Livable Housing Design NCC 2025: What Owner-Builders Must Design For
Summary
The livable housing provisions that arrived with NCC 2022 are still the provisions in NCC 2025. Building Ministers agreed to hold major residential changes until 2029, so the goalposts you were hoping would move have not moved. Every new Class 1a dwelling you build, secondary dwellings and granny flats included, needs a step-free entry, 820mm clear door openings along the access path, 1000mm corridors, an entry-level toilet with usable clearances, a step-free shower, and wall reinforcement so grabrails can go in later. Designed in at concept stage, the whole package adds roughly $800 to $2,500 to a build. Found at frame inspection, the same items cost $4,000 to $15,000 and four to eight weeks. The cheapest place to solve it is on paper.
Table of Contents
Livable housing is the part of the National Construction Code that owner-builders most often discover late, and it is almost always discovered as a set of dimensions rather than as a concept. Nobody fails a frame inspection for not caring about accessibility. They fail it because a corridor is 900mm, a bathroom door leaf is 750mm, or a shower has a 90mm hob. The provisions live in Part H8 of Volume Two for Class 1a dwellings, they have applied to every new house, secondary dwelling and granny flat since your state adopted them, and they are written as clear widths, gradients and clearances rather than as intent.
The reason they catch people is timing rather than difficulty. Each requirement is decided at a single early moment in the job and then effectively locked. Step-free entry is decided when the finished floor level is set. Corridor width is decided when the walls are laid out. The hobless shower is decided when the slab set-out is drawn, and the wall reinforcement is decided the morning the carpenter starts framing. None of those feel like accessibility decisions when they are being made. They feel like ordinary planning decisions, which is exactly why they get made badly and why the fix arrives with a saw-cut and a new waste.
Compounding it is a documentation problem. A large number of plan sets carry a general note claiming compliance with the Livable Housing Design Guidelines at Silver level while the drawings behind the note were never checked against the clause. The note is not what gets assessed. The dimensions are. This article sets out what NCC 2025 actually requires, which stage each decision is locked at, what the compliant version costs when it is designed in, and what it costs when it is not.
What NCC 2025 changed for livable housing, and what it didn't
We get asked this weekly, so here it is plainly. NCC 2025 did not rewrite the livable housing requirements. Part H8 of Volume Two, which covers Class 1a dwellings, and the equivalent provisions for Class 2 sole-occupancy units, carry through from NCC 2022 substantively unchanged. Building Ministers agreed in 2024 to pause significant new residential requirements until 2029, and livable housing sat inside that pause.
So the practical answer is that the design targets you needed to hit in 2024 are the design targets you need to hit now. What has changed for a lot of owner-builders is enforcement. Certifiers who were generous in the first eighteen months are not generous any more, because they have been audited. State adoption dates differ (NSW and Queensland from 1 October 2023, Victoria from 1 May 2024, Tasmania from 1 October 2023 as we understand it), and we could be wrong on a specific date, so read your state appendix rather than taking our summary as gospel.
Where the livable housing decisions land in your program
The frustrating thing about these provisions is that they are cheap and easy at exactly one point in the job, and expensive everywhere after it. The step-free entry is decided when the finished floor level is set. The corridor width is decided when the walls are laid out. The shower is decided when the slab set-out is drawn. None of those decisions feel like accessibility decisions at the time. They feel like ordinary planning decisions, which is precisely why they get made badly.
Below is the shape of a typical owner-builder job with the livable housing calls marked against the stage where they are actually locked in.
