HDB resale renovation timeline: what to expect, week by week

SparkFlow's current planning range for an HDB resale renovation is 6–12 weeks across flat sizes, with 7–9 weeks for a 4-room as at 31 July 2026. The signed programme should say exactly when that clock starts and what can extend it.

The sequence below is an illustrative 4-room programme. Design, selection and approval tasks can overlap, while demolition cannot begin until the necessary HDB approval is in place. Fabrication, hidden conditions and written variations can move the dates.

The headline timeline

These are SparkFlow planning ranges as at 31 July 2026, subject to the scope, access and approvals stated in the quote:

Ask whether the quote measures from design sign-off, permit approval or site possession. That definition matters more than a headline duration.

Before site week 1: design and approvals

Finish the measured layout, work schedule and material decisions, then let the contractor listed in HDB's Directory of Renovation Contractors identify which works need a permit or notice. Planning can begin before legal completion, but do not assume the renovation submission can.

The pre-construction checklist should cover:

• Authorised site measurement and an existing-condition record.
• Existing and proposed plans with the demolition scope clearly marked.
• HDB permit or notice submissions by the DRC-listed contractor.
• Electrical assessment and drawings or applications by an EMA-licensed electrical worker where required.
• Approved materials, fixtures, paint system and carpentry finishes.
• A signed line-itemed quote, payment schedule and programme.

HDB's renovation-permit guidance explains that the DRC-listed contractor submits the application. HDB does not publish the universal $50–$200 "permit fee" sometimes quoted online; require the contractor to itemise its own administration, professional, haulage and Town Council charges instead.

Site week 1: approved demolition and strip-out

The approved scope may remove old built-ins, tiles, ceilings, fittings or permitted non-structural partitions. It does not automatically strip every resale flat to a shell. Photograph retained elements, protect common areas and confirm debris routes before work starts.

What gets hacked:

• Existing built-ins specifically marked for removal.
• Wall or floor finishes included in the approved work schedule.
• Ceiling boards only where replacement is in scope.
• Partitions only where HDB approval or conditions allow the work.
• Kitchen and bathroom fittings being replaced.

HDB's current renovation terms and conditions limit noisy work such as wall or floor demolition to 9am–5pm, Monday to Friday, for no more than three consecutive days. Noisy work is prohibited on Saturdays, Sundays, public holidays and the eve of major public holidays. General non-noisy work has a separate 9am–6pm window on weekdays and Saturdays. The contractor must also give the required neighbour notices; courtesy does not replace the rules.

Do not plan to occupy the flat during demolition or whenever safe access, sanitation, power or water is unavailable. Treat it as a controlled work site and arrange visits with the contractor.

Site weeks 2–3: assessment, first-fix and wet works

With the relevant areas exposed, qualified trades assess the existing installation and complete approved concealed services before finishes close them in. Some tasks are quieter than demolition, but drilling and cutting still follow HDB's noise conditions.

What happens during rough-in:

Electrical. Age alone does not prove that a flat needs full rewiring or a distribution-board replacement. An EMA-licensed electrical worker should assess the approved load, wiring condition, earthing, residual-current protection and circuit requirements, then design and test the work that is actually needed. EMA explains how to engage a licensed electrical worker.

Singapore's code of practice is SS 638; EMA's SS 638 adoption circular is the official reference point. Do not prescribe a main-rating or board upgrade from the flat's age alone, and do not treat a company workhead as a substitute for the LEW's assessment. If the assessment calls for rewiring or a board upgrade, put the circuits, protective devices, testing and certification in the written scope.

Plumbing. Inspect the material, condition, leaks, valves, drainage falls and proposed routes. Replace or reroute only what the assessed layout and condition require, using approved materials and qualified trades. Coordinate any water-heater replacement with the plumbing and electrical scopes rather than treating it as an isolated appliance swap.

Waterproofing. Do not assume every old bathroom membrane has failed. Inspect for leakage and define the approved method. Where a bathroom floor is hacked, rebuild the wet-area system to HDB conditions, with the specified substrate, membrane or screed, tests and warranties. Kitchens are different: HDB's ceiling-leak guidance says there is generally no waterproofing membrane beneath kitchen floor tiles, so a kitchen screed requirement should not be described as a bathroom-style membrane.

Site weeks 4–7: rebuilding and finishes

Once concealed services and required tests are complete, the team closes surfaces and installs the visible work. The exact overlap depends on drying, fabrication and access.

