Renovation is exciting. You have picked your tiles, chosen the kitchen layout, and finalised the colour scheme. But behind those freshly painted walls and new cabinets, electrical work forms the backbone of your renovated home. Getting it right means thinking about it early, not as an afterthought.
Whether you are renovating an HDB flat, a condo, or a landed property, the electrical scope is often more involved than homeowners expect. This guide covers what electrical work is typically needed, how to coordinate with your interior designer, and where Licensed Electrical Worker (LEW) requirements come into play.
Electrical work commonly needed during renovation
Most renovations involve more electrical work than simply adding a few power points. Here is what typically comes up.
Power point additions and relocations: New furniture layouts usually mean power points need to move. Kitchen countertop appliances, study desks, TV consoles, and bedside tables all need conveniently placed sockets. Each new point requires wiring back to the DB box.
Lighting changes: Replacing fluorescent tubes with LED downlights is one of the most common renovation upgrades. Cove lighting, feature lighting, and separate lighting zones all require new wiring and potentially additional circuits. Our lighting and LED installation services cover everything from basic replacements to full lighting redesigns.
DB box replacement: If your flat is more than 15 years old, the renovation is a good time to replace the DB box. A new distribution board with modern MCBs and RCCB protection handles the increased electrical load from new appliances and provides better safety.
Dedicated circuits: High-power appliances need their own dedicated circuits. Induction hobs, built-in ovens, washer-dryers, and instant water heaters should not share a circuit with general power sockets. Your electrician will assess what dedicated circuits your new kitchen and bathroom layouts require.
Ceiling fan and air conditioning points: If you are changing fan or aircon locations, the wiring needs to move too. Ceiling fan installation requires a specific wiring configuration and a proper mounting bracket secured to the concrete ceiling.
Concealed wiring: Most homeowners want wiring hidden inside walls and ceilings for a clean finish. This concealment work must be done during the first-fix phase, before plastering and painting.
Working with your interior designer's electrician
In Singapore's renovation ecosystem, the interior designer (ID) typically manages the overall project and engages subcontractors for each trade, including electrical. This arrangement works well when everyone communicates clearly, but it can create issues when they do not.
One point worth understanding up front: HDB renovation applications must be submitted via the HDB e-Renovation/APEX system by a contractor listed on HDB's Directory of Renovation Contractors (DRC). An ID can coordinate the paperwork, but unless the ID firm itself holds DRC registration, the actual submission is filed by a DRC-registered renovation contractor, usually the one doing the hacking and main renovation works. For the electrical portion specifically, the work must be performed by a Licensed Electrical Worker regardless of who files the renovation permit. Ask your ID early on whether they are DRC-registered, or which DRC contractor will be submitting on your behalf.
Here is how to make the coordination work smoothly.
Get involved in the electrical planning early. Do not leave it entirely to your ID. Walk through the floor plan and mark where you want power points, light switches, and data points. Think about furniture placement, appliance locations, and charging spots. Changes after the first-fix wiring phase are expensive because walls may need to be reopened.
Ask about the electrician's credentials. Your ID's electrical subcontractor should be a Licensed Electrical Worker. Ask for their licence number and the grade they hold. For HDB renovation work, an Electrician-grade LEW covers most residential installations. You can verify the licence through the EMA ELISE portal. Read more about what electricians in Singapore do to understand the scope of work.
Attend the electrical marking out. Most electricians offer a marking-out session where they visit the site and physically mark power point and switch locations on the walls before cutting begins. Attend this session. It is much easier to move a marking than to re-route wiring after the fact.
Get a separate electrical quotation. Even if the electrical work is part of your overall renovation package, ask for the electrical component to be itemised separately. This lets you understand what you are paying for and compare it against independent quotes if needed.
LEW requirements for renovation electrical work
Not all electrical work requires the same level of licensing, but most renovation work falls under the scope of a Licensed Electrical Worker.
Work that requires a LEW:
- DB box replacement or upgrade
- New circuit installation
- Full or partial rewiring
- Changes to the main switch or incoming supply
- Any work that requires testing and certification
Work typically within LEW scope but sometimes done by general electricians:
- Power point additions within existing circuits
- Light fitting installation
- Ceiling fan installation
The safest approach is to ensure all your renovation electrical work is done by a LEW. This gives you a single point of accountability and proper certification for the entire electrical scope. If your flat or property is later inspected for any reason, having LEW certification for all work provides clear documentation.
For licensed electrical works during renovation, the LEW will typically provide a completion certificate and test results showing that the installation meets the required safety standards.
