The catch nobody mentions
Open kitchen design (開放式廚房) is one of the most requested moves in Hong Kong renovation, knock down the wall, join the kitchen to the living room, and the whole flat opens up. But there is a catch most people only discover late: in many flats, removing that wall can forfeit your town-gas eligibility and force you onto induction. It is a fire-safety rule, not a design preference, and it has to be checked before you commit, because it changes both how you cook and what you spend. This guide walks through the gas rule, how to verify it, and how to keep an open kitchen liveable once the wall is gone.
The town-gas rule that decides everything
Here is the rule in plain terms. A kitchen originally designed as an enclosed, gas-ready room typically loses gas eligibility once the wall and fire door are removed, so the client is pushed onto induction (IH). By contrast, a flat sold as an approved open kitchen, one that came with an openable window, ventilation and the developer’s fire-safety package, can keep town gas in an open layout. Same open look, opposite outcome, and the difference was decided long before you moved in.
Why the wall, not just its absence, controls eligibility
The mistake is to assume eligibility hangs on whether a wall is physically there. It doesn’t. Eligibility depends on the flat’s approved building plans and fire-safety provisions, the fire door, the ventilation, the way the plans were signed off. Removing an enclosure that was part of that fire separation is what breaks the permission, which is why a flat designed open can keep gas while a flat converted to open usually cannot. The building plans, not the current state of the walls, are the authority.
Verify at the site survey, not after
Because the answer is specific to your unit, it is a due-diligence step at the site survey, checked with building management, the Authorised Person (AP) and the design team together, alongside locating the gas meter and riser. Getting it wrong late is expensive: it can mean re-quoting the hob, re-doing the electrics for a dedicated high-amperage induction circuit, and sometimes reworking the whole layout. Confirm eligibility before the design is locked, not after the wall is down.
The oil-smoke trade-off
Even where the gas question is settled, an open kitchen carries a second trade-off: oil smoke. With no wall to buffer it, high-heat Chinese cooking drifts straight into the living space, and the sofa and soft furnishings wear the consequences. The recommended answer is a semi-open layout with a glass sliding partition, open for daily flow and to keep the flat feeling generous, closed to contain smoke while the wok is going. Where gas is retained in a semi-open plan, it also lets you preserve the fire-door and ventilation conditions the approved plans require.
Extraction, induction and the island
Two more moves make an open kitchen work day to day:
- A powerful, ducted extractor. A properly sized hood venting outside can “make or break” an open kitchen; recirculating units just move the smell around the flat.
- Generous, hidden storage. With the kitchen on show, keep the worktop clear: tall cabinets to the ceiling, an integrated oven, fridge and microwave, and pull-out interiors.
- An island as a soft divider. An island can separate cooking and sink on one side from a breakfast bar on the other, zoning the space without blocking light. If you have moved to induction, remember it needs its own high-amperage circuit designed in from the start.
How Primeworks handles this
We treat the gas-eligibility check as a survey step, not an assumption, confirmed with the building management, the AP and our design team against your flat’s approved plans before any open-kitchen layout is drawn. Because we design and build under one accountable team, the consequences of that answer, the hob, the electrical load, the extraction route and any glass partition, are coordinated from the outset rather than discovered mid-build. You see the layout against your unit’s real dimensions before committing, so a forced switch to induction never arrives as a late surprise.