Legal Guide to Open-to-Sky Enclosures in Bangalore Apartments

What Legal Checks Are Needed When an Open-to-Sky Area in an Apartment Building Was Enclosed Without BBMP Permission in Bangalore?

By the Property Law Team | Legal Brigade | Bar Council of Karnataka

When a Bangalore apartment building’s designated open-to-sky area – a light well that provides natural light and ventilation to interior rooms, a central courtyard that serves as a shared open space, a ventilation shaft required by building regulations for internal bathrooms and kitchens or a service area that was shown as open in the BBMP-sanctioned building plan – was subsequently enclosed with a roof structure, glass panels, metal sheets or walls without obtaining a revised building plan sanction from BBMP, the enclosure is an unauthorised FAR addition that violates the original building plan conditions and that BBMP can direct to be demolished and restored to its original open state.

What Is an Open-to-Sky Area and Why Does BBMP Require It in Building Plans?

BBMP’s building regulations require that residential buildings maintain certain minimum open spaces – both at the ground level as setbacks around the building and within the building structure as open-to-sky areas. Open-to-sky areas within the building include light wells – vertical shafts that extend from the roof to the lower floors, providing natural light and ventilation to rooms that do not face the exterior; central courtyards in traditional building forms that provide shared open space and ventilation; and service areas at the rear of buildings that allow maintenance access and provide ventilation for kitchens and bathrooms.

These open areas are required by the building regulations for two reasons: ventilation and light requirements for habitable rooms and the FAR calculation framework. Open-to-sky areas are typically excluded from the FAR calculation – their area does not count toward the building’s total built-up area. When they are enclosed, the enclosed area effectively becomes built-up floor space – consuming FAR that was never sanctioned for that location. The enclosure therefore creates both a regulatory non-compliance and an unlicensed FAR addition.

Table 1: Open-to-Sky Area Enclosure Scenarios and Their Consequences

How Does Open-to-Sky Area Enclosure Affect FAR Calculations?

The BBMP’s FAR calculation for a residential building specifies the maximum ratio of total built-up floor area to the plot area. Open-to-sky areas – light wells, courtyards, ventilation shafts – are excluded from this calculation precisely because they are open and not enclosed floor space. When an open-to-sky area is enclosed, the enclosed area becomes effective built-up floor space that was never included in the sanctioned FAR calculation. If the building was already at its maximum permitted FAR with the sanctioned floors, the enclosed open area creates an over-FAR situation with no headroom for regularisation.

A building with a 2.5 FAR allowance that consumed 2.5 FAR in its sanctioned floors has no remaining FAR for the enclosed open-to-sky area. BBMP in this case cannot regularise the enclosure through compounding – because there is no FAR headroom. Demolition and restoration of the open area is the only compliance option. Where some FAR headroom exists, regularisation may be possible through a plan amendment and compounding fee payment – but the amount depends on the area enclosed and the applicable compounding rate.

How Do I Check Whether an Open-to-Sky Area Has Been Unauthorisedly Enclosed?

Step 1: Obtain the BBMP-sanctioned building plan and specifically look for any areas marked as “open-to-sky,” “light well,” “ventilation shaft,” “courtyard” or “service area.” Note their locations, dimensions and the floor levels they span.

Step 2: Physically visit the building and confirm whether the open-to-sky areas shown in the plan are actually open – or whether they have been enclosed with roofing, glass panels or walls. Any enclosed area that the plan shows as open is an unauthorised enclosure.

Step 3: Ask the developer or association whether any plan amendment was obtained from BBMP for the enclosed areas. A legitimate enclosure would have been sanctioned through a revised building plan with BBMP’s approval.

Step 4: Assess whether the enclosure creates a ventilation or light deficit for any habitable rooms that were designed to receive light or ventilation through the now-enclosed area. An enclosed light well may leave interior rooms without natural light or ventilation in violation of building regulations.

Step 5: Have a property lawyer confirm the open-to-sky area’s sanctioned status from the building plan and assess the FAR headroom for regularisation if enclosure has occurred.

