Journal · 1 min read
The Hidden Costs of an Interior Project Nobody Warns You About
The costs that rarely appear in the first quote, so you can budget for them from day one.
2026-04-12
Hidden costs in an interior project often add up to 10 to 20 percent of the main budget. The usual suspects are moving fees up the building, common-area charges during work, added systems work, mid-project change orders, and VAT. Reserve a contingency from the start so nothing stalls.
Building and access charges
Many condos have rules and fees that hit the budget directly. Always check with the building's management before work begins.
- Renovation deposits and move-in or move-out fees
- Restricted work hours that stretch the schedule and labour
- Service-lift fees and protecting floors and corridors
- Debris disposal, since some buildings ban dumping on-site
Costs that appear on site
Once the old finishes come off, you often find things that must be fixed: walls out of square, uneven floors, or existing pipes and wiring below standard. These fixes are not in the first quote because they are invisible until work starts, so leave room for them.
End-of-project costs people forget
Near the finish line, more charges land: a big post-construction clean, curtains and blinds, small decor pieces, and utilities used during the build, plus VAT that some quotes have not yet included.
How much contingency should I set aside?
For fitting out a fresh unit, 10 percent is enough. For renovating something old with more unknowns, set aside 15 to 20 percent, since the odds of on-site surprises are higher.
What should a good quote spell out to reduce hidden costs?
It should name the scope clearly, material models and brands, explicit exclusions (like curtains and appliances), terms for extra work, and whether tax is included. The more detailed the quote, the fewer surprises.