Half Duplex | Living in one
The Shared Wall and What You Will Hear
This is the objection most people raise first, and it is usually based on an older building than the one they are looking at.
The short answer
How much you hear depends on how the party wall was built, not on the fact that one exists. Newly built homes are constructed to current code, which is meaningfully better on sound separation than the older duplexes and conversions most people are thinking of. Ask the builder what the wall assembly is.
What actually decides it
Sound gets through a party wall in two ways: airborne, which is voices and television, and impact, which is footsteps and doors. They are addressed differently in construction, and a wall can be good at one and poor at the other.
Mass, separation, and continuity are what matter. A double wall with a gap performs very differently from a single wall with insulation, and any gap in the assembly, at an outlet or where the wall meets the floor, undoes a lot of the rest.
Why new construction is a different proposition
Most people's mental model of a noisy duplex comes from an older building or a house conversion, where the wall was never designed for sound separation at all.
A newly built half duplex is constructed to the current BC Building Code, which sets requirements for sound transmission between dwelling units. That is not a guarantee of silence and it is a different starting point from the stock the reputation comes from.
What to ask and what to test
Ask the builder or the listing agent what the party wall assembly is, in writing. A builder who has spent money on sound separation is usually pleased to tell you.
Visit when the other side is occupied if you can. Standing in an empty home tells you nothing, and an empty adjoining unit tells you less.
- → Ask for the party wall assembly, and whether it is a double stud wall
- → Check whether the wall runs continuously to the underside of the roof
- → Stand in the rooms that back onto the wall, particularly bedrooms
- → Ask whether the stairs or laundry are against the shared wall, which is where impact noise shows up
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Common questions
Are half duplexes noisy?
It depends entirely on the wall. A newly built home is constructed to current code requirements for sound transmission between dwelling units, which is a materially different starting point from an older duplex or a house conversion, which is where the reputation comes from.
What should I ask the builder?
What the party wall assembly is. A double stud wall with a gap performs very differently from a single wall, and a builder who invested in sound separation will generally tell you happily. Get it in writing rather than as a verbal reassurance.
Is impact noise different from voices?
Yes, and they are handled differently in construction. Airborne noise is voices and television. Impact noise is footsteps, doors, and stairs, and it travels through structure rather than air. A wall can perform well on one and poorly on the other, so ask about both.
Where these figures come from
- VanPlex active listings, MLS® data
Active townhouses, half duplexes, and row houses built in the last two years across Metro Vancouver and the Fraser Valley.
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- BC Housing, new homes registry and warranty
Confirms a builder's licence and a home's 2-5-10 warranty coverage.
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See the half duplexes on the market
Every figure in this hub comes from listings you can open. Search the full set and filter by price, bedrooms, freehold or strata, pets, parking, and distance to a station.