to watch: the agent's guide is a marketing number, and a "price withheld" sale tells you nothing. If the comparables are all newer, bigger or on quieter streets than the home you are looking at, adjust down.
2. Flood
Flood is the one risk a listing will not raise and an inspection cannot see. In NSW the Section 10.7 certificate states whether the land is subject to flood related development controls, which usually means it sits inside the council's flood planning area (the 1% annual exceedance probability flood level plus a freeboard, commonly 0.5 metres). Your council's flood map or flood study gives the detail, and the NSW SES Flood Data Portal publishes many of those studies.
Then get an insurance quote on the exact address. The premium is the market's own flood assessment, and a refusal is a deal-breaker you want to find before exchange. The full method is in how to check flood risk by address in NSW and buying in a flood-prone area.
3. Bushfire
The NSW Rural Fire Service maps bush fire prone land, and the 10.7 certificate says whether the lot is on it. Being bushfire-prone does not stop you buying, but it changes two things: insurance cost, and the construction standard for any new building or major renovation, set by a Bushfire Attack Level assessment. BAL ratings explained covers what each level means for cost.
4. Zoning and planning controls
The NSW Planning Portal Spatial Viewer shows the zone (R2 Low Density Residential, R3 Medium Density and so on), height and floor space limits, minimum lot size and the other controls from the council's Local Environmental Plan. The 10.7 certificate repeats the zone and lists the planning instruments that apply.
Two questions to answer: can you do what you plan to do with the property (extend, build a granny flat, subdivide, run a business), and what can be built around you. For the second, search the council's DA tracker for the street and the neighbouring lots. A three-storey approval next door is public information months before the hoarding goes up.
5. Heritage
Heritage listing or a heritage conservation area limits what you can change on the outside of the building and sometimes inside. Check the heritage schedule of the Local Environmental Plan (on the Planning Portal), the State Heritage Register, and the 10.7 certificate, which flags heritage items. The constraint is real but so is the protection: conservation areas tend to keep their streetscape.
6. Title: easements, covenants and caveats
The contract includes the title search and the registered dealings. Look for easements (a right for someone else, often a utility or a neighbour, to use part of the land), restrictive covenants (rules about what you can build or do), and caveats (a third-party interest that needs to clear before settlement). An 88B instrument attached to the plan is where many of these live. If you want your own copy, a title search through a NSW Land Registry Services information broker costs a small fee. What is an easement explains the common types.
7. Noise: road, rail and aircraft
You will hear it at the open home only if the open home is at the wrong time. Check distance to arterial roads, rail lines and flight paths. Sydney Airport publishes ANEF noise contours; a knest report shows the road and rail noise layer for the address. A quiet Saturday inspection of a house 80 metres from a freight line is not a test.
8. Power lines and infrastructure
Overhead transmission lines, substations and major pipelines affect value and sometimes what you can build underneath them. They are visible on aerial imagery and on the report's power line layer; walk the street and look up.
9. Strata (apartments and townhouses)
If the property is strata-titled, order a strata report before you commit. It covers the levies, the capital works fund balance, special levies, building defects, insurance, by-laws and the minutes of recent meetings, which is where disputes and looming repairs show up. It costs money, but a thin capital works fund on a building with a failing membrane costs far more.
10. Building and pest inspection
The one check that needs a person on site. Book it on a home that has passed everything above, and before auction, because an auction purchase is unconditional. Read the report for structural movement, water entry, termite activity and the age of the roof, wiring and plumbing, then price the repairs into your offer. The house inspection checklist lists what to look for yourself first.
11. Land: slope, orientation, size and frontage
Slope affects drainage, building cost and whether the backyard is usable. Orientation decides winter sun and summer heat; house orientation in Australia covers the trade-offs. Lot size and frontage decide what can be built, now and when you sell. All of it is measurable from the plan and the 3D land view in a report before you visit.
12. The suburb's direction
Finally, the context: median price trend, sales volume, days on market, the development pipeline and who is buying. A suburb with rising volume and falling days on market is a different negotiation from one with the opposite. Each knest suburb page shows the trend and every street in it; the Sydney suburbs by region index is the quickest way in.
