Which office buildings lenders fund for conversion to apartments: the six-test scorecard, change of use approval, building code upgrades and loan size.
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Office to Residential Conversion · Change of Use · Lender Scorecard
An empty office looks like a cheap way to make homes, but most office floors fail the conversion test before a lender looks at the numbers. Here are the six tests a building must pass, the approvals and code upgrades a conversion triggers, and how lenders size the loan.
Quick Answer
Lenders fund an office to residential conversion only when the building passes six tests: floor plate depth, window access, structure, services risers, heritage controls and location. Pass those, secure the change of use approval and a costed upgrade scope, and the project is assessed like any other development finance deal, with a larger contingency and more caution on the finished value.
Also called: adaptive reuse finance, commercial to residential conversion loan. Adaptive reuse is the planning and design term; the loan is the same facility.
What is office to residential conversion finance?
Office to residential conversion finance is the funding for buying a commercial building and turning it into homes, usually an acquisition loan to settle the building followed by a construction facility that pays for the works in stages. Planners call this adaptive reuse. Lenders treat it as a development deal with more unknowns than a new build on a cleared site.
The acquisition stage works much like site acquisition finance on any project: the lender values the building as it stands, today, as a commercial asset. The construction stage is where conversion differs. The lender is funding a change from offices to apartments, so it wants to know the building can physically become homes, that planning will allow it, and that the cost of getting there is known. If you are still deciding which loan fits which stage, our piece on which loan fits each development stage sets out the handover points.
For self-employed developers and investors, this sits inside the wider property lending picture: the same income evidence, equity and experience questions apply, with a building-specific layer on top.
Which commercial buildings suit conversion to homes?
The commercial buildings that suit conversion are the ones with shallow floor plates, good window access, a sound structure, room for new services, workable heritage controls and a location where people want to live. Most office stock fails at least one of those, which is why so few vacant offices become apartments.
| Test | The question asked | What passes | What fails |
|---|---|---|---|
| Floor plate depth | Can every bedroom and living area sit close enough to a window? | Narrow or shallow floors where apartments line the outside walls | Deep floors that leave a dark core with no saleable use |
| Window access | Do windows open, and will neighbours block the light? | Openable windows on more than one side | Sealed glass walls, or a wall built to the boundary |
| Structure | Will the frame carry wet areas, new walls and balconies? | An engineer confirms capacity from drawings and inspection | No original drawings, unknown slab capacity or concrete damage |
| Services risers | Is there room to run plumbing, exhaust and power to each home? | Existing risers and ceiling space that can be reused | Every apartment needs new penetrations through the slab |
| Heritage controls | Will heritage or character controls limit the facade, windows or roof? | No listing, or controls that allow the changes the design needs | Protections that block new windows, balconies or added floors |
| Location | Do buyers or renters want to live here? | Near transport, shops and existing housing demand | An office or industrial precinct with no residential amenity |
From the underwriter's seat, location carries the most weight because it drives the finished value the whole loan is sized against. A building that passes the physical tests in the wrong precinct still struggles to sell, and the valuer's gross realisation value will say so.
What planning approval do you need for a change of use in NSW, Victoria and Queensland?
You need planning approval for a change of use in almost every conversion, because offices and homes sit under different land use definitions, and each state runs its own pathway to that approval. The zone has to allow residential use first; if it does not, a rezoning comes before anything else.
- New South Wales. Most conversions go through a development application to council, with larger projects able to use a state pathway. Recent housing reforms have targeted commercial buildings, so check current programs on the NSW Planning Portal before you assume the standard route.
- Victoria. A planning permit from council is needed where the zone or an overlay requires one, and heritage overlays are common in older city fringe stock. The state has run fast-track programs for housing projects; check current programs and whether your project size qualifies.
- Queensland. A change from office to residential is generally a material change of use, assessed against the local council's planning scheme.
Lenders rarely fund the construction stage until the approval has issued and its conditions are known, because conditions can add cost or reduce the number of homes. Some will fund the purchase before approval at lower leverage, which our guide to site finance before DA approval covers.
Whether the building can be reclassified and what upgrades it needs is a question for a building surveyor; heritage and planning questions go to a town planner.
What building code upgrades does a conversion trigger?
A conversion triggers building code upgrades because the building moves from Class 5 to Class 2 under the National Construction Code, and apartments carry stricter requirements than offices for fire, egress, accessibility, sound and energy. The existing building is not grandfathered just because it was compliant as an office.
- Fire separation. Each apartment needs fire separation from its neighbours and the common areas, often with sprinkler and alarm upgrades.
- Egress. Stair numbers, travel distances and exit widths are checked against residential use.
- Accessibility. Entries, lifts and common paths may need work to meet current access standards.
- Acoustic separation. Floors and walls between homes need sound ratings that office partitions were never built for.
- Energy performance. Glazing, insulation and services are assessed against residential energy rules.
The building surveyor sets the upgrade scope, guided by the national Upgrading Existing Buildings handbook, which explains how a scope of upgrade work for an existing building is developed and approved. Lenders want that scope, priced by a quantity surveyor, before they will lock the construction budget.