Renovation electrical timeline and sequencing
Electrical work does not happen in one go during a renovation. It is spread across the project timeline, and the sequencing matters.
Week 1-2: Planning and marking out Before any physical work begins, the electrical plan should be finalised. The electrician marks out all power point, switch, and light fitting locations on the walls and ceilings. This is your last easy chance to make changes.
Week 2-3: First-fix (rough wiring) After hacking is complete but before plastering, the electrician lays all concealed wiring inside walls and ceilings. Cables are routed through PVC conduits embedded in the walls. Junction boxes for power points and switches are set in place. This phase must be completed before the plasterer arrives.
Week 4-6: Other trades While tiling, carpentry, and painting happen, the electrical work pauses. The wiring is safely embedded in the walls, waiting for the second fix.
Week 6-7: Second-fix (final connections) After painting is complete, the electrician returns to install all switches, power sockets, light fittings, and fans. The DB box is connected and tested. This is when everything comes alive.
Final day: Testing and handover The LEW tests every circuit for continuity, insulation resistance, and earth fault loop impedance. The RCCB trip time is verified. You receive a test certificate confirming the installation is safe.
Common renovation electrical mistakes to avoid
These mistakes come up regularly. Avoiding them saves money and frustration.
Not planning enough power points. The most common regret after renovation is not having enough power points. Modern homes need more sockets than you think. Consider USB charging points, kitchen countertop appliances, study area equipment, and bedside charging. Adding points after the renovation means surface-mounted wiring or reopening walls.
Forgetting about data and network points. While Wi-Fi covers most needs, dedicated ethernet points for your router, smart TV, and home office provide more reliable connections. Running network cables is easy during renovation but expensive afterwards.
Skipping the DB box upgrade. If your flat is more than 15 years old and you are doing a full renovation, skipping the DB box upgrade is a false economy. The electrician is already there, the walls are open, and the cost of doing it now versus as a standalone job later is significantly less.
Not coordinating with the aircon installer. Air conditioning and electrical work overlap significantly. The aircon installer needs power points in specific locations, and the electrical capacity must support the units. Ensure your electrician and aircon installer communicate directly, not just through the ID.
Choosing the cheapest quote without checking credentials. A renovation electrician who quotes significantly below market rate may be cutting corners on materials, licence coverage, or testing. Ask for their LEW details and check their credentials. Read our guide on how to choose the right electrician for more tips.
Frequently Asked Questions
Do I need a separate electrician for HDB renovation?
It depends on the scope of work. If your interior designer has an in-house electrician or a preferred subcontractor, they may handle the electrical portion as part of the renovation package. However, there are good reasons to consider engaging a separate electrician. A dedicated electrical contractor can provide more focused attention on the electrical scope, and you can verify their licensing independently.
For any work that requires LEW certification, such as DB box replacement, new circuit installation, or changes to the main electrical supply, you want to be sure the person doing the work holds the correct licence. Some interior design firms subcontract to electricians who may not hold the appropriate LEW grade for every type of work.
Having your own electrician also gives you a direct line of communication for any electrical issues that arise after the renovation, rather than going through the ID as a middleman. If you choose to use your ID's electrician, ask for their LEW licence number and verify it through the EMA registry. Our HDB residential LEW services cover the full range of renovation electrical work with proper certification.
What electrical work requires HDB approval during renovation?
HDB requires approval for several categories of electrical work during renovation. Any changes to the electrical supply, including upgrading the main switch capacity or adding new circuits to the distribution board, need to go through the proper channels. Relocation of the DB box itself requires approval. Hacking of walls or floors that involves rerouting concealed electrical cables must be declared in your renovation application.
Installation of high-power appliances like electric vehicle chargers or commercial-grade kitchen equipment may also require supply upgrades that need SP Services involvement. Standard renovation electrical work such as adding power points, relocating switches, installing lighting, and replacing the DB box like-for-like typically falls within the scope of your renovation permit and does not need separate electrical approval, provided it is carried out by a licensed professional.
The key distinction is between work that changes the overall electrical infrastructure versus work within the existing capacity. Your electrician should be able to advise which category your planned work falls into. For a detailed breakdown of HDB electrical requirements, check our compliance guide.
How much does renovation electrical work cost in Singapore?
Renovation electrical costs vary significantly based on the scope of work and the type of property. For a typical HDB flat renovation, electrical work typically accounts for a meaningful share of the overall renovation budget, often cited in the region of 10 to 15 percent, though the actual proportion depends heavily on scope. The figures below are typical market ranges based on contractor quotes we see, not official rates.