| Stage | Who’s involved | Realistic duration | The livable housing call made here |
|---|---|---|---|
| Site assessment and levels | Surveyor, draftsperson, you | 1 to 3 weeks | Whether a step-free path from the boundary or carspace is achievable, or whether the site exemption applies |
| Concept sketch | Draftsperson, you | 1 to 2 weeks | Finished floor level, entry threshold, entry-level toilet location, shower location |
| Design development and drafting | Draftsperson, you | 2 to 4 weeks | Corridor widths, door schedule (820mm clear openings), sanitary clearances, wall reinforcement zones |
| Consultants | Energy assessor, engineer, soil tester | 2 to 3 weeks, overlapping | Slab set-down for the hobless shower, ramped threshold detail |
| Approval submission | Certifier or council | 10 business days to 16 weeks depending on pathway and state | Nothing new. This is where errors surface |
| Slab and frame | Concreter, carpenter, you | 3 to 6 weeks | Noggings installed or not. Last cheap moment |
| Wet area waterproofing and tiling | Waterproofer, tiler | 1 to 2 weeks | Floor falls to the waste. Second-last cheap moment |
| Final inspection | Certifier | 1 to 2 weeks | Where a missed item becomes a rectification order |
The two stages owner-builders underestimate are the first and the sixth. Site levels get treated as a formality, and framing gets treated as somebody else’s problem once the carpenter is on site. Both cost more than they should.
What Draftee does. We are an architectural drafting firm. We draw the plans, we don’t sell buildings, so we have no reason to talk you into a design that suits a supplier’s frame kit or a builder’s standard bathroom module. That independence matters most on the livable housing items, because the cheapest compliant answer is usually a small planning change and the most profitable answer for someone selling you a product is usually a bigger house. We would rather move a wall 110mm on paper than sell you an extra 4 square metres.
Stage by stage, sketch to sign-off
What follows is how we work through the livable housing items on a set of drawings, in the order we actually work through them. The numbers are the ones we draw to. Where a clause has more nuance than a single figure can carry, we have said so rather than pretending otherwise.
The site walk and the step-free entry
This is the one that decides everything else. H8 wants a step-free path from the allotment boundary, or from a carparking space on the allotment, to a doorway into the dwelling. The path needs to be at least 1000mm wide, with gradients no steeper than 1:14 on ramped sections, landings where the clause requires them, and a controlled cross-fall. The doorway itself needs a level threshold, or a compliant ramped threshold detail if you cannot get level.
There are exemptions written into the clause for sites where the slope makes a compliant path unachievable, and for cases where the floor level is forced up by flood or other constraints. The tests are tighter than most people assume, and they are not a general excuse for a sloping block. On a fall of 1200mm across 20 metres you are probably fine to argue it. On a fall of 400mm you are probably not, and we would rather tell you that at the sketch stage than have a certifier tell you at lodgement. Even where the path exemption applies, the internal requirements still do.
The floor plan: doors, corridors, and the entry-level toilet
Door openings are where cheap plan sets fall over. H8 asks for 820mm clear opening width at the dwelling access door and at doorways on the internal access path to the required rooms. Clear opening is not door leaf width. An 820mm leaf in a standard rebated frame does not give you 820mm clear. We draw 870mm and 920mm leaves depending on the frame and the hardware, and we note the clear dimension on the door schedule so the certifier is not left guessing and your joinery supplier is not left inventing.
Corridors on that path need 1000mm clear width. Not 900mm. We drew 900mm for fifteen years and it is a hard habit to break, which we know because we broke it badly. Late 2023, a secondary dwelling in western Sydney, we carried a 720mm bathroom door and a 900mm hallway straight through from an old base plan into a new drawing set. The certifier caught it at construction certificate stage. We reissued the set at our own cost and the client lost about three weeks he did not have. Nobody’s fault but ours.
The entry-level toilet needs real space around it, broadly 1200mm clear in front of the pan and 900mm across, clear of the door swing. On small footprints that usually means the door swings out, slides, or the room grows 150mm. Draw it at 1:50 and it looks fine. Draw the clearance rectangle over it and you find out the truth.
The wet areas
At least one shower on the entry level has to be step-free, 900mm by 900mm minimum, and located in a corner of the room. Step-free means no hob and no lip, so the falls have to be built into the substrate and the waterproofing detail has to suit. This is a slab set-down decision, or a floor framing decision on a suspended floor, and it needs to be on the engineer’s drawing before the concreter reads it.