Sources: Australian Building Codes Board, Upgrading Existing Buildings handbook. Read 2 November 2026.
How do lenders assess a conversion project?
Lenders assess a conversion the way they assess any development, through feasibility, end value, presales, the builder and the borrower, and then add a layer of questions about the existing building. The order below is roughly how a credit assessment moves.
- The scorecard. Does the building pass the six tests, backed by architect and engineer reports?
- Approvals. Is the change of use approved, and what do the conditions cost?
- Upgrade scope and budget. Has the building surveyor's scope been priced, with a quantity surveyor report the lender can rely on?
- End value. What will the finished apartments sell for, on the lender's own valuation rather than the agent's appraisal?
- Presales. Are there enough qualifying contracts, where the lender requires them, as the qualifying presales guide explains?
- Builder and borrower. Has the builder done refurbishment work at this scale, and has the developer completed a project before?
Each of those steps follows the general development process set out in our property development finance guide. What changes on a conversion is how much weight the lender puts on steps one and three. The documents a lender will ask for at each step are listed in our construction loan pack.
How much will a lender fund on a conversion, and what does the developer put in?
A lender funds a conversion as a share of total project cost and of the finished value, with both limits indicative and varying by lender, and the developer funds the rest from cash, equity in other property or a second layer of finance. The loan is set by whichever limit is lower.
The usual result is a bigger equity gap than the same number of new apartments would need, because the lender holds back on a building whose cost is less certain. That gap is often filled with mezzanine finance sitting behind the senior loan, at a higher cost.
Interest during the build is usually added to the loan rather than paid monthly. Our piece on capitalised interest on a development loan shows how that eats into the facility limit, which matters more on a conversion where the timeline can stretch. To see whether your income and equity position fits before you sign for a building, you can check eligibility.
What cost risks are bigger in a conversion than a new build?
The cost risks that are bigger in a conversion are the ones nobody can see until strip-out starts: the condition of the structure, hazardous materials, and services that turn out to need replacing rather than reusing. A new build starts from a known base; a conversion starts from someone else's decisions, sometimes decades old.
- Unknown structure. Missing drawings, slab damage or earlier alterations can force redesign once the ceilings come down.
- Hazardous materials. Older buildings may contain asbestos that has to be surveyed and removed before works proceed.
- Services. Lifts, switchboards and plumbing built for office loads often cannot serve apartments.
Lenders allow for this with a conversion contingency, typically larger than a new build's, with the size set project by project. If the budget still runs over, the paths are the same as on any development, set out in our cost overrun mid build guide. Commissioning the hazardous materials survey and structural report before you exchange on the building is the cheapest protection.
Can you finance a shop-top or warehouse conversion the same way?
A shop-top or warehouse conversion can often be financed more simply than a full office conversion, through a commercial property loan or a smaller development facility, depending on the scale and whether you will sell or hold. A single shop with a residence above is a different credit decision from a multi-level office tower.
If the shop stays commercial and only the upper floor becomes a home, the finished property is mixed use, and our mixed use property loans guide covers how lenders treat it. A warehouse carries a different building class again, so the same scorecard and surveyor questions apply, often with more structural and services work.
If you are buying an empty commercial building and not yet sure whether to convert it, compare it with how a lender funds the building held as commercial, set out in our commercial development loan piece.
Office to residential conversion finance is an acquisition loan and a construction facility for a building that has to become something it was not designed to be. Lenders fund it when the building passes the conversion scorecard, the change of use is approved, and the building surveyor's upgrade scope has been priced with a realistic contingency. Expect a larger equity contribution than a comparable new build, and run the six tests before you price the building, not after.
Key takeaway: test the building against the six-point scorecard and get a surveyor's upgrade scope before you exchange, because that is what decides whether a lender will fund the conversion.Frequently Asked Questions
Lenders lend on an office to residential conversion against a share of total project cost and of the finished value, and the exact limits vary by lender and project. Conversions often attract lower leverage than a comparable new build because more of the cost is uncertain until works start. The gap is usually filled by developer equity or mezzanine finance.
Converting an office to apartments almost always needs planning approval for a change of use, which in most councils means a development application or its state equivalent. The pathway differs between NSW, Victoria and Queensland, and some states run programs that speed up housing approvals. A lender will usually wait for that approval before funding construction, as our guide to site finance before DA approval explains.
An office building is suitable for apartments when it passes six tests: shallow floor plates, good window access, a sound structure, room for new services, workable heritage controls and a residential location. Buildings that fail two or more tests rarely stack up on cost. Once a building passes, the next step is a full development feasibility.
Converting an office is not always cheaper than building new apartments, because savings on the existing frame can be offset by fire, acoustic, services and structural upgrades that only show up once works begin. Lenders also hold a larger contingency on a conversion. The fair comparison is both options priced by a quantity surveyor on the same site.
Lenders often need presales on an office to residential conversion when the apartments will be sold, and the level required varies by lender, project size and market. Some funders will accept fewer presales at a higher cost. Our guide to qualifying presales explains which contracts count.
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