Rear room, side wing or full upper floor — extending a landed home is the most cost-effective way to gain space without moving. Here is what it costs in Klang Valley.
A house extension in Klang Valley typically costs RM 150–350 per sq ft depending on scope, storey count and finishes. A 200 sq ft rear room addition runs roughly RM 30,000–70,000 all-in; a full upper-floor addition over a double-storey terrace can reach RM 150,000–300,000. All structural extensions require council approval and a structural engineer.
Indicative Klang Valley ranges — get a free quote on WhatsApp.
Landed homes in Malaysia can be extended in three main directions, each with different complexity and cost:
| Extension Type | Typical Size | Cost Range | Notes |
|---|---|---|---|
| Rear room (basic) | 100–200 sq ft | RM 18,000–50,000 | Brick walls, flat or sloped roof, simple finishes |
| Rear extension (full) | 200–400 sq ft | RM 40,000–120,000 | Includes tiling, electrical, plumbing if kitchen/bathroom |
| Side extension | 80–150 sq ft | RM 20,000–55,000 | Narrower footprint; foundation may need widening |
| Upper floor (single terrace) | 800–1,200 sq ft | RM 150,000–280,000 | Structural steel/RC frame, staircase, M&E works |
| Upper floor (semi-D) | 1,000–2,000 sq ft | RM 200,000–400,000 | Premium finishes, larger M&E scope |
Figures above are all-in estimates covering structure, roofing, basic M&E and plastered walls. Premium floor tiles, feature ceilings or bathroom pods add RM 15,000–40,000 more.
| Factor | Rear Extension | Side Extension | Upper-Floor Addition |
|---|---|---|---|
| Typical cost range | RM 18,000–120,000 | RM 20,000–55,000 | RM 150,000–400,000 |
| Disruption to daily life | Low–moderate | Low | High (roof opened) |
| Setback constraints | Council rear setback | Side setback 1.5–3 m | Height restrictions apply |
| Structural engineer needed? | For load-bearing works | Usually not | Always required |
| Council approval required? | Yes | Yes | Yes |
| Construction time | 4–10 weeks | 3–8 weeks | 12–24 weeks |
Extension costs split roughly as: structure & roofing 40%, M&E (electrical/plumbing) 20%, finishes (tiles, paint, carpentry) 30%, preliminaries & PE fees 10%.
Any structural extension to a landed home requires Kebenaran Merancang (planning approval) and a building plan submission to your local council (DBKL, MBPJ, MBSA, etc.) under the Street, Drainage and Building Act 1974 and the Uniform Building By-Laws (UBBL) 1984. Doing it without approval risks a stop-work order, a compound fine, and a demolition notice for the unauthorised structure.
| Phase | Duration |
|---|---|
| Design & drawings | 2–4 weeks |
| Council submission & approval | 4–16 weeks |
| Site work — rear/side extension | 4–10 weeks |
| Site work — upper-floor addition | 12–24 weeks |
| Finishes & snagging | 2–4 weeks |
At RM 150–350/sq ft, a 400 sq ft extension costs RM 60,000–140,000. Compare this to SDBA stamp duty, legal fees, agent commission (2–3% of the purchase price), moving costs and a price premium of RM 100,000–300,000 on a larger home in the same neighbourhood. For most families in Klang Valley, extending the existing home is significantly cheaper — especially when combined with a broader terrace house renovation →. You also stay in a neighbourhood you know, in a school catchment you have chosen, without the disruption of uprooting the family.
WhatsApp ClickBina with your property address and a rough sketch of what you want. We will visit the site, check your land title setbacks, and give you a detailed quotation covering structure, finishes and permit submission — all in one package.
Related guides: Renovation Permits → · Renovation Cost → · Terrace House Renovation →
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