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HDB · Guide · Updated 18 August 2026

HDB Electrical Loading: What 30A to 40A Actually Changes

The hdb electrical loading upgrade, explained for people planning a renovation: how to check hdb electrical loading for your own block, what 30A and 40A each permit, and why the upgrade programme still has four years to run before the last blocks are done.

HDB distribution board showing the main switch rating

The short version

The one-minute version: check your block on HDB’s check electrical load of HDB block tool, then look at the rating on your own main switch, 30A or 40A. Higher electrical loading HDB status is what removes the permit requirement for new 15A air-conditioner points. If your block is still on 30A, HDB is upgrading about 1,500 older blocks to 40A by 2030, and your notice letter, not any website, is the authority on when.

HDB electrical loading is the approved supply rating of your flat: 30A on older blocks, 40A on newer and upgraded ones. It decides whether a new 15A air-conditioner point needs an HDB permit, and it is printed on your own main switch. HDB is upgrading roughly 1,500 older blocks to 40A by 2030, block by block, and the notice letter for your block is the authority on when.

How to check your block in a minute

Two checks, and you should do both because they answer slightly different questions.

One: HDB’s own lookup. The Check Electrical Load of HDB Block service lets you enter your block and read its status directly from the source. It ranks first on Google for this question, which is a fair indication that it is the definitive answer.

Two: your main switch. Open the distribution board, usually near the front door, and read the rating printed on the main switch. It will say 30A or 40A.

Why the two can disagree

Because they are not measuring the same thing. The tool describes the block’s incoming supply. The main switch describes what your unit is currently rated at. A block can have been upgraded while an individual flat still carries older equipment, and a main switch can carry a rating the supply behind it does not support.

For anything where money depends on the answer: a renovation, an induction hob, an air-conditioning quote, have a Licensed Electrical Worker, the electrician Singapore renovations actually depend on, confirm it rather than relying on your own reading of a label.

What ELUP HDB actually means

The Electrical Load Upgrading Programme raises the unit electrical power supply in older HDB blocks from 30 amps to 40 amps.

The scope is stated in a Ministry of National Development written answer dated 7 May 2026: HDB will upgrade the unit electrical power supply from 30 amps to 40 amps for about 1,500 older HDB blocks by 2030. See MND’s written answer on upgrading electrical power supply for HDB blocks. It targets blocks from the 1970s, 1980s and early 1990s still on the older rating.

What 30A versus 40A means in appliances, not amps

Rough arithmetic on a single-phase supply puts 30A at around 6.9kW and 40A at around 9.2kW. Treat those as approximate conversions rather than official figures: they are the multiplication, not a published specification.

What the extra headroom buys is the modern combination running together: air-conditioning, an induction hob, a built-in oven, a water heater and a kettle, overlapping at dinner time. A flat on 30A is not incapable of any of those individually.

It is about simultaneous use

This is the part that surprises people. Nobody runs everything at once, and installations are designed on the assumption that they will not, which is why a 30A flat can own high-power appliances quite happily and still trip on the one evening when the aircon, the oven and the kettle coincide. If your flat trips predictably at moments of heavy overlap and nothing is warm afterwards, that is a loading pattern rather than a fault, and the power trip troubleshooting guide covers how to tell the difference.

The 15A permit rule

This is the most consequential rule on the page, and HDB states it plainly: flats without higher electrical loading require an HDB permit to install new 15A power points for air-conditioners or other higher-capacity appliances, see HDB renovation guidelines for electrical works.

So the permit question is decided by your loading status, which is why checking it comes before designing anything. It is also why the aircon isolator and its power point starts with the same question.

The 1994 cutoff and the Main Upgrading Programme

HDB’s guidance ties higher loading to blocks completed on or after 1 January 1994, or blocks that have been through the Main Upgrading Programme, where the incoming electrical supply was also upgraded. If your block falls into either category, you generally have a 40a supply and are in the higher-loading group.

Do not infer it from the age of your flat alone, though, consumer guides circulate conflicting rules of thumb about which era has which rating. Check the tool.

Planning aircon or an induction hob? Check the loading before the kitchen design

Ask about your flat

What the upgrade day is actually like

Expect your supply to be interrupted for part of a day, and expect written notice of the dates. This is the part no government page describes and no commercial page bothers with, so it comes from residents who have been through it and posted about it.

The reported pattern: households are notified in writing of the downtime dates closer to the works, and the changeover itself takes a portion of a day per unit. Plan for it exactly as you would for any planned outage, the fridge, anyone working from home, and above all anyone relying on mains-powered medical equipment.

Is it optional?

Residents who have been through it describe the upgrading as mandatory rather than opt-in. That makes sense given that it is block infrastructure rather than a per-flat improvement, but it does mean the useful question is not whether to accept it, it is when yours is scheduled, and the answer to that is in your notice letter.

How it fits with HIP and NRP

HDB’s own Home Improvement Programme page notes that the electrical load upgrade is carried out after HIP works, where necessary , see HDB’s Home Improvement Programme. Loading works also appear alongside the Neighbourhood Renewal Programme in residents’ notices.

