What each actually delivers
| Deliverable | Contractor only | Designer or design-and-build studio |
|---|---|---|
| Measured survey and drawings | Rarely | Always |
| Layout and space planning | No | Yes |
| Material and finish specification | Suggests what he buys | Specified by component with standards |
| 3D visualisation | No | Usually |
| Services coordination — electrical, plumbing, AC | Trade by trade | Coordinated on one drawing set |
| Procurement | For his own trades | Whole scope, with invoices |
| Programme and sequencing | His own work | All trades, to a dated programme |
| Society liaison and permissions | Sometimes | Yes |
| Single point of accountability | No | Yes |
| Snagging and handover | Informal | Documented list and sign-off |
The cost difference, quantified
| Scope | Contractor-led | Design-and-build | Difference |
|---|---|---|---|
| 2BHK, like-for-like refresh | ₹8 – 12 lakh | ₹10 – 15 lakh | 20 – 25% |
| 2BHK, layout changes and new joinery | ₹12 – 18 lakh | ₹15 – 22 lakh | 18 – 22% |
| Single kitchen replacement | ₹3 – 5 lakh | ₹3.5 – 5.5 lakh | 10 – 15% |
| One bathroom | ₹1.8 – 3 lakh | ₹2 – 3.4 lakh | 10 – 14% |
| 3BHK turnkey with services moved | ₹18 – 28 lakh | ₹23 – 34 lakh | 20 – 25% |
The percentage narrows as the scope narrows. On a single element it is small; on a full home with services moving it is at its widest and also at its most useful.
Where the money goes when it goes wrong
The contractor-only route works well until something needs deciding that nobody was appointed to decide. Four recurring examples from Mumbai flats:
- Electrical points set before the furniture layout. Sockets behind a wardrobe, a switch on the hinge side of a door, no point at the bedside. Moving them after plastering costs ₹1,500–3,000 each plus making good.
- False ceiling boarded before the AC drain was pressure tested. The ceiling is opened in month two.
- Counter templated from the drawing rather than the installed carcasses. A wedge of silicone along the back edge, or a slab that has to be re-cut.
- Tiling laid before the shower valve depth was confirmed. Trim that stands proud of the tile, and no way to correct it without breaking the wall.
- None of these are contractor failures. Each is a coordination decision that was nobody’s job.
When contractor-only is genuinely correct
- The layout works, the storage is adequate, and nothing moves. Replacing a kitchen in the same footprint with the same services is a contractor’s job.
- A single trade scope — painting, flooring replacement, one bathroom.
- You have drawings already, from a previous project or an architect, and somebody needs to build them.
- You have the time and the temperament to be on site and make decisions daily. This is a real qualification and some clients have it.
- You have worked with the contractor before and know his standard. That relationship is worth more than any process.
What a contractor-only route needs from you
If you take the contractor route on a substantial scope, you are taking on the design and coordination role yourself. That is entirely doable, and these are the things it actually requires.
- A furniture layout before any electrical work. Every socket and switch position should be marked against where the bed, wardrobe and television will physically sit.
- A written specification. Board grades with standard numbers, hardware tiers with counts, tile classes, paint tiers and coat counts. Without these, the contractor will buy what is cheapest and will not be wrong to.
- A sequence. Which trade follows which, and what has to be tested before it is covered up. Concealed plumbing before tiling, refrigerant lines before boarding, and so on.
- Availability. Site decisions arise daily and a contractor who cannot reach you will make them himself.
- A contingency. Ten per cent, because coordination gaps cost money and somebody has to absorb them.
Verdict
| Your project | Appoint |
|---|---|
| One room, one trade, no layout change | Contractor |
| Kitchen replacement in the same footprint | Contractor, with a written specification |
| Full 2BHK with new joinery, same layout | Either — depends on your time |
| Layout changes or services moving | Designer or design-and-build |
| Occupied renovation with a society programme | Design-and-build |
| Commercial fit-out with a landlord manual | Design-and-build |
| You will be abroad during the works | Design-and-build, without question |
We will say the unhelpful-to-us thing plainly: if your layout is right and you are replacing like for like, hire a good contractor and save the fee. What a contractor cannot do is tell you that your brief is wrong, and on most full-home projects that is the service being bought.
Frequently asked questions
How much cheaper is a contractor?+
Fifteen to twenty-five per cent on a full home, narrowing to ten to fifteen on a single kitchen or bathroom. That is before counting the value of your own time on site and the cost of any rework caused by uncoordinated decisions.
Can I hire a designer for drawings only and a contractor to build?+
Yes, and it is a legitimate route. It works when the drawing set is complete, including electrical, plumbing and ceiling layouts, and when someone is available to answer site queries. It works badly when the designer disengages after the 3D renders.
What does a design-and-build studio do that a designer alone does not?+
Carries the execution. One contract, one programme and one party answerable when something does not fit. With a designer and a separate contractor, a clash on site becomes a discussion about whose scope it was, usually while you stand in the flat.
Is a contractor riskier?+
Not inherently. A good contractor with a clear specification produces excellent work. The risk is not the trade, it is the absence of a specification and of anyone whose job it is to sequence the trades. Supply both and a contractor route is sound.
What should I insist on either way?+
A written scope with board grades and standards named, a dated programme, a payment schedule tied to milestones rather than dates, and a snag list at handover. Those four documents protect you regardless of who you appoint.