Hidden Renovation Costs in Singapore: The Checklist

Site and preliminaries

Unglamorous, easy to omit from a quote, and guaranteed to be needed:

• •Haulage and debris disposal — commonly S$500–S$1,200 depending on volume and access
• •Floor and lift protection during works (condos usually require it)
• •Renovation permit applications and deposits
• •Post-renovation chemical cleaning

Electrical: the quiet budget-eater

First quotes often carry a token electrical line. Then the real count happens: every wall light, ceiling point, data point, and appliance socket is a point, and a 4-room home routinely needs 20–40. Adding points costs roughly S$800–S$1,500; a partial rewire S$1,800–S$3,000; a full rewire for older units S$3,500–S$6,000.

Cove and concealed lighting also needs false-ceiling access — if you want the light, you may also be buying the ceiling.

The carpentry interior you can't see

Two identical-looking wardrobes can differ by thousands based on what's inside: soft-closing hardware, internal drawers (each one costs more than a shelf), accessories trays, and internal material grade. If the quote only states feet run and external finish, the interior is undefined — and undefined means either basic or extra.

Wet works and the things behind them

Bathrooms and kitchens hide the most surprises:

• •Waterproofing when re-tiling bathrooms — necessary, sometimes quoted as an 'extra'
• •Plumbing relocation — moving a sink or WC outlet costs far more than replacing in place (indicatively S$800–S$2,500)
• •Sink, tap, and sanitary fittings — quotes often cover installation only, with supply on you
• •Hacking surprises in resale units: uneven screed, embedded pipes, moisture damage

The items everyone assumes someone else priced

Ask explicitly about each of these — they sit in the gap between renovation and 'moving in':

• •Doors: bedroom doors, toilet doors, or re-laminating existing ones
• •Glass and aluminium: shower screens, kitchen backsplash, mirror panels
• •Curtain pelmets and window treatments
• •Appliances and light fittings — supply is almost never in the renovation quote
• •Aircon: new units or trunking rework, especially in resale flats

Variation orders: the cost of deciding late

Most projects change once work starts — a socket moved, a material upgraded, a cabinet added. Individually small, variation orders commonly add 5–15% to a project. Two defences: decide as much as possible before work starts, and confirm in writing how variations are priced and approved before you sign.

A renovation pre-check helps precisely here: it puts numbers to your scope before you commit, so the gap between plan and reality is smaller.