Before you fall in love with an open-concept kitchen on Pinterest, spend half an hour with your HDB floor plan. It is the single best tool for knowing which ideas will work in your flat and which ones will be rejected, cost far more than expected, or simply be impossible.
HDB flats share many design features, but each block and flat type has its own quirks. This guide walks through how to read an HDB floor plan with a renovation in mind: the symbols, the walls you cannot touch, the household shelter, the service yard and the wet areas. It is not a substitute for checking with HDB or a registered contractor, but it will help you ask much better questions.
Where to Get an Accurate Floor Plan
Sales brochures for new BTO projects show indicative layouts, but these are simplified and may differ slightly from the final flat. For renovation, you want the most accurate plan available for your specific unit.
- For new BTO flats: keep the layout from your booking documents and the brochure, then compare it with the actual flat at key collection.
- For resale or existing flats: HDB offers floor plans for purchase through its online e-services. Requirements and charges can change, so check the HDB website for the current process.
- From your contractor or designer: many will measure your flat and draw an updated plan, which is helpful if previous owners made changes.
Always measure key dimensions yourself before ordering built-in carpentry. Plans are drawn to scale, but small differences on site are common.
Common HDB Floor Plan Symbols
Floor plans use a shorthand that looks confusing until you know the basics. Exact styles vary between drawings, but these are the elements you will usually see:
- Thick solid or shaded walls: often indicate reinforced concrete or structural walls. Thinner lines usually indicate non-structural partitions. Do not rely only on thickness, because conventions differ, so confirm with HDB’s records or a contractor.
- Arcs at doorways: show the door swing direction, which matters when planning wardrobes and furniture near the door.
- Double or triple lines in walls: usually windows.
- Labels such as “HS”, “SY”, “BTH”, “WC” or “KIT”: household shelter, service yard, bathroom, toilet and kitchen.
- Dashed lines: may show beams, ledges or features above eye level, such as a bulkhead or a sunken area.
- Small squares or circles: can mark columns, pipes or service ducts. These are usually fixed and cannot be removed.
Note the dimensions too. Room sizes are often given in metres, while some plans use millimetres for walls and openings.
Structural Walls and What You Cannot Remove
The biggest renovation question for most owners is “can I hack this wall?” HDB flats contain structural elements that hold the building up, and these cannot be removed or altered. Others are partitions that may be removable with approval.
When reading your plan, look for:
- Walls shared with neighbours and the corridor. These are typically structural or have restrictions.
- Columns and beams. Even if a wall is removable, a beam above may remain, which affects ceiling design.
- Walls around the household shelter. These cannot be hacked, drilled into or altered.
HDB has rules on what can and cannot be changed, and some works need a renovation permit. HDB-registered renovation contractors can check whether a wall is structural and apply for permits where needed. Read our guide to HDB renovation rules, permits and contractors before you finalise any layout changes.
Household Shelter, Service Yard and Wet Areas
These three spaces shape a lot of renovation plans.
Household shelter (HS). Most HDB flats built in recent decades include a household shelter, a reinforced room designed to protect occupants in an emergency. Owners often use it as a storeroom or small study. The shelter walls, ceiling, floor and door have strict rules. You generally cannot hack, drill or nail into them, and the steel door must remain able to close. Check the Singapore Civil Defence Force (SCDF) and HDB guidelines for what is allowed, such as approved ways to add shelving.
Service yard (SY). This is usually next to the kitchen and used for laundry and drying. It often contains the drying rack fittings, a floor trap and sometimes the gas or water meter. Some owners want to merge it with the kitchen. Whether that is possible depends on the layout and HDB rules, and pipes, floor traps and window positions may limit what you can do.
Wet areas. Bathrooms, toilets and kitchens have waterproofing beneath the floor. In many HDB flats, changing bathroom floors or moving toilets and floor traps is restricted, especially in the early years after completion. Moving a toilet bowl, for example, may not be allowed because of the pipe position below. Check with HDB before planning major wet-area changes.
Reading the Plan Room by Room
| Area on the plan | What to check | Why it matters for renovation |
|---|---|---|
| Living and dining | Wall types, column positions, window locations | Decides whether an open-concept layout is possible |
| Kitchen | Gas point, sink position, service yard access | Plumbing and gas positions limit cabinet layout |
| Bedrooms | Door swing, window walls, aircon ledge | Affects wardrobe size and bed placement |
| Bathrooms | Floor trap, toilet position, shower area | Moving plumbing is often restricted |
| Household shelter | Door swing, internal size | Shelving and storage must follow the rules |
Walk through each room with the plan in hand and mark these points. Photos of each wall, matched to the plan, make conversations with designers far easier.
Planning Ideas That Fit Your Layout
Once you understand the plan, you can test your design ideas against it:
- Open kitchens: only possible if the kitchen wall is non-structural and the change is permitted. Consider ventilation and cooking smells.
- Combining bedrooms: possible in some layouts if the partition wall is removable, but think about resale appeal.
- Built-in storage: measure alcoves, ledges and space behind doors. The door swing arcs on the plan show where cabinets will clash.
- Lighting and power points: mark existing points on the plan, then decide where you need more.
- Aircon placement: check where the aircon ledge is so you can plan trunking routes neatly.
If you have just collected keys to a new flat, our guide to renovating your new BTO flat covers the timeline and early steps. Before any works start, run through an HDB or condo defects checklist so defects are reported and fixed first.
Questions to Ask Your Contractor
Bring your marked-up floor plan to every quotation meeting and ask:
- Which walls on this plan are structural, and how did you confirm that?
- Which of my planned works need an HDB permit, and who applies for it?
- Are there restrictions on the wet areas in my flat at this stage?
- How will the design work around the household shelter rules?
- Are any of the dimensions on the plan different from what you measured?
A contractor who answers clearly, and who refers to HDB’s rules rather than guessing, is a good sign. Rules can change over time, so confirm current requirements on the official HDB website before you commit to a design.
Official sources: HDB
Further reading: Asbestos in Older Singapore Homes: What to Check Before Renovating · How to Read an HDB BTO Sales Brochure: Floor Plans, Site Plans and Prices