How Long Does HDB Renovation Take? Singapore Timeline 2026 (BTO & Resale) 🔍 An HDB renovation in Singapore takes 8–10 weeks of on-site works for a BTO flat and 10–14 weeks for a resale flat in 2026. Add 2–4 weeks for design, quotation and permit approval beforehand. Most homeowners should plan 3 to 4 months from first consultation to move-in, longer if the flat needs full rewiring or major hacking. “How long will this take?” is the second question every homeowner asks us,