What each check costs
| Check | Source | Cost |
|---|---|---|
| Price and comparables | Portals, Valuer General, knest report | Free |
| Flood | 10.7 certificate, council flood map, SES portal, knest report | Free (council flood certificate: fee) |
| Bushfire | NSW RFS map, 10.7 certificate, knest report | Free |
| Zoning and planning | Planning Portal, 10.7 certificate, council DA tracker | Free |
| Heritage | LEP schedule, State Heritage Register, 10.7 certificate | Free |
| Title | Contract title search; NSW LRS broker for your own copy | Small fee |
| Noise | Sydney Airport ANEF contours, knest noise layer | Free |
| Power lines | Aerial imagery, knest report | Free |
| Strata report | Strata inspector | Paid |
| Building and pest | Licensed inspector | Paid |
| Land and orientation | Plan, 3D land view in report | Free |
| Suburb trend | knest suburb page | Free |
A full-service buyer's agent does this research and then finds, negotiates and bids for you, for an industry-average 2% to 3% of the purchase price plus GST. Whether that is worth paying depends almost entirely on the second half of the job; what a buyer's agent costs in Sydney sets out the numbers.
Frequently asked questions
How do I research a house before buying in NSW?
Get the contract and read the Section 10.7 planning certificate, then run the free data checks: comparable sales, flood, bushfire, zoning, heritage, noise, power lines, land and suburb trend. Order a title search and, for an apartment, a strata report. Pay for a building and pest inspection and a contract review only on a home that has passed the rest. Then set your price against the comparables.
What is a Section 10.7 planning certificate?
A certificate issued by the council under section 10.7 of the Environmental Planning and Assessment Act 1979. It must be attached to every NSW residential contract for sale and lists the zoning, the planning instruments that apply, and whether the land is affected by flood related development controls, bushfire-prone land mapping, heritage listing and other matters.
What is the most important check before buying a house?
Flood, because it is the one risk that can make a home uninsurable and it is invisible at an inspection. After that, the title documents and the building inspection. Everything else changes the price; those three can change whether you should buy at all.
Can I do my own property due diligence without a buyer's agent?
Yes, for the research. Price, comparable sales, flood, bushfire, zoning, heritage, title, noise and power lines are all public records or free reports. What you cannot replace cheaply is the inspection and the legal review, and what you may not want to do yourself is the negotiation or the auction bidding.
How much does it cost to research a property?
Most of it is free. A council flood information certificate and a title search each cost a small fee. A strata report and a building and pest inspection are the two real costs, typically several hundred dollars each, and you only order them on a shortlist.
What does a knest free property report include?
An independent price estimate with comparable sales, flood and bushfire exposure, heritage listing, zoning and planning controls, power lines, road and rail noise, land detail including a 3D view, suburb data, and an AI agent that answers questions about the property. It covers residential addresses across NSW.
Sources
- NSW Planning Portal, Spatial Viewer and planning certificates: https://www.planningportal.nsw.gov.au/
- Environmental Planning and Assessment Act 1979 (NSW), section 10.7, and Environmental Planning and Assessment Regulation 2021, Schedule 2
- NSW Land Registry Services, title searches and information brokers: https://www.nswlrs.com.au/
- NSW SES Flood Data Portal: https://flooddata.ses.nsw.gov.au/
- NSW Rural Fire Service, Bush Fire Prone Land map: https://www.rfs.nsw.gov.au/plan-and-prepare/building-in-a-bush-fire-area/planning-for-bush-fire-protection/bush-fire-prone-land
- NSW Valuer General, land values: https://www.valuergeneral.nsw.gov.au/
- NSW Fair Trading, buying a property: https://www.fairtrading.nsw.gov.au/housing-and-property/buying-and-selling-property/buying-a-property
- Real Estate Buyers Agents Association of Australia, fee guidance: https://rebaa.com.au/
- knest.ai data sources: https://www.knest.ai/data-sources
Daniel Ryan, knest.ai
General information for NSW buyers, current at 8 October 2026. Not legal, financial or tax advice. Confirm anything you rely on with the council, your conveyancer and your own inspections.
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