Typical renovation electrical ranges:
- Power point additions: around S$80 to S$150 per point, depending on wiring distance and concealment
- Light point additions: around S$60 to S$120 per point
- Full DB box replacement: around S$350 to S$800 depending on circuits
- Complete rewiring (4-room HDB): around S$2,000 to S$5,000
- Ceiling fan installation points: around S$100 to S$200 each
These are indicative ranges and your actual costs will depend on the complexity of wiring routes, concealed versus surface wiring, new circuits required, and whether supply upgrades are needed from SP Group. Always get an itemised quotation from your electrician before work starts, and be wary of lump-sum quotes that do not break down individual items.
Can my interior designer handle electrical permits?
Your interior designer can coordinate the renovation permit process, but there is an important detail many homeowners miss. HDB renovation applications must be submitted through the HDB e-Renovation/APEX system by a contractor listed on HDB's Directory of Renovation Contractors (DRC). An interior designer who is not DRC-registered cannot file the application directly.
In practice, the ID coordinates the paperwork and manages the project, but the actual submission goes through a DRC-registered renovation contractor, typically the one handling the hacking works. Some larger ID firms hold DRC registration themselves, in which case they can file directly. Ask your ID upfront whether they are DRC-registered or which DRC contractor will be submitting on your behalf.
Separately from the renovation permit itself, the actual electrical work must be performed by a Licensed Electrical Worker (LEW), not the interior designer. For the electrical component, IDs typically engage an electrician (either in-house or subcontracted) who holds the appropriate LEW licence. The LEW is the person legally responsible for the quality and safety of the electrical work, and they issue the compliance certification.
Where it gets important is ensuring the ID's electrician actually holds the correct LEW grade for the work being done. Electrician grade covers most residential work, but more complex installations may require a higher grade. Ask your ID to provide the electrician's licence details and verify them yourself via the EMA ELISE portal. If your renovation involves significant electrical changes, consider speaking directly with the electrician about the scope rather than relying solely on the ID to relay information.
What happens if electrical work is done without a LEW?
Electrical work performed without a Licensed Electrical Worker carries serious consequences. Under Singapore's Electricity Act, carrying out electrical installation work without the proper licence is an offence. The penalties can include fines and, in severe cases, imprisonment.
Beyond legal consequences, unlicensed electrical work creates real safety risks. Incorrect wiring can cause electrical fires, electric shock, or damage to appliances and equipment. Insurance is another concern: if an electrical fault causes damage to your property or a neighbouring unit, your insurance company may deny your claim if the work was done by an unlicensed person.
For HDB flats specifically, HDB can take enforcement action against homeowners who allow unlicensed electrical work in their flats. This can affect your ability to sell or sublet the flat in the future. The practical advice is straightforward: always verify that the person doing your electrical work is a licensed LEW. The cost difference between licensed and unlicensed work is small compared to the potential consequences.
How long does renovation electrical work take?
The timeline for renovation electrical work depends on the scope. For a typical HDB flat renovation involving rewiring, new power points, lighting changes, and a DB box upgrade, the electrical work often takes around 3 to 5 working days spread across the renovation timeline, though this varies with scope and site conditions.
The work happens in phases. First-fix wiring, where cables are laid inside walls and ceilings before plastering, generally takes 1 to 2 days and must happen early in the renovation. Second-fix work, connecting switches, sockets, lights, and fans to pre-laid wires, happens towards the end after painting. This also typically takes 1 to 2 days. DB box replacement and testing is often completed within half a day or so during the second fix, though heavier jobs can run longer.
If your renovation involves more complex work like full rewiring, new circuits for high-power appliances, or supply upgrades through SP Group, the electrical timeline will be longer. SP Group supply upgrade applications typically take a few weeks for processing alone, with the exact duration depending on case complexity. Coordination with your interior designer is essential to ensure the electrician's schedule aligns with the other trades.
Getting your renovation electrics right
Electrical work during renovation is one of those things that is easy to get right with proper planning and hard to fix after the fact. Start thinking about power points and lighting early in the design process, verify your electrician's credentials, and do not skip the DB box upgrade if your flat needs one.
The small investment in getting the electrical scope properly planned and professionally executed pays off every time you plug in an appliance, flip a switch, or simply enjoy a well-lit home that works exactly as you envisioned.
For renovation projects that need licensed electrical works, our team handles everything from first-fix wiring through to final testing and certification. For interior designers looking for a reliable electrical subcontractor, we provide the responsive scheduling and LEW compliance your projects require.
