The contractor quoted 8 lakhs. Four months later, you have spent 15 lakhs and the work is still not finished.
This is not because the contractor is dishonest or you made bad decisions. It is because the building itself had problems nobody discovered until the walls were opened.
The one step that prevents this: structural and waterproofing assessment before design starts.
What Happens Inside the Walls During a Typical Renovation
You decide to renovate a bathroom or redo a kitchen. The designer shows you pretty 3D renderings. The contractor gives you a quote. Work starts.
Then the contractor opens a wall and finds:
— Rusted rebar in the column beside the kitchen
— Moisture in the concrete behind the bathroom tiles
— Cracks in the structural slab (now visible because the plaster was removed)
— Leakage from the flat above seeping into the wall structure
— Old waterproofing that has failed
Suddenly, the scope changes. Before you can put new tiles or paint, you need to fix concrete, treat rust, repair waterproofing, resolve seepage. The budget balloons. The timeline extends.
And the new kitchen or bathroom you spent weeks designing sits incomplete while these “unexpected” structural issues are addressed.
This happens in roughly 70% of Mumbai flat renovations — not because the builder was negligent, but because nobody looked inside the walls before designing.
The Civil-First Approach
PS Design Studio’s method is to reverse the order:
**Step 1 — Structural and Waterproofing Assessment**
Before any design sketch is drawn, send a structural engineer and waterproofing specialist into the flat. They assess:
— The condition of the concrete structural elements (columns, beams, slabs)
— Any active or historical leakage or seepage
— The state of waterproofing in wet areas (bathrooms, kitchen)
— The condition of pipes, drainage, and utility penetrations
— Any cracks or signs of structural movement
This takes 1–2 hours and costs a few thousand. The output is a written report of what is sound, what is failing, and what must be addressed before renovation.
**Step 2 — Fix structural and waterproofing issues**
Any structural cracks are stitched. Any failing waterproofing is replaced. Any corrosion is treated. This is done BEFORE any finishes are touched.
**Step 3 — Then design around a clean slate**
Now the interior designer works with a building that is structurally sound and dry. Design decisions are not constrained by hidden damage. Timelines are predictable. Budgets do not balloon.
What This Costs vs. What It Saves
A pre-renovation structural and waterproofing assessment: typically Rs 5,000–10,000 depending on flat size.
The cost of discovering major issues mid-renovation and then fixing them: typically 2–4 lakhs in delay costs, change orders, extended contractor timelines, and project disruption.
If the assessment prevents even one mid-renovation discovery, it has paid for itself hundreds of times over.
A Real Example
2BHK in Andheri. Owner wants to redo the bathroom and kitchen — original budget Rs 10 lakhs.
Pre-renovation assessment finds:
— Leakage from the common terrace seeping into the wall behind the kitchen
— Concrete spalling in the corner of the kitchen where a pillar meets the slab
— Failed waterproofing in the bathroom slab
The owner faces a choice: hide the issues and proceed with the kitchen renovation (which will fail within a year), or fix them first.
Fixing them adds 2.5 weeks and Rs 2.5 lakhs to the budget. The bathroom and kitchen renovation then proceeds smoothly, on schedule, on budget. Total cost: Rs 12.5 lakhs. Timeline: 8 weeks.
Without the assessment, the owner would have spent Rs 10 lakhs on a kitchen that gets wet again from the common terrace leak within 6 months. Remedial work to fix the real problem would then cost another Rs 4–5 lakhs. Total cost: Rs 14–15 lakhs. Timeline: 5 months of disruption + 2 months of remedial work = 7 months.
Civil-first costs slightly more upfront but saves massively in total cost and timeline.
What a Pre-Renovation Assessment Includes
— Visual inspection of structural elements (columns, beams, ceilings, walls)
— Moisture assessment in wet areas using moisture meters and thermal imaging
— Evaluation of existing waterproofing condition
— Plumbing and drainage review
— Electrical and utility penetration assessment
— Written report with photographs and recommendations
— Priority list of what must be fixed before finishes
This is standard practice in Mumbai’s high-end residential segment and should be standard everywhere.
Watch PS Design Studio’s flat renovation projects on the PS Group YouTube channel. See completed renovations in the PS Group gallery.
To book a pre-renovation structural and waterproofing assessment for your Mumbai flat, visit pscivil.com/design, call +91 97684 16600, or WhatsApp PS Group. For structural repairs, see pscivil.com/civil. For waterproofing, see pscivil.com/waterproofing.
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