The NKDA Drawing Set Explained, Sheet by Sheet

If you have a plot in New Town and you have started asking around about getting a building plan sanctioned, you have probably been handed a phrase that sounds simple and is not, which is "the drawing set". Somebody tells you the architect will prepare the drawings, you nod, and then a folder of sheets arrives that you cannot read, and you are being asked to sign it. That gap between what you are signing and what you understand is where most of the anxiety in this whole process lives, and it is entirely fixable, because the set is actually quite logical once somebody walks you through it sheet by sheet.

We are Studio Contour, an architecture and interior design practice working out of New Town, Kolkata since 2014, and we have delivered 330+ buildings across New Town, Salt Lake, Rajarhat and greater Kolkata, which means we have prepared and revised a lot of sanction sets. What we see over and over is that owners who understand their own drawing set ask better questions, catch problems while they are still cheap to fix, and end up with a house that matches what was in their head, so this piece is our attempt to explain the set the way we would explain it across our own table.

One thing to set straight at the start, because it comes up in almost every first meeting. The drawing set is not decoration and it is not a formality that some office stamps out of habit. It is the legal description of your building, the thing the sanctioning authority reads instead of visiting your plot, and the thing your contractor will build from later, so every line on it has consequences on site and in cost.

What the NKDA sanction set actually contains

People imagine a sanction submission as one big drawing. It is a stack, and each sheet answers one specific question that the reviewing officer has to be able to answer without ambiguity. Where does the building sit on the plot, how big is it on each floor, how tall is it, how does it drain, how do you get a car in and out, and does the arithmetic of built area against plot area hold up. The architect prepares these sheets so that a stranger with no context can pick up the file, follow the logic, and arrive at the same answer you did.

The overall shape of the set does not change much between authorities, which is useful to know if you own land in more than one jurisdiction. Whether you are going through the NKDA building plan sanction process for New Town, the KMC sanction process in Kolkata, or Bidhannagar for a Salt Lake plot, you are producing the same family of sheets, with the numeric rules and the checking style differing underneath. Our studio takes residential and commercial projects through all three of those processes regularly, so we tend to set up a drawing set knowing which authority will read it, and that shapes how the sheets are annotated from day one.

Sheet one, the site plan, which decides more than you think

The site plan shows your plot boundary, the building footprint sitting inside it, and the distance from each edge of the building to each boundary line. That distance is the setback, and it is the single most consequential number on the sheet, because it silently defines how wide your rooms can be before you have even drawn a room. On a narrow plot in Action Area II, a change of half a metre in a side setback can be the difference between a comfortable bedroom and one where the bed touches both walls.

The site plan also carries the plot dimensions as per your deed, the approach road and its width, the gate position, the septic or drainage arrangement, and the north point. That last one looks trivial and is not, because the north point drives daylight, ventilation and, for a lot of our clients, Vastu Shastra planning. We do a fair amount of vastu compliant design work, and the honest position is that it is far easier to reconcile vastu preferences with setback rules and room sizes at site plan stage than to retrofit them once the plan is frozen.

The catch here is that the site plan is only as good as the survey behind it. Plots in New Town and Rajarhat are usually regular and well documented, but we still measure on site rather than trusting the deed alone, because a plot that is 30 centimetres short on one edge in reality will produce a setback violation that nobody notices until the building is up and the completion drawings do not match. If you want the boundary detail worked out properly, the setback and open space rules for New Town are worth reading alongside your own site plan.

The floor plans, one sheet per level

Floor plans are the sheets most owners can actually read, and they are where the emotional conversation happens, because this is where your house becomes rooms. Each level gets its own plan, drawn to scale, with wall thicknesses, door and window positions, room names, internal dimensions, and the staircase.

What owners under-read on these sheets is the staircase and the circulation. A staircase eats floor area on every single level, so its width, its landing, and its position are structural decisions about how generous the rest of the house feels. The same goes for corridor widths and for where the shafts sit, because a badly placed shaft blocks a window that you were counting on for natural ventilation, and in a Kolkata summer you feel that decision every day for the next thirty years.

The ground floor plan carries extra weight, because it usually holds the parking, the entry, and the relationship to the road. Parking is a common source of rework, since it must be a real, usable space with a real turning path, not a rectangle drawn on paper that no car can actually reverse into, and the parking norms for New Town buildings are specific enough that guessing is a bad idea. Our residential architecture work tends to spend disproportionate time on the ground floor for exactly this reason.

Sections and elevations, or how tall this thing really is

The section is a vertical cut through the building, and it is the sheet that proves your heights work. Floor to floor height, clear ceiling height under beams, plinth level above road level, staircase headroom, parapet height, and the overall building height from ground to the top of the terrace all live here. Owners often discover on the section sheet that the 10 foot ceiling they were promised becomes 8 foot 9 inches under a beam, and that is a much better place to discover it than on site.