Wet-area substrate work and tiling generally precede fixed carpentry. Base cabinets are installed before a made-to-measure countertop is templated; fabrication time then becomes part of the programme. Painting preparation and early coats may happen before carpentry, with final coats and touch-ups sequenced to avoid damage. The written post-renovation painting scope should state the areas, primer, product and coat count rather than relying on a blanket promise.

Aircon installation must be coordinated earlier for routes, drainage, power and access even if indoor units are fitted late. Record whether the renovation or aircon contractor owns piping, trunking, concealment, testing and making good.

Site weeks 8–9: testing, snagging and handover

Allow time for trade tests, cleaning, an owner inspection and agreed rectification. Record each defect with a photograph, location, owner, target date and closure status. Do not make the final handover date depend on an unsupported promise that every item will close within one week.

Cosmetic examples include paint touch-ups, cabinet adjustment and grout cleaning. Treat electrical, plumbing, waterproofing, fire-safety and structural concerns as safety or compliance items, not ordinary cosmetic snags.

The contract should state warranty scope, exclusions, start date and response process. Rely on the warranty written into the signed SparkFlow proposal for that project.

What can extend the timeline

The 6–12 week ranges above assume the stated scope. Things that can add weeks:

Asbestos in old vinyl tiles or ceiling boards.It cannot be confirmed safely by visual inspection. MOM says buildings constructed after 1 January 1991 are unlikely to contain asbestos, while a suspected material should be assessed by an asbestos surveyor. Read MOM's asbestos guidance before disturbing it; confirmed removal must use an approved asbestos removal contractor. Survey, notification and removal time and cost are quote-specific.

Customer-supplied materials with long delivery.Tiles from Taobao, designer fittings from overseas, custom carpentry from a specific brand — anything that takes weeks to arrive can hold up the phase that needs it. Put required-on-site dates, inspection responsibility and a realistic delivery buffer in the programme before ordering.

Scope changes mid-project. "Actually, can we move the kitchen island a metre to the left?" — yes, but electrical and plumbing first-fix may already be done. Ask for the written cost and programme effect before approving the variation.

Approval timing. Do not schedule demolition before the required HDB approval. If approval takes longer than the programme allowance or HDB asks for revisions, move the affected start date rather than proceeding at risk.

How to plan the move

The most stressful part of resale renovation in Singapore is often the move logistics — you're selling your old place, the buyer wants completion on a fixed date, and your new place is being renovated.

A few practical tips:

Start decisions before key collection. You can finalise the brief, review the floor plan, shortlist materials and flag long-lead items before completion. A site measure and HDB permit submission depend on access, ownership or owner authorisation and portal prerequisites, so have the DRC-listed contractor confirm when each step is allowed.

Build in a buffer week between renovation end and your move-in date. Things sometimes overrun by a few days. Booking the movers for the week after the planned handover, rather than the day after, saves a lot of stress.

Map the sale, purchase and temporary-accommodation dates.Discuss permissible completion arrangements with your property agent and conveyancing lawyer rather than assuming the renovation can bridge a tight gap. Price storage, movers and a fallback stay before committing to a move date.

Why resale renovation costs more than BTO

A resale quote may be higher because it starts with an existing fit-out and services rather than an untouched new-flat scope. Possible extra work includes:

1. Approved removal, protection, haulage and disposal for finishes or built-ins being replaced.
2. Repairs revealed after strip-out and any electrical upgrade an EMA-licensed electrical worker determines is necessary.
3. Bathroom wet-area rebuilding where hacking or the assessed condition requires it.

SparkFlow's planning ranges as at 31 July 2026 are $50,000–$80,000 for a 4-room resale and $35,000–$55,000 for a 4-room BTO. Those bands overlap, so do not turn them into a universal percentage premium. Compare an assessed, like-for-like scope.

The short version

For an HDB resale renovation in Singapore, plan for:

• Before site week 1: design, selections, quote and required approvals.
• Site week 1: approved demolition and strip-out, with noisy work limited to HDB's three-consecutive-day rule.
• Site weeks 2–3: assessment, concealed services and wet works.
• Site weeks 4–7: substrates, tiling, ceilings, carpentry, counters, paint and coordinated installations.
• Site weeks 8–9: testing, cleaning, snagging and handover.

Smaller or tightly scoped projects can finish sooner; larger flats, asbestos controls, hidden conditions, scope changes and delayed owner-supplied items can take longer. Finalise decisions early, but let ownership, HDB approval and safe sequencing determine the site start.