Replacing a Timber Upper Floor with Concrete
Survey, Approvals, Order of Works & Cost (2026)

Where timber upper floors are still found

Timber upper floors are part of the Malaysian housing story. Older shophouse rows in town centres, some early terrace houses, and many half-brick homes that kept the timber storey above a newer brick ground floor still stand on timber joists and boards. ClickBina's kampung house renovation guide describes that half-brick route, where the timber upper floor is deliberately kept and the wet areas move into masonry below.

A timber floor that is dry, level and free of termites can last for generations. The question this page answers is what to do when it is no longer sound, or when the owner wants to put bathrooms, heavy furniture or a new use upstairs that a timber floor was never meant to carry.

Signs the floor is failing

• Bounce or sag when someone walks across the room, or furniture that rocks.
• Soft or spongy boards, especially near a bathroom, a kitchen sink or a window.
• Mud tubes, hollow-sounding timber or fine dust under the floor, which point to termites or wood-boring beetles.
• Water stains on the ceiling or the underside of the boards below a bathroom.
• Gaps opening between boards and walls, or doors upstairs that no longer close.
• Joist ends that are dark, crumbling or soft where they sit in the wall.

Joist ends deserve special attention. They sit in pockets in the brick walls, where damp from a leaking roof or gutter collects and rot starts unseen. A floor can look fine from above while the bearing ends have lost much of their strength.

Repair, strengthen or replace

Replacement is the largest of three possible answers. The right one depends on what the survey finds:

A concrete floor is heavier than the timber it replaces. That extra weight goes down through the walls and into the foundations, which were sized for the original house. This is why replacing a timber floor with concrete is an engineer's decision, not a contractor's, and why the answer is sometimes a lighter steel-and-concrete design or new timber rather than a full slab.

Start with the engineer's survey

A professional engineer looks at the whole load path, not just the floor. The survey usually covers:

• The condition of the joists, joist ends and any existing beams.
• The walls that carry the floor: brick quality, cracks, and whether they are shared with a neighbour.
• The foundations, as far as they can be inspected, and signs of past settlement.
• The roof and gutters above, because a leak is often why the floor rotted.
• What the new floor must carry: bathrooms, a kitchen, a library, a tuition class or ordinary bedrooms.

The engineer then proposes the structure, prepares drawings and calculations, and specifies how the existing floor is propped during the works. The wall hacking guide makes the same point for walls: anything structural needs a professional engineer's written confirmation before anyone starts removing it.

Approvals, neighbours and older buildings

Structural work generally needs council approval, with the engineer's drawings forming part of the submission. The renovation permit guide explains what a typical submission contains and who signs it. Rules and fees differ between local authorities, so confirm with yours early.

Two situations need extra care. In a terrace or shophouse row the beams often bear on party walls shared with neighbours, so they need to be told and their side protected. And older shophouses, especially rows in town centres, can sit in conservation areas with their own conditions; the shophouse upper floor guide covers what to check before designing anything for those buildings.

The order of works

1. Survey, design, drawings and approval, then a written scope and programme.
2. Clear the upper floor and the room below; protect stairs, neighbours' walls and anything staying.
3. Install temporary props as the engineer specifies before removing any structure.
4. Strip the boards and joists in the sequence agreed, and treat any termite activity found.
5. Form the new beams and slab, or fit the steel and deck, as drawn; let concrete cure before loading it.
6. Run new wiring, plumbing and drainage while the structure is open.
7. Screed, waterproof the wet areas, and finish the floor and the new ceiling below.

Removing the timber floor exposes the ceiling of the room below and often the wiring that ran between the joists. Older houses frequently need rewiring anyway, so it makes sense to do it while the floor is open rather than chasing walls later.

Bathrooms and kitchens upstairs

Water is the most common reason a timber upper floor fails. Bathrooms and sinks built on timber boards leak a little every day, and the rot is hidden until the floor gives way. A concrete floor makes it possible to build a proper upstairs bathroom: a slab that falls to the drain, a waterproofing membrane, and a floor trap set into the structure.

If the plan is to add bathrooms upstairs, tell the engineer at the start. Bathroom areas carry more weight, need drainage routes down through the house, and may need a slightly lower slab so the finished floor is level with the rooms around it.

Termites and the timber you keep

A timber floor that has been eaten by termites is evidence of a colony that is still nearby. Treat the colony first, then remove and replace the damaged timber; otherwise the new timber in the stairs, door frames and roof is simply fresh food. The termite damage repair guide explains the treat-first, repair-second order, and the roof truss replacement guide covers the roof timbers that are often affected at the same time.

Living with the works

Removing a floor is noisy, dusty and disruptive, and the rooms above and below are out of use until the new floor has cured and been finished. Most owners move out, or move to rooms well away from the works. The moving out during renovation guide covers storage and short stays. Ask for a written programme that shows when the structure will be open, when concrete is poured, and when the rooms will be usable again.

What drives the cost

A floor replacement is priced from the engineer's design, so there is no honest per-square-foot figure before the survey. These related items are published on ClickBina's guides (indicative 2026, Klang Valley) and show the scale of the main pieces around the structure:

The structure itself, the propping, any work to walls or foundations, and making good the ceiling below are priced once the engineer's design is known.

How ClickBina can help

WhatsApp us your job details for a quote: the type of house, roughly how big the upper floor is, what is wrong with it, and what you want to use it for. ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment and trade coordination, so the engineer's design, approvals, termite treatment, wiring, plumbing, bathrooms and finishes can be planned as one job. The structure is designed by a professional engineer first, and we will say so. We reply within the hour, and the price agreed is a flat price with no hidden charges. A site visit is RM150, waived if you go ahead.

Sources & methodology

• ClickBina kampung house renovation guide — half-brick route, timber floors and water, drawings, termite and rewiring prices.
• ClickBina termite damage repair and roof truss guides — treat-first order, baiting and roof timber prices.
• ClickBina old house renovation and shophouse upper floor guides — floor tile and bathroom prices, older shophouse checks.
• ClickBina wall hacking, renovation permit and moving out guides — structural confirmation, approvals and living arrangements.

Methodology: every RM figure on this page is quoted unchanged from the ClickBina guide named beside it; they are indicative Klang Valley ranges for 2026, not fixed rates.