The practical consequence for anyone renovating: if your estate is in one of those programmes, the loading upgrade may be closer than you think, and it is worth asking before committing to a permit route that a few months of patience would remove.

Can you go beyond 40A?

A live question in Singapore forums, and one no commercial page answers. The honest version has two halves.

The supply is not yours to buy. What comes into your unit is set by the block’s infrastructure and by HDB, not by whoever you engage. Anything beyond the standard arrangement is a question for HDB about your specific block, and any contractor promising otherwise is promising something they do not control.

What can be changed is how you use what you have. Rearranging circuits, giving heavy appliances their own dedicated circuits so they are protected properly, and using load-managing equipment, particularly for home EV charger installation, where a charger that moderates its own draw can make an otherwise marginal supply workable.

Not upgraded, and you want air-conditioning now

You are not stuck. This is a live Reddit thread on this exact search and it deserves a straight answer.

A flat without higher loading can still have air-conditioning installed, what changes is that a new 15A point brings the HDB permit requirement described above. So the route is: confirm the loading status, have your Licensed Electrical Worker establish what the existing supply and board can carry, and handle the permit as part of the job rather than discovering it midway.

Where the flat is genuinely tight on capacity, the conversation moves to how many units, on what circuits, and whether the installation should be staged, see power point and socket installation and electrical work in HDB flats.

Loading and your DB box are different questions

Confusing the two is one of the more expensive mistakes in a Singapore renovation.

Loading is how much current your unit can draw in total. Ways are how many circuits your distribution board can hold. A modern board with six spare ways on a 30A supply gives you somewhere to connect new circuits and no extra capacity to feed them. Adequate loading with a full board is the opposite problem, and the fix is a board upgrade, circuit breaker and DB box work rather than anything to do with HDB.

Planning a renovation around loading

Check first, design second. The order matters because the loading answer changes what is possible, what needs a permit, and in some cases what the kitchen can contain.

The sequence that avoids variation orders: confirm loading status; list the heavy appliances you actually intend to install; have the board and circuits assessed against that list; then let the designer draw. If a rewire is on the table anyway, HDB rewiring is the moment to get the board and the circuit arrangement right, and how long HDB wiring lasts covers whether you need one at all.

What it costs

ELUP itself is HDB’s programme, not a service you purchase from an electrician, and we are not going to publish a figure for something we do not deliver and cannot source.

What does have published Singapore ranges is the renovation electrical work that often accompanies it: distribution board repair or replacement at S$320–800, or from S$380 for a 6-way board; a new power point on surface trunking at S$120–220. Those are third-party published figures, collected 18 August 2026, and none is our rate, full list on published Singapore price ranges.

What you may do yourself

Looking is yours. Checking the tool, reading the main switch rating, photographing the board, and asking questions. Everything else is not: changing a main switch, altering circuits, or fitting 15A points is electrical installation work restricted to a Licensed Electrical Worker, and you can verify any electrician in about a minute at the ELISE licence check guide.

What we do not claim

We cannot tell you when your block is scheduled. No website can. HDB’s tool tells you your current status; your notice letter tells you your dates.

The kilowatt conversions above are arithmetic, not official figures, and are labelled as such. Every price is a published third-party range with its source named. We do not publish an ELUP cost to residents, because it is not our programme to price.

From the trade
That's going to be eight to 10 hours pulling 32 amps.
Jordan, Artisan Electrics , UK electrical contractor, on why sustained loads break supplies
What it means for you: Loading is about sustained draw, not peak gadget count. In a flat, the main switch rating is the ceiling, check your block's figure before planning anything that runs for hours at high current.

HDB electrical loading questions

How do I check my HDB flat’s electrical loading?

Two ways, and it is worth doing both. HDB publishes a lookup tool: Check Electrical Load of HDB Block: where you enter your block and see its status; it currently ranks first on Google for this question, which tells you how definitive it is. Then look at your own distribution board, usually near the front door, and read the rating on the main switch: 30A or 40A. If the two disagree, remember they answer slightly different questions: the tool tells you about the block’s incoming supply, the main switch tells you what your unit is currently rated at. Where a renovation depends on the answer, have a Licensed Electrical Worker confirm it rather than relying on your own reading.

What is the Electrical Load Upgrading Programme?

ELUP is HDB’s programme raising the unit electrical power supply in older blocks from 30 amps to 40 amps. A Ministry of National Development written answer dated 7 May 2026 states that HDB will upgrade the supply from 30 amps to 40 amps for about 1,500 older HDB blocks by 2030. It is aimed at blocks from the 1970s, 1980s and early 1990s that are still on the older rating, and it is commonly sequenced alongside other estate programmes, HDB’s own Home Improvement Programme page notes that the electrical load upgrade is carried out after HIP works where necessary.

What does 40A let me run that 30A does not?

