Home Modifications: Why Occupational Therapy Matters
Home modifications support safe and independent living. Within the NDIS, they are generally described as simple adaptations or complex home modifications, depending on structural change, risk, and the level of assessment required.
Builders bring essential expertise in safe construction and compliance. Occupational Therapists bring a different layer of understanding, focusing on how a person’s body, movement patterns, and functional needs interact with the built environment.
This combination ensures modifications are not only built correctly, but actually work in daily life.
Simple home modifications
Simple modifications are generally low cost, non-structural changes that improve safety and function with minimal planning.
Examples include:
Grab rails
Handheld showers
Lever taps
Minor adjustments to improve access
These modifications are typically straightforward and can often be implemented quickly once the functional need is clear.
Complex home modifications
Complex home modifications involve structural changes and require coordinated planning across multiple professionals.
Examples include:
Bathroom redesigns
Stepless showers
Ramps and external access changes
Structural reconfiguration to improve mobility access
Any works over $20,000 or affecting multiple areas of the home
These modifications require careful consideration of both engineering feasibility and functional usability. A space can meet technical standards, but still be unsafe or impractical if it does not suit the person’s movement patterns and equipment needs.
Under the NDIS, complex home modifications generally require:
Assessment and recommendation by a qualified Occupational Therapist with home modification competency
A detailed functional assessment linking environment to daily activities and participation
Independent builder input to confirm feasibility and construction requirements
2 X Itemised quotes and supporting documentation
Clear justification that modifications are reasonable and necessary in relation to functional need
Coordination with relevant building or engineering professionals where required (for example, structural or plumbing changes)
The Occupational Therapist must be independent from the builder undertaking the work to ensure functional recommendations are not influenced by construction delivery.
The Occupational Therapist and the builder: different but complementary roles
A builder focuses on how to construct a modification safely and ensure it meets building standards.
An Occupational Therapist focuses on how the person will actually use the space in real life.
This includes interpreting:
Anthropometrics (height, reach, limb length, seating posture)
Wheelchair dimensions and turning requirements
Transfer methods and physical capacity
Environmental constraints such as tight spaces or fixed structural elements
Together, these perspectives ensure the modification is both buildable and functional.
Examples of when OT judgment can help
Occupational Therapy input becomes particularly important when standard design guidance needs to be adapted to real-world conditions and individual function.
Rail height, placement, and functional reach
Standard grab rail positioning provides a general reference point, but may not suit individual needs.
OT’s help by assessing:
Shoulder height, reach range, and grip strength
Whether the person is standing, sitting, or completing transfers
The exact movement required during the task
This may result in rails being positioned higher or lower than standard guidelines to ensure they are functionally usable rather than simply compliant.
Wheelchair use
Minimum standards do not always reflect how wheelchairs are actually used in daily environments.
OT’s Assess:
True wheelchair width including accessories (postural supports, trays, oxygen)
Turning circles in confined spaces
Transfer approach angles and clearance during movement
Real pathways used in the home rather than theoretical layouts
A bathroom or hallway may appear adequate on paper but still restrict safe movement in practice. OT interpretation helps identify and resolve these issues.
Working within constraints
Many homes have fixed limitations such as:
Small bathrooms
Narrow hallways
Structural walls that cannot be moved
Multi-use or shared spaces
Within these constraints, an OT prioritises function by:
Identifying the most critical activity zones (for example, showering and transfers)
Repositioning fixtures to maximise usable space
Simplifying layouts to reduce risk and improve movement flow
Balancing ideal design with what is realistically achievable
This often requires practical compromise while maintaining safety and independence.
Ramps
Standard ramp gradients may not always be achievable due to space or site limitations.
In some situations, Occupational Therapists may work with builders to consider steeper ramp gradients than standard guidance, where it is safe and appropriate to do so.
This may be relevant when:
The site is too small to accommodate a long, shallow ramp
The person has sufficient strength, equipment, or assistance to manage a steeper incline safely
The ramp is used intermittently or with support rather than independently
In these cases, OT input helps balance:
Safe propulsion or assisted access
Fatigue and effort required
Risk of falls or loss of control
Space constraints and environmental feasibility
The goal is to achieve safe access that is realistic within both environmental and functional limits.
Why Occupational Therapy assessment is essential
For complex home modifications, Occupational Therapists provide:
Functional assessment of daily activities in the home
Interpretation of anthropometrics and movement patterns
Translation of functional need into environmental design requirements
Consideration of current and future needs
Risk analysis for safety, transfers, and mobility
This ensures modifications are not just technically correct, but meaningfully usable in everyday life.