Building height is also the number the authority checks hardest, because it links to the permissible number of floors and to the road width in front of your plot. If you are trying to work out whether your plot can carry a G+3 or stops at G+2, the building height and floor limits for New Town will tell you more than any neighbour's guess about what their cousin built. Plinth height matters separately in this city, since monsoon water levels on your particular street should be driving that decision rather than a default number copied from another project.

Elevations are the outside faces of the building, one per side, and they show openings, projections, balconies, and the parapet line. They are the closest thing in the sanction set to a picture of your house, which is precisely why they mislead people. An elevation is a flat drawing with no depth and no material, so it will not tell you how the building will look at 4pm in October, and it will definitely not tell you how the finishes read. That is a separate conversation, and for clients who want to see the building properly before it is built we do 3D visualization and rendering alongside the sanction work, because a rendered view answers the question owners are actually asking when they stare at an elevation.

The area statement, which is really the whole application in one table

If you only learn to read one thing in the set, make it the area statement. This is the tabulated calculation that shows plot area, ground coverage, built up area on each floor, total built up area, and the resulting floor area ratio. It is where the drawing set stops being pictures and becomes arithmetic, and it is what the reviewing officer will verify line by line against the plans.

This table is where most rejections and queries originate in our experience, and almost never because someone cannot add. It happens because an area was classified optimistically, a projection was excluded that should have been counted, or a mezzanine or a covered terrace was treated as free area when the rules read otherwise. Getting comfortable with FAR and ground coverage rules in New Town helps you sanity check your own statement, and if you want the failure modes laid out directly, why building plans get rejected by NKDA covers the patterns we keep seeing.

The reason the area statement deserves your attention is commercial rather than technical. Every square foot in that table is money, so a set that under-uses your permissible area is quietly costing you a room, and a set that over-claims will come back with queries and cost you months. Both failures look identical to an owner who cannot read the table, which is why we walk clients through it slowly, and it is also why the area statement conversation usually happens before we draw anything pretty.

The supporting sheets, and why the boring ones matter

Beyond the main sheets, the set carries the pieces that make it a legal submission rather than a portfolio. The title block with the plot identifiers, the key plan locating your plot in the block, the drainage and sanitary layout, structural details where required, and the signature blocks. There is also the document set that travels with the drawings, and if you want to get ahead of that, the documents required for NKDA building sanction is a straightforward place to start collecting.

Drainage and water sheets look dull and then decide whether your ground floor floods. Kolkata rain is not gentle, so the drainage layout, the plinth level, the surface slope away from the building, and the rainwater harvesting provision where applicable all deserve a proper look rather than a nod. Basically, the sheets nobody photographs are the ones that keep the building comfortable.

One more thing worth saying plainly. The sanction set is not the construction set. Sanction drawings prove compliance, while construction drawings tell a contractor exactly how to build, with reinforcement details, wall layouts, electrical points, plumbing runs and finishing schedules. A set that only ever existed to clear the counter will leave your contractor improvising, and improvisation on site is expensive. This is where the boundary between the shell and the inside gets decided too, and if you are unsure how to sequence that, architect or interior designer, who to hire first is a useful read before you commit, because residential interior design done after the structure is frozen is always a compromise against one done alongside it.

How the set gets read on the other side of the counter

A reviewing officer is not looking for architecture. They are looking for internal consistency and for compliance, so their questions are things like whether the setback on the site plan matches the setback implied by the floor plan, whether the height on the section agrees with the number of floors shown, and whether the area statement adds up against the plans. A set that is beautiful and internally inconsistent will be sent back, and a set that is plain and airtight will move.

That is the practical argument for working with somebody who prepares these sets regularly for the same authority. Sumana Kumar, our principal architect, has taken residential and commercial projects through NKDA, KMC and Bidhannagar Municipal Corporation sanction processes for years, and the value of that repetition is not secret knowledge, it is simply knowing how each office reads a sheet, which annotations prevent a query, and where a clean set gets ambiguous. Our built work across New Town and Salt Lake, like the G+4 residence in Action Area II, came through that same process, and the drawing sets behind them look the way they do because of it.

At the end of the day, the drawing set is the only version of your house that exists before the house exists, so it deserves the same attention you would give the building itself. If you are at the stage of comparing architects and want to understand what the fee actually buys you across drawings, submission and site support, architect fees in Kolkata breaks that down honestly, and if you would rather just sit with somebody and go through your plot, your documents and what your set will need to say, get in touch with us and we will take it sheet by sheet.