Building Plan Deviations: Risks of Ignoring the Sanctioned Plan

Most homeowners who work with architects in Mysuru spend weeks getting the plan sanctioned, then treat that approved drawing as a formality once the foundation goes in. An extra room on the terrace, a balcony pushed a little further out, a staircase moved to free up the living room. Each change feels small on site. Together, they can turn a legal building into one that is difficult to sell, insure, finance or even connect to utilities.

The sanctioned plan is not just a permission slip. It is the version of your building the local authority has agreed to, checked against the rules for your plot. When what gets built differs, the gap is a deviation, and its risks often surface years later.

This article explains what counts as a deviation, what can go wrong, and how to keep your design, drawings and site work in step from the first sketch to handover.

What counts as a deviation

A deviation is any difference between the approved drawing and the structure on the ground that affects the parameters the authority checked. Not every change is equal. Moving an internal non-load-bearing partition is usually treated very differently from adding built-up area. The common categories are:

• Extra built-up area. An additional floor, a room on the terrace, or enclosing a sit-out or balcony so it becomes usable floor space.
• Setback encroachment. Pushing walls, projections, sunshades or staircases into the open space that must be left around the building.
• Height changes. Raising floor-to-floor heights or the overall building height beyond what was approved.
• Change of use. Sanctioning a house and then fitting out a shop, office or rental units on the ground floor.
• Structural changes. Removing columns or adding cantilevers without revising the structural design.

The exact tolerances, what is compoundable and what is not, and the penalties involved are set by the local authority and change over time. Confirm the current position with the authority or an advocate before assuming any change is acceptable.

The real risks of ignoring the sanctioned plan

Completion or occupancy certificate trouble

Where a completion or occupancy certificate is required, the authority compares the finished building with the approved plan. Significant deviations can delay or block that certificate, and without it some permanent utility connections and later transactions become harder.

Resale and home loans

Buyers and lenders usually check the sanctioned plan against the building. A valuer who finds an unapproved floor may exclude that area or the bank may decline the loan, which shrinks your pool of buyers and usually the price.

Regularisation costs and demolition notices

Some deviations can be regularised by paying a penalty, if a rule allows it at that time. Others may not be regularisable at all, and the authority can issue a notice to remove the unauthorised portion. Relying on a future amnesty is a gamble, not a plan.

Structural safety

This is the risk homeowners most often underestimate. The structural design and soil test are prepared for a specific building. An added floor or a removed column puts loads on footings, beams and columns never designed for them. Cracks and settlement can follow, and retrofitting costs far more than designing correctly at the start.

Why deviations happen, and how good design prevents them

Few owners set out to break rules. Deviations usually come from three gaps:

1. The approved plan did not match real needs. A rushed or generic sanction drawing leaves out a room or a proper staircase, and the owner changes it informally on site.
2. The site builds from a different drawing. When architect, engineer and contractor are separate, crews sometimes work from a sketch rather than the sanctioned set.
3. Budget pressure mid-way. Owners add rental space halfway through to justify the spend.

The fix is to do the hard thinking before submission. A plan that reflects how you will live, what you can afford and what the plot allows leaves little reason to improvise. This is where design-to-budget matters: size the drawing to your package and specification, not to a wish list.

At Uniq Builders, architectural design is handled in-house alongside structure, interiors and construction. Clients choose from 3D elevations and pick the one that gets built, and working drawings for all floors come with up to three rounds of revisions. Those revision rounds are the right place to settle the extra bedroom or the terrace room, before the plan goes for sanction, not after the slab is cast.

Keeping site work aligned with the approved drawing

Once the plan is sanctioned, a few habits keep the build honest:

• Keep one controlled drawing set on site. Working drawings, 2D and 3D elevations and the structural design should all trace back to the sanctioned plan.
• Put every change in writing. If a change is needed, ask your architect whether it affects area, setbacks, height, use or structure. If it does, it may need a revised sanction before work proceeds.
• Check at key stages. Setting out, plinth, each slab and the terrace are the points where deviations typically creep in. Measure against the drawing at each one.
• Keep your documents together. The sanctioned plan, khata, licences and utility papers are what a buyer or bank will ask for.

All Uniq Builders packages, from Premium at ₹1,999 per sq ft to Platinum at ₹2,999 per sq ft, include design and drawings, a structural design with soil test, and free assistance for government licensing work, with plan sanction, khata, licences and power, water and sewage connections handled by the company. Statutory fees are paid directly by the client. Starting rates apply, terms and conditions apply, and the final figure is confirmed after a free site visit. You can compare scope on the construction packages page and read more in our guide to working with architects in Mysuru.

If you already have a sanctioned plan and are unsure whether your intended changes are safe or permissible, bring it to a consultation. Contact the Mysuru team on +91 98449 93200 or at hello@uniqbuilders.com, Monday to Saturday, 10:00 AM to 7:00 PM.

Frequently asked questions

Are small internal changes also considered deviations?

Changes that do not affect built-up area, setbacks, height, use or structure are generally treated more leniently than those that do. Even so, moving walls can affect load paths or approved ventilation openings. Check each change with your architect and structural engineer before you build it.

Can a deviation be regularised after construction?

Some deviations may be regularised by paying a penalty if a rule or scheme permits it at that time, while others cannot be regularised at all. The rules and fees change, so confirm the current position with the local authority or an advocate. Designing the building you actually need before sanction is far cheaper than fixing it afterwards.

I want to add a floor later. What should I do now?

Tell your architect at the design stage so the structural design and foundations can be assessed for the future load. Ask how the additional floor would be approved when the time comes. Building it later without a revised sanction and structural check carries both legal and safety risk.