Modular and Kit Home Loans: Build Requirements

A modular home loan can fund a fixed prefabricated dwelling when the lender accepts the finished property and the build’s payment schedule. For brokers, the deciding issue is whether each factory payment fits the finance available before the home reaches the land.

Assess the complete residential build, including transport and installation. A kit-only price leaves out work that someone must still fund and finish.

Define the Build Method

Describe what leaves the factory and who turns it into a completed home on the client’s land. Modular homes arrive as built sections, while kit homes arrive as prepared components for assembly. Both sit within prefabricated construction.

Record the factory work and the on-site work separately. Include foundations, module joining or kit assembly, weatherproofing, service connections and finishing. Name the party responsible for each task and the date that task must finish.

Use two classifications when assessing mortgage loans for manufactured homes:

• A fixed residential dwelling has a documented route to permanent installation, connected services and completed residential use.
• A movable dwelling or a components-only purchase needs a different assessment of the asset, tenure and remaining work.

If the proposal stays movable, use the tiny home finance guide. A supplier’s description of a building as a home doesn’t establish that it will become acceptable mortgage security.

Two published lender routes illustrate fixed-build acceptance. As at October 2026, CommBank’s prefab home guidance covers modular and kit homes permanently affixed to land. It funds eligible builds progressively through a construction loan, including an off-site funding stage.

As at October 2026, Keystart’s Modular Home Loan covers factory-built homes fixed to land with utilities connected. Its route uses its established builders’ list and minimum building requirements. That is a modular-build pathway, so a kit supplier’s materials quote alone doesn’t establish eligibility for it.

For general construction stages and borrower evidence, use the construction loan requirements guide. Here, the extra work is aligning factory manufacture with the land security and installation contract.

Check Land and Approvals

Establish that the client can lawfully install the specified dwelling on the proposed land before accepting a factory delivery date. Record the title owner, existing mortgage, boundaries, easements and any restrictions affecting residential construction.

Build a site file with evidence of:

• Legal access to the block and physical access for delivery vehicles and cranes.
• Foundation design and site preparation costs, including excavation or retaining works.
• Available water, electricity and wastewater connections, with quoted costs and expected connection dates.
• Planning approval where required, the building permit and the plans that those approvals cover.
• Site conditions affecting the design, such as slope, flood exposure or bushfire requirements.

In Western Australia, the building approvals authority identifies local government as the body that assesses the application. Match the factory design to the approved plans for the actual site. Record any approval condition that must be met before installation.

A hypothetical delivery delay shows the dependency. The manufacturer finishes the modules in November, but the access track and crane pad won’t be ready until December.

The file needs the revised delivery date and any storage costs, plus evidence of who funds them. A finished factory module still needs a prepared site before it can become the completed security property.

For a mortgage for a prefab home, a delivery quote must cover the route to that site. Check whether road restrictions, overhead lines or difficult access require separate work or approvals. Resolve these costs in the budget before construction starts.

Review Contracts and Counterparties

Map every contract to the work it covers and the party responsible for completion. A single builder may carry the whole project, or separate businesses may manufacture, transport and install the home.

Party	Evidence to collect	Gap to resolve
Manufacturer or kit supplier	Exact contracting entity, specifications, factory milestones and warranty terms	Who owns paid materials and unfinished modules if the business fails?
Transport provider	Delivery scope, access assumptions and transit insurance	Who pays for storage, damage or a failed delivery?
Builder or installer	Registration, installation scope, insurance and completion obligations	Who completes foundations, joining, services and defects?
Borrower	Signed contracts, cash contribution and separately funded works	Which excluded works remain the client’s responsibility?

Have the client’s solicitor explain title to factory goods, termination rights and responsibility gaps before binding commitments. Record the outcome for the finance file.

A broker can identify an unresolved contract dependency without advising on its legal effect.

Check the registration of the contracting business, not just an individual’s credentials. The Western Australian registration guidance, updated 14 September 2026, distinguishes contractor registration from practitioner registration. A practitioner can supervise a registered contractor but cannot provide building services directly to another person under that registration alone.

Lender assessment also matters. CommBank says, as at October 2026, that its assessed manufacturers meet financial criteria and undergo a factory inspection at assessment. That status is not a guarantee of future solvency or workmanship.

Keystart’s modular builder fact sheet, as at October 2026, describes financial due diligence for businesses joining its established list.

Keep insurance certificates with the contracts. Identify whether cover applies during factory manufacture, storage, transport and installation. Refer exclusions to the insurer or solicitor.

Reconcile the lender’s accepted counterparty with the entity named on the actual contract.

Align Payments With Security

Compare cumulative payments due before installation with the lender’s permitted off-site releases and the client’s available cash. A loan amount that covers the total build can still leave an unfunded factory payment.