Retrofitting a hobless shower into a finished bathroom is like replacing the kitchen because the new fridge is 40mm too wide for the cavity. The fridge was cheap. The kitchen was not.
Framing and noggings
The provisions require wall reinforcement in the shower and toilet areas so grabrails can be installed later without opening up tiled walls. The clause sets out the zones and heights, and the practical version is that your carpenter puts flat noggings behind the plasterboard in the nominated areas before the sheeter arrives.
Cost of doing it: $200 to $400 in timber and labour. Cost of not doing it: a tiler, a plasterer, and a bathroom you already paid for. We put a dedicated reinforcement detail on the wet area sheet with heights and extents, because a note buried in the general specification will not survive contact with a busy site.
Certifier sign-off
Certifiers check the drawings at approval and the building at inspection. What they are looking for at approval is dimensioned evidence, not compliance notes. A stamp on the cover sheet claiming Silver level proves nothing if the bathroom is scaled at 870mm across the pan.
Owner-builder budget checklist. If you are running the trades yourself, the livable housing items sit across four different subcontractors and none of them will chase the others. Our owner-builder budget checklist is where we track this kind of cross-trade item so it does not fall between the concreter and the carpenter.
Where the cost actually shows up
Designed in from the start, this is not an expensive part of a build. Here is what we see, in real numbers, on a single-storey Class 1a dwelling or a granny flat.
Wider door leaves and frames run $40 to $120 per opening over standard, and a typical plan set has four or five affected openings. Shower waste, linear grate, and the set-down detail run $600 to $1,500 over a hobbed shower with a standard 80mm waste. Noggings run $200 to $400. Widening a corridor from 900mm to 1000mm usually costs nothing in materials and costs you 100mm off a bedroom, which is a planning trade-off rather than a cash one. On a flat block, the step-free path and threshold detail run $400 to $2,000 depending on the finish. On a graded or retained site it can reach $6,000, and that is the figure worth knowing before you buy the block.
So the compliant version of your house costs $800 to $2,500 more than the 2019 version of your house. The non-compliant version, discovered at frame or final, costs $4,000 to $15,000 and four to eight weeks, plus the interest on whatever you are carrying.
The market practice we take issue with is the “Silver level compliant” note on drawings that have never been checked against the clause. It is the $49 flight of the drafting world. The headline is true, the number is real, and the thing you actually needed was never in the price. Some kit and flat-pack suppliers are still shipping brochure plans drawn before October 2023 with a compliance note bolted on the front. Some designers are copying the note across from job to job because no certifier has questioned it yet. You are the one who carries it, because as an owner-builder you are the one signing the paperwork.
Three things we would not skip on your block
Get the levels before you get excited. A contour and detail survey costs $900 to $2,200 and it tells you whether a step-free entry is a $500 problem or a $6,000 problem. Owner-builders skip this more than any other single item and it is the one we would never skip.
Get the clearances drawn, not noted. Ask whoever draws your plans to dimension the corridor, the clear door openings, the sanitary clearances, and the shower on the plan, and to include a wall reinforcement detail. If the answer is that the general notes cover it, that is your signal. A certifier assesses what is dimensioned.
Brief the carpenter and the concreter directly. The slab set-down and the noggings are the two items that get built wrong by people who were never shown the relevant sheet. Print the wet area detail, hand it over, and mention it again the week before each of them starts. It takes four minutes and it has saved our clients thousands more than once.
Ready to draw? If you are at the concept stage, this is the cheapest hour you will ever spend on livable housing compliance. Send us the block, the rough brief, and the survey if you have one, and we will tell you where the step-fre entry lands, what it does to your floor plan, and what it is likely to cost.
Questions owner-builders ask us
If it is a new detached secondary dwelling, it is Class 1a, and yes, the provisions apply to it the same way they apply to a house. This surprises people because the dwelling is small, and small is exactly where the clearances bite. A 55 square metre granny flat with a 1000mm corridor, an 820mm clear bathroom door, a 900mm by 900mm step-free shower, and a compliant toilet clearance needs to be planned around those dimensions from the first sketch. Retrofitting them into a layout drawn for 900mm and 720mm usually means losing a linen cupboard or shifting the kitchen. Better to know on day one. Check your state adoption and whether any local variation applies, because secondary dwelling rules move around more than most.
