House Extension Cost Malaysia 2026: Ground Floor, Second Storey & Kitchen Extension Price Guide

House Extension Cost in Malaysia: The Complete 2026 Guide

Running out of space but love your location? Extending is almost always cheaper than upgrading to a bigger landed property — if you scope it properly. But house extensions are also where the most money quietly leaks: foundation work, council submission fees, and structural engineering that “cheap” quotes pretend don't exist. After delivering 70+ extensions on terrace, semi-D and bungalow homes across the Klang Valley, here's the honest 2026 cost breakdown — including the line items most quotations conveniently leave out.

Quick Answer: How Much Does a House Extension Cost?

Skip the “it depends” non-answer. The typical landed homeowner in the Klang Valley spends RM90,000 - RM180,000 on a ground-floor extension — the most common job we do. Here is how that splits by size and type (2026 prices):

• Small ground-floor extension (kitchen/dining, 100-180 sq ft): RM55,000 - RM95,000
• Standard ground-floor extension (family area + wet kitchen, 180-320 sq ft): RM90,000 - RM180,000
• Large / double-volume ground extension (320-500 sq ft, glazing, high ceiling): RM180,000 - RM280,000
• Second-storey extension (build a new floor over the existing ground floor): RM200,000 - RM350,000

Per square foot: budget RM320-420/sq ft for a finished, council-approved extension. Anything quoted below RM250/sq ft has something missing — usually the foundation or the submission (more on that below).

Why Extensions Cost More Per Sq Ft Than a Normal Renovation

A repaint or re-tile reuses the existing shell. An extension creates new building — so you pay for everything from the ground up:

• New foundation: pad/strip footings, piling on soft soil (common in reclaimed Klang Valley land)
• Structure: reinforced concrete columns, beams, floor slab, and roof — not just a wall
• Tying into the existing house: demolishing part of an external wall, matching floor levels, and waterproofing the joint so it does not leak in year two
• Authority submission: a Professional Architect or Draughtsman, plus a structural engineer's endorsement, is legally required for most extensions

Ground Floor vs Second Storey: Which Is Cheaper?

Most homeowners assume building up is cheaper because “the land is already there.” It is usually the opposite.

• Ground-floor extension is generally cheaper per sq ft (RM320-400) — simpler access, no need to reinforce what is below.
• Second-storey extension runs RM400-520/sq ft because the existing ground-floor columns and foundation often cannot carry the new load. Strengthening them — or in older houses, rebuilding them — is the single biggest hidden cost.
• You also lose the use of the rooms below for weeks, and the existing roof must be removed and rebuilt.

Rule of thumb: if you have side or rear land, extend outwards first. Build up only when you have run out of footprint.

Kitchen Extension: The Most Popular (and Most Mis-Quoted) Job

The classic Malaysian wet-and-dry kitchen extension — pushing the kitchen into the rear air well or back garden — typically runs RM55,000 - RM140,000 depending on size, glazing, and whether you relocate plumbing and the gas line.

Cheap quotes hit this number by excluding: the new concrete slab and roof, rerouting the kitchen drainage to the existing manhole, waterproofing the new floor, and the council submission. When those reappear mid-project, the “RM60k” kitchen becomes RM110k.

Council Approval & Submission Fees (Don't Skip This)

An unapproved extension is illegal, can be ordered demolished, and will block your sale or refinancing later. Budget for the paperwork:

• Architect / Draughtsman drawings & submission: RM5,000 - RM18,000 depending on complexity
• Structural engineer endorsement: RM3,000 - RM10,000
• Local authority processing fees (DBKL, MBPJ, MBSA, MPS etc.): RM1,000 - RM5,000+ depending on built-up area
• Timeline: 2-6 months for approval before a single brick is laid — plan for it.

Red Flags in an Extension Quote

• No submission/approval line item. Means they intend to build illegally — or will charge you later.
• No structural engineer fee. Not optional for an extension. Its absence means the quote is incomplete.
• “Foundation TBD” or soil works excluded. The single largest cost variable, left open to revise upward.
• Price per sq ft under RM200 for a built extension. Physically impossible to deliver to spec in 2026.

Get an Extension Quote That Actually Holds

At RenoWise, we specialise in landed-property extensions across the Klang Valley. Every quote includes the foundation allowance, structural engineering, authority submission, and the tie-in waterproofing — the four things low-ball quotes hide — so you are not surprised three weeks in.

Chat with us for a scoping visit on your house. We'll assess your soil, existing structure, and council requirements, then give you a fixed quote with nothing left “TBD.”