The first thing I do on a narrow block is run a tape across the front of it, then stand there doing arithmetic in my head while the owner watches. Frontage, minus a setback on that side, minus a setback on this side, minus the eaves and gutter that hang past the wall. What's left is the house. It's usually a metre or two narrower than the number people arrive with, and it's the moment the conversation gets real.
Skinny blocks are everywhere across Sydney and the Illawarra now, partly through infill subdivision and partly because land got expensive enough that developers stopped being generous with width. They build well. They just punish a design that was drawn for a wider lot and then squeezed.
Buildable width is the only number that counts
Your title says the frontage. Your planning controls say how far the walls have to sit off each side boundary, and those setbacks generally scale with the lot and with wall height, so a two storey design gives up more than a single storey one. Subtract both, then subtract the eaves overhang, because that has to sit inside the setback too.
What you're left with is the buildable width, and everything downstream comes from it. A hallway that eats a metre of it is a much bigger deal at eight metres than at fifteen. A wall thickness decision that would be trivial elsewhere starts to matter.
Work that number out before anyone starts drawing. I've seen more money wasted on redrawing a plan that never fitted than on almost anything else in the design stage.
The driveway decides the plan
On a narrow lot the car is the tyrant. Once you know where the driveway and the garage go, most of the ground floor has already decided itself.
A single garage across the front is the common answer, and it works, but it takes a serious bite out of the frontage and it leaves you with a facade that's mostly door. Pushing the garage back beside the house needs enough width for a driveway plus a manoeuvring area, which narrow blocks rarely have. A tandem garage, two cars nose to tail, buys width back at the cost of depth and a certain amount of daily annoyance. If the block has rear lane access, take it, because it frees the whole street frontage for the house.
Where the crossover can physically go is not always where you'd like it. Street trees, power poles, stormwater pits and the neighbour's existing crossover all constrain it, and council has rules about spacing off intersections and driveway widths. Check that before the plan hardens around a garage position that can't be reached.
Living upstairs, mostly
The reliable move on a narrow block is to put the living areas on the first floor.
The reason isn't fashion. Downstairs on a skinny lot is where the garage, the entry, the stairs and the services all have to live, and whatever's left is boxed in by two fences a short distance away. Upstairs you get above the fence line, you pick up light from three or four directions instead of two, and on the right block you pick up an outlook you'd never see from ground level. A ground floor bedroom, study or guest room fills the leftovers nicely, and it ages well if someone in the house eventually can't manage stairs.
The trade is that you carry groceries up, and the alfresco needs thinking about. A first floor balcony or deck off the living area usually solves it, subject to what the overlooking controls in your area will allow.
Light comes from the ends
Side windows on a narrow block look at a paling fence a short distance away. They deliver very little light and a lot of your neighbour's conversations, and privacy controls often push you to obscure glazing or high sills anyway, which finishes the job of making them useless.
So light has to come from somewhere else:
- The front and rear elevations, glazed generously, because they're the two faces with real distance in front of them.
- A void over the stair with a window or skylight above it, dropping daylight into the middle of a plan that would otherwise be dark at its core.
- A courtyard cut into the middle or side of the house. It costs floor area, which feels wrong on a tight block, and it's almost always worth it.
- Highlight windows above the fence line on the side walls, where the sight line clears the neighbour entirely.
Stack the stair, bathrooms and laundry along one side and run the living spaces the length of the other, and the dark parts of the house end up being the rooms that don't mind being dark.
The things people forget until it's too late
No side yard means nowhere to put the things a side yard normally absorbs. Bins, the hot water unit, the air conditioning condenser, the clothesline, the meter box, a spot for a bike. On a wide block these get sorted on site by whoever notices first. On a narrow block they need a designed home in the drawings, or you'll be walking sideways past a heat pump for the next twenty years.
Same goes for the boundary wall, if you're building to one. A wall on or very close to a boundary needs fire resisting construction under the National Construction Code, it can't have eaves hanging over the line, and once it's up you have no way to maintain that face of the house. Choose a cladding and a gutter detail you're happy to never touch again.
What tight access does to the price
None of what follows shows up on a plan. All of it shows up in a quote.
A truck that can't get past the front setback means materials are handballed or craned. Scaffold that needs to stand on the neighbour's land needs the neighbour's agreement, and that's a conversation worth having early rather than the week it's needed. Concrete usually goes in by pump instead of straight off the chute. Deliveries get staged in smaller loads because there's nowhere to stack anything, and every extra trip is time. Excavation with a small machine takes longer than the same hole with a proper one.
None of it is a dealbreaker. It's just the reason two identical houses can price differently on two different blocks, and why anyone quoting a narrow block off a standard rate without walking the site is guessing.
Approval on a skinny lot
Narrow frontages are one of the more common reasons a block falls out of the complying development path, because the code sets minimum lot widths and setbacks that a slim lot can miss. That doesn't stop the project, it just means council assessment. CDC vs DA in NSW explains what changes between the two paths, and the NSW Planning Portal is where both get lodged.
If the block is narrow and it also falls away, the two constraints compound and the design needs to answer both at once. Building on a sloping block covers that side of it.
Narrow block house plans that work
Three plans cover most narrow blocks, and which one fits comes down to the buildable width and where the car goes.
- Living upstairs, bedrooms down. Garage, entry, a bedroom or study and the stairs on the ground floor; kitchen, living and a balcony on the first floor where the light and the outlook are. This is the plan for the skinniest lots and for anything with a view.
- Rear living, single storey. Garage and bedrooms along the front half, then the plan opens into a kitchen and living area across the full width at the back, onto the yard. It works where the block is narrow but deep and the buildable width is enough to fit a room beside a hallway.
- Rear-lane or tandem garage. Where lane access exists, the garage goes at the back and the whole street frontage becomes the house. Without it, a tandem garage down one side leaves the other side of the ground floor free for a proper front room.
Whichever shape, the same rule holds: stack the stair, bathrooms and laundry along one side wall and run the living spaces the length of the other, so the rooms that need light get the windows and the rooms that don't get the fence.
Building on a shallow block
A shallow block is the opposite problem, wide but short from front to back, and the plan has to run across the block rather than down it. The rear setback takes a bigger share of a short lot than a side setback does of a narrow one, so the usable depth can be less than the width suggests, and a standard plan drawn for a deep lot won't fit.
The answer is usually a wide, single-depth house with the living areas along one side facing the yard, a garage and entry on the other, and bedrooms in between or upstairs. Corner lots and blocks cut across an old subdivision are the common cases, and the same tape-measure arithmetic applies: buildable depth first, then the plan.
Start with the tape measure
A narrow block rewards a design drawn for its actual dimensions and punishes a wide-block plan with the sides shaved off. Get the buildable width, the crossover position and the approval path settled first, and the house that comes out the other end usually feels bigger than the land had any right to give you.
If you've got a skinny block around Wollongong, the Illawarra or the Southern Highlands, have a look at how we approach new homes, then call us on 0434 037 851 or get in touch through the contact page. We'll come and measure it properly and tell you what will genuinely fit.
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