The honest answer is about simultaneous use rather than about any single appliance. Rough arithmetic on a single-phase supply puts 30A at somewhere around 6.9kW and 40A at around 9.2kW, treat those as approximate conversions rather than official figures. What that extra headroom buys is the ability to run the modern combination without nuisance tripping: air-conditioning, an induction hob, a built-in oven, a water heater and a kettle overlapping at dinner time. A flat on 30A is not incapable of running any of those; it is more easily overwhelmed when several of them coincide.

Do I need an HDB permit for a 15A air-conditioner point?

HDB’s renovation guidelines are explicit: flats without higher electrical loading require an HDB permit to install new 15A power points for air-conditioners or other higher-capacity appliances. So the permit question is decided by your loading status, which is why checking it comes before designing anything. Flats in blocks completed on or after 1 January 1994, or that have been through the Main Upgrading Programme, are generally in the higher-loading category. If your block is not, that does not mean you cannot have air-conditioning: it means there is a permit step, and your electrician should confirm the position in writing for your exact scope.

What happens on the day my block is upgraded, and is it mandatory?

Residents who have been through it report that the upgrading is mandatory rather than opt-in, and that HDB or the town council notifies affected households in writing of the downtime dates closer to the works. Expect the supply to your unit to be interrupted for part of a day while the changeover happens. The practical preparation is the same as for any planned outage: plan around the fridge and any mains-powered medical equipment, and do not schedule work-from-home for that window. Your own notice letter is the authority on your dates: no website, including this one, can tell you your block’s schedule.

Can I go beyond 40A in an HDB flat?

This is a live question in Singapore forums and the honest answer has two halves. The supply into your unit is set by the block’s infrastructure and by HDB, not by your electrician, so it is not something you can simply buy an upgrade to in the way you might increase a board’s size. Anything beyond the standard arrangement is a question to put to HDB for your specific block rather than to a contractor. What an electrician can do within your existing supply is often more useful than people expect: rearranging circuits, adding dedicated circuits for heavy appliances, and using load-managing equipment so that a large intermittent load such as EV charging does not coincide with everything else.

Is electrical loading the same as having spare ways in my DB box?

No, and confusing the two is expensive. Loading is how much current your unit can draw in total, a supply question. Ways are how many circuits your distribution board can accommodate, a board question. You can have a large modern board with plenty of spare ways sitting on a 30A supply, in which case you have somewhere to connect new circuits but no additional capacity to feed them. You can equally have adequate loading and a full board, in which case the fix is board work rather than a supply question. A competent quote for a renovation should address both, separately.

What your flat is allowed to draw
Typical HDB main switch ratings by era Flats built before 1994 were typically provided with a 30 amp main switch, flats from 1994 onward typically 40 amps, and ratings of 60 amps and above generally exist only where a supply upgrade was applied for. Around 1,500 older blocks are in HDB's Electrical Load Upgrading Programme, which raises 30 amps to 40 amps and is targeted for completion by 2030. 30A Most flats built before 1994 40A Typical from 1994 onward 60A and above Only where applied for ELUP: ~1,500 older blocks, 30A → 40A by 2030
The main switch rating is the ceiling on everything you add. Check your own block on the HDB e-service before anyone quotes you for extra points.

Related guides

Send your block number and a photo of the board, and describe what you want to add

Check my flat
Where loading sits in the sequence
The gates an electrical job passes through, in order Four gates in sequence. First, what the block supply is actually rated at, which caps everything. Second, whether the work needs a permit or is covered by HDB renovation guidelines. Third, the licensed electrical worker who may lawfully do it. Fourth, testing and handover records. Clearing them out of order is what turns a short job into a delayed one. 1 Capacity What the supply to the block is rated at. Caps everything. 2 Approval Whether a permit applies, per HDB renovation rules. 3 Who may Installation work is restricted to a licensed worker. 4 Test, label, hand over. Gate 1 is free to check and settles most arguments before a quote is even written. Timing, not money, is the usual casualty: an approval sought after the work starts stops the work. Confirm gates 1 and 2 before booking anyone.
Loading is gate 1 for a reason: everything downstream is capped by it, and it is published and free to check.

Citations

Sources for every figure on this page

Every figure quoted above is a published third-party number, not an estimate of ours. Where sources disagree, both are shown. Collected and last reconciled 21 August 2026.

  1. The 30A, 40A and 60A block loading figures on this page, which come from HDB’s own published e-service.

    HDB e-service: check the electrical load of an HDB block , checked 21 August 2026

  2. The upgrading programme covering roughly 1,500 older blocks from 30A to 40A.

    MND written answer: upgrading electrical power supply for HDB blocks , parliamentary reply

  3. Which electrical works in an HDB flat need approval, and the conditions attached.

    HDB: renovation guidelines for electrical works , checked 21 August 2026

  4. The Home Improvement Programme, cited on block-level upgrading.

    HDB: Home Improvement Programme , checked 21 August 2026

  5. That electrical installation work is restricted to a Licensed Electrical Worker, and what to ask before letting anyone start.

    EMA: engaging licensed electrical workers , checked 21 August 2026

Published prices move. If a figure here no longer matches the source, the source wins, tell us and it gets corrected rather than quietly left to rot.

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