1. List each deposit and progress claim, its amount, due date and required completed work.
2. Put the lender’s release condition beside that claim, including inspection evidence and any off-site funding ceiling.
3. Record borrower funds available on that date and any requirement to use them first.
4. Calculate the remaining work and money after each release. Retain enough funding for transport, installation and all excluded works.
5. Obtain an agreed payment schedule before the client accepts contractual obligations that depend on loan funds.

A broker can use Bulma’s Policy Advisor to compare lender rules and retain the quoted policy with the file. The lender’s approval and drawdown conditions then govern the actual payment schedule.

CommBank’s Off-Site Funding Limits

CommBank’s Prefab Homes guide, as at October 2026, limits off-site releases for eligible fixed-price contracts up to $1.5 million.

The land must be owned, refinanced or purchased for the permanent home.

For an assessed manufacturer, the ceiling is the lower of 80% of the build contract or 150% of land value less land debt. Other manufacturers have lower ceilings: 60% of the contract or 120% of land value less land debt, whichever is lower. Apply the multiplier to land value first, then subtract land debt.

Consider a hypothetical $400,000 contract on land valued at $300,000 with $150,000 land debt. The assessed-manufacturer ceilings are $320,000 and $300,000, so the lower ceiling is $300,000.

Other-manufacturer ceilings are $240,000 and $210,000, giving $210,000. A $250,000 pre-installation claim exceeds the latter by $40,000.

The client needs evidenced funds or a revised schedule for that difference. CommBank warns that the land remains sole security before affixture. Builder failure can leave negative equity while the debt remains repayable.

These are CommBank’s rules, not market-wide limits.

Keystart’s Modular Route

As at October 2026, Keystart accepts eligible modular builds in Western Australia through its Low Deposit Home Loan. Its modular page includes options for purchased land, already-owned land and land with existing finance.

Assess that specific route before applying the general product page’s ownership exclusions to an existing-land client.

The borrower must occupy the home. Keystart’s Low Deposit Home Loan page requires stable income or regular employment for at least six months. The deposit is the higher of 2% or $2,000, with location and purchase-price conditions.

Income and property-price limits also apply to the modular route.

Its modular builder fact sheet sets four claims:

Claim	Contract share	Release evidence
Deposit	6.5%	Registered mortgage over land, deposit invoice and building indemnity insurance
Lock up	35%	Approved permit and plans, completed stage and lender-appointed valuer inspection
Tiler and cabinet stage	25%	Completed stage and lender-appointed valuer inspection
Completion	33.5%	Satisfactory final inspection, customer sign-off and home insurance

The contract must include access, transport and site connections. The fact sheet requires inspection access at every stage after the deposit. Completion means the home is secured on site, installation finished and services connected, with flooring and appliances complete.

Keystart’s minimum building requirements exclude owner-builder homes. The signed contract needs annexures, a costing schedule and signed plans and specifications. Structural price variations require approval.

Compare these conditions with the actual proposal before describing either a kit build or a particular builder as accepted.

When a claim fails, identify the mismatch. An inspection shortfall needs the unfinished work completed. A claim above the permitted release needs an agreed funding or contract change.

Send the lender the affected invoice and evidence of remaining costs before another commitment falls due.

Test Valuation and Completion

Give the valuer the complete land-and-home proposal so the valuation covers the finished dwelling, not just the factory price. Include approved plans, specifications, all contracts and variations, plus foundation, transport and service costs.

Identify comparable completed homes where available. Explain differences in location, size, finish and construction method without assuming contract cost equals market value. If the valuation supports less finance than the budget needs, recalculate the client’s contribution before relying on the loan.

As at October 2026, CommBank requires a valuation confirming permanent affixture on completion. Its final inspection must confirm the home is fixed to land and connected to services before remaining construction funds are released.

As at October 2026, Keystart withholds the final claim until its minimum building requirements are satisfied. These cover functioning living facilities, services and specified finishing work. Required retaining works must also be complete.

Build the handover file around the approval and loan conditions:

• Final lender inspection and clearance of outstanding payment conditions.
• Required structural, electrical, plumbing and other inspection or test certificates.
• Completion documentation and occupancy approval where the jurisdiction and building class require it.
• Home insurance effective for the completed property, plus applicable warranty documents.
• Final invoices, paid amounts and evidence that remaining work is funded.

For the Western Australian example, the completion requirements from Perth requires the responsible builder to submit form BA7 within seven days of completion. Relevant inspection and test certificates accompany it. Match the completion documents to the actual permit and building class.

The file is ready for the final drawdown when the lender clears its completion conditions and the finished property matches the approved scope. A later refinance needs its own credit and security approval. If installation, services or final certification remain open, resolve that exact item before treating the home as completed mortgage security.