How is A-du different from Buildium?

Buildium is a mature, accounting-first property management suite built for growing portfolios of roughly 50–500 doors. It is excellent at the back office: full double-entry accounting, owner statements, and reporting. But it is general-purpose and begins at the listing. A-du is built specifically for Accessory Dwelling Units and covers the entire pre-rental side Buildium does not (pre-approved plans, permit-fee calculators, GIS lot lookup, and licensed contractor bidding), then handles screening, leasing, and rent collection for the finished unit.

Is Buildium overkill for one or two ADUs?

Often, yes. Buildium plans start around $62/mo and scale up to roughly $400/mo, and its deep accounting is aimed at managers juggling many doors. If you own one or two ADUs, that accounting machinery is more than you need. A-du is free to list (the landlord keeps 100% of the listed rent and the tenant pays the service fee) and focuses on the ADU workflow rather than portfolio bookkeeping.

Does Buildium help with building or permitting an ADU?

No. Buildium is a management and accounting platform; it has no ADU design catalog, permit-fee tools, GIS lot lookup, or contractor bidding. Those pre-rental steps are exactly what A-du is built for, in addition to leasing and rent collection.

Which should I choose?

If you manage a larger, mixed portfolio and need serious accounting, Buildium is a strong, purpose-built choice. If your rental is an ADU (or you are building one) in a market A-du serves, A-du covers the build and permitting steps Buildium cannot and keeps screening, leasing, and rent collection in one ADU-specific system.

A-du vs Buildium

A-du and Buildium are both landlord platforms, but A-du is specialized for Accessory Dwelling Units across their whole lifecycle, while Buildium is an accounting-first management suite for growing rental portfolios.

Buildium is strongest at the back office; A-du is strongest at everything specific to creating and renting an ADU.

The short version

Buildium is one of the most established property management platforms, and its accounting is genuinely deep: full general ledger, owner statements, and reporting built for managers running dozens to hundreds of doors. If that is your world, it is a strong, purpose-built tool.

A-du is built for a different owner: someone who owns or is building an Accessory Dwelling Unit. Before the unit exists, A-du offers pre-approved ADU plans, permit-fee calculators, GIS lot lookup, and license-verified contractor bids, none of which Buildium has. After it is built, A-du handles identity-verified screening, e-signed leases, and rent collection where the landlord keeps 100% of the listed rent, without the per-door accounting overhead a single-ADU owner does not need.

Feature comparison

A-du vs Buildium for ADU owners (2026)
Feature	A-du	Buildium
Primary purposeWhat the product is actually built to do.	End-to-end ADU platform: build, rent, and manage	Portfolio management & property accounting
Best fit	ADU owners & small landlordsIn served markets (LA County, NYC)	Growing portfoliosRoughly 50–500 doors
Pricing model	Free to listLandlord keeps 100% of rent; tenant pays the service fee	Flat monthly tiersAround $62–$400/mo; no unit minimum
ADU design & pre-approved plansHelp before the unit exists.	YesPlan marketplace incl. LADBS Standard Plan	No
Permitting tools	YesLA County + NYC permit-fee calculators, GIS lot lookup	No
License-verified contractor bids	Yes	No
Tenant screening	FCRA-compliantPass/fail, full adverse-action workflow, portable profile (AB 2493)	YesBuilt-in screening
Property accounting depthWhere Buildium is strong.	FocusedRent tracking and payouts, not full GL	DeepFull double-entry accounting, owner statements
Local ADU specialization	DeepADU rules, permit data & renter audience	General-purpose
Bottom line	An ADU-specific platform that starts at design and permitting and runs through leasing and rent collection, without per-door accounting software overhead.	A mature, accounting-first management suite built for growing portfolios; powerful, but general-purpose and starting at the listing.

How to think about it

Match the tool to the job. Buildium wins on accounting depth for a sizable portfolio. A-du wins when the rental is an ADU and you value help creating the unit and a workflow tuned to local ADU rules. For many small landlords, A-du covers what they actually do day to day without paying for a full accounting suite.

Next steps: Explore ADU plans & contractors, see the rent-collection fees, or read the full software roundup.

Related: vs AppFolio · vs Avail · vs TurboTenant · Best PM software.

Frequently asked questions

How is A-du different from Buildium?: Buildium is a mature, accounting-first property management suite built for growing portfolios of roughly 50–500 doors. It is excellent at the back office: full double-entry accounting, owner statements, and reporting. But it is general-purpose and begins at the listing. A-du is built specifically for Accessory Dwelling Units and covers the entire pre-rental side Buildium does not (pre-approved plans, permit-fee calculators, GIS lot lookup, and licensed contractor bidding), then handles screening, leasing, and rent collection for the finished unit.
Is Buildium overkill for one or two ADUs?: Often, yes. Buildium plans start around $62/mo and scale up to roughly $400/mo, and its deep accounting is aimed at managers juggling many doors. If you own one or two ADUs, that accounting machinery is more than you need. A-du is free to list (the landlord keeps 100% of the listed rent and the tenant pays the service fee) and focuses on the ADU workflow rather than portfolio bookkeeping.
Does Buildium help with building or permitting an ADU?: No. Buildium is a management and accounting platform; it has no ADU design catalog, permit-fee tools, GIS lot lookup, or contractor bidding. Those pre-rental steps are exactly what A-du is built for, in addition to leasing and rent collection.
Which should I choose?: If you manage a larger, mixed portfolio and need serious accounting, Buildium is a strong, purpose-built choice. If your rental is an ADU (or you are building one) in a market A-du serves, A-du covers the build and permitting steps Buildium cannot and keeps screening, leasing, and rent collection in one ADU-specific system.

Comparison reflects publicly available product information as of 2026 and A-du features at time of writing. Competitor pricing and capabilities change; confirm current details with each provider.