Minor vs Complex Home Modifications
Minor vs complex home modifications compared: scope, structure, approval path, builder needs and everyday examples of each — in plain English.
Not all home modifications are treated the same way. The NDIS generally sorts them into two groups — minor and complex — and the difference shapes how long they take, who has to sign off, and how much assessment is involved. This guide lays the two side by side so you have a rough sense of where your changes might sit before you start.
The quick difference
Minor modifications
Complex modifications
Side by side: what actually changes
Where your changes might sit — and what's next
Frequently asked questions
Who decides if my modification is minor or complex?
It follows from your OT's assessment and the nature of the work. Non-structural changes are treated as minor; structural changes are complex. The NDIA considers the OT recommendation and quotes when deciding what to fund.
Do minor modifications still need an occupational therapist?
Yes. Home modifications are assessment-led whether minor or complex. The difference is the depth of assessment and evidence — minor work is assessed and quoted proportionately to its smaller scope.
Why do complex modifications often need two quotes?
Two quotes help show the cost is reasonable for structural work that can vary a lot between builders. It's a common expectation for larger, higher-cost modifications, alongside a building practitioner's involvement.
What is a building practitioner?
A registered building professional who can confirm structural work meets building standards and is done safely. Complex modifications usually involve one; minor, non-structural changes generally don't.
Can a lot of minor changes add up to a big improvement?
Absolutely. Grab rails, lever taps, non-slip flooring and better lighting together can make a home dramatically safer without any structural work at all.
Is a ramp minor or complex?
It depends. A small portable or threshold ramp is usually minor, while a permanent, structural ramp with landings and handrails is complex. Ramps and access modifications explains the range.