Your certifier or council checks the drawings at approval, and checks the building at the relevant inspection stages. The livable housing items surface at three points: assessment of the drawings, frame inspection for the reinforcement and framed openings, and final inspection for the shower, thresholds, and path. As an owner-builder you sit in the seat a builder would normally occupy, which means the rectification notice comes to you. We have not seen a certifier waive one of these items on goodwill in the last eighteen months, and we would not plan around the possibility.
If it is a new detached secondary dwelling, it is Class 1a, and yes, the provisions apply to it the same way they apply to a house. This surprises people because the dwelling is small, and small is exactly where the clearances bite. A 55 square metre granny flat with a 1000mm corridor, an 820mm clear bathroom door, a 900mm by 900mm step-free shower, and a compliant toilet clearance needs to be planned around those dimensions from the first sketch. Retrofitting them into a layout drawn for 900mm and 720mm usually means losing a linen cupboard or shifting the kitchen. Better to know on day one. Check your state adoption and whether any local variation applies, because secondary dwelling rules move around more than most.
There are exemptions for sites where the slope makes a compliant path unachievable, and they exist because the alternative would be unbuildable. What they are not is a blanket pass for anything with a fall. The clause sets out how the assessment is made, and it looks at the achievable route between the boundary or a carspace and the dwelling entry, not at the steepest part of your yard. We have had jobs with a 2 metre cross-fall where the exemption clearly applied, and jobs with 500mm where it clearly did not and a graded path solved it for $1,400. Get the survey first. The exemption argument is only as good as the levels behind it.
No. The requirement lands on at least one shower on the entry level, and the rest of the bathrooms in the house can be built however you like. Plenty of owner-builders put the compliant shower in the main bathroom and a hobbed shower in the ensuite, or the other way around. What matters is that the compliant one is on the level served by the step-free entry and the access path, and that it is genuinely 900mm by 900mm clear in a corner rather than 890mm because the tiler built up the wall. We dimension it to the finished face for exactly that reason.
You can pursue a performance solution against the relevant performance requirement, and on genuinely constrained sites it is sometimes the right path. It is also not a shortcut. A performance solution needs a suitably qualified person, a documented assessment method, and a certifier willing to accept it, and the total cost on a residential job typically runs $2,500 to $8,000. That is more than the compliant design would have cost in almost every case we have seen. We raise it when the site forces our hand, and we talk clients out of it when the real problem is that they liked the old floor plan better.
Related Reading
– Owner-builder reno checklist for tracking cross-trade items like slab set-downs and wall reinforcement.
– Do I need a permit? for working out which approval pathway your project sits in before you commission drawings.
– The National Construction Code, free to read via the Australian Building Codes Board, including the state and territory appendices that carry the adoption dates and variations.
Continue Your Research
1 Bedroom Granny Flats WA Price List 2026: Real Costs for a Perth Ancillary Dwelling
Shed to Granny Flat Conversion 2026: What You Need to Know
2 Bedroom Granny Flat Prices Queensland 2026: What It Actually Costs to Build
Draftee provides architectural drafting services. We do not provide legal advice, certification, or construction advice, and this article is general information for owner-builders in New South Wales, Victoria, Queensland, and Tasmania rather than a compliance assessment of your project. Livable housing requirements are adopted through state and territory appendices to the National Construction Code, so adoption dates, transitional arrangements, and local variations differ between jurisdictions. Tasmania has a state amendment in progress at the time of writing, and NCC 2025 transitional provisions may still apply depending on when your application was lodged. Clause numbers and dimensions quoted here are summarised for planning purposes. Verify the current requirements with your certifier, building surveyor, or local council before you lodge or build.
Last updated and changelog
Last updated: 22 August 2026
Changelog:
– 22 August 2026: Initial publication