Table 2: Open-to-Sky Area Compliance Assessment During Site Visit

Frequently Asked Questions

Q1. What is an open-to-sky area in an apartment building and why is it required?

An open-to-sky area is a designated space within or around a building that is required by BBMP’s building regulations to remain unroofed and exposed to the sky. Light wells provide natural light and ventilation to interior rooms that do not face the exterior. Central courtyards provide shared open space and ventilation. Ventilation shafts service internal bathrooms and kitchens. These areas are required for habitable room ventilation standards and are excluded from the FAR calculation because they are open rather than enclosed floor space.

Q2. How does enclosing an open-to-sky area create an unauthorised FAR addition?

Open-to-sky areas are excluded from the FAR calculation because they are open, not enclosed. When they are enclosed with a roof or walls, the enclosed area effectively becomes built-up floor space that consumes FAR. If the building was already at its maximum permitted FAR, the enclosure creates an over-FAR situation. BBMP can require the demolition of the enclosure and the restoration of the open area, because no plan amendment was obtained to sanction the FAR addition.

Q3. Can an enclosed open-to-sky area be regularised by BBMP?

Regularisation is possible only if the building has sufficient FAR headroom to accommodate the enclosed area under the applicable bye-laws. If the building was already at its maximum FAR, regularisation is not possible – BBMP cannot sanction a FAR addition that exceeds the maximum. Where FAR headroom exists, the developer or association can apply for a revised building plan amendment and pay the applicable compounding fee. The regularisation process requires BBMP’s assessment of the enclosed area’s dimensions and FAR impact.

Q4. Does the OC cover an enclosed open-to-sky area?

The OC is issued for the building as constructed in accordance with the sanctioned building plan. If the open-to-sky area was enclosed before the OC was issued, the OC may have been issued for the building including the enclosure – but only if the enclosure was in the sanctioned plan (which it should not have been for an open-to-sky area). If the enclosure occurred after the OC was issued, the OC does not cover the enclosure – the enclosure is a post-OC unauthorised addition.

Q5. What ventilation requirements apply to rooms that depended on the now-enclosed light well?

Habitable rooms must receive natural light and ventilation through either an external window or an internal light well or ventilation shaft. When the light well is enclosed, the rooms that depended on it for ventilation are left without adequate natural ventilation in violation of BBMP’s habitability requirements. These rooms may need alternative ventilation provision – through mechanical ventilation or a new external opening – to comply with the requirements. The ventilation deficit compounds the building plan non-compliance created by the enclosure.

Q6. Who is responsible for an open-to-sky enclosure – the developer or the association?

Responsibility depends on when and who enclosed the area. If the developer enclosed the light well or courtyard during construction to create more usable space, the developer is responsible for the deviation. If the association or individual flat owners enclosed the area after possession, the association or the specific owner is responsible. In either case, BBMP’s enforcement action is directed at the current owner and manager of the building – the association – regardless of who created the original enclosure.

Q7. What if the enclosure has been in place for twenty years with no BBMP action?

BBMP’s failure to take action for twenty years does not regularise the enclosure or extinguish BBMP’s enforcement power. BBMP’s enforcement powers under the BBMP Act do not have a limitation period that runs against BBMP – the authority can issue a demolition notice for an unauthorised structure at any time. However, a twenty-year-old enclosure that has been undisturbed may have a lower practical enforcement risk than a recently identified one – unless a specific complaint triggers BBMP’s attention.

Q8. Can the association install a retractable roof over an open-to-sky area?

A retractable roof – one that can be opened and closed – occupies a grey area in BBMP’s building regulations. A permanently installed retractable roof structure requires a building plan amendment because the structure itself, even when open, is a physical addition to the building. BBMP’s approach to retractable structures varies by ward and by the specific structure type. A permanently installed retractable roof without a plan amendment is a building compliance risk, even if the roof is technically openable.

Q9. Does an enclosed light well appear in the BBMP OC?

If the light well was enclosed during construction and the OC was issued for the building in its constructed state – including the enclosure – the OC may not visibly distinguish between the plan’s open light well and the constructed enclosure. The OC reflects what BBMP inspected, which may or may not include the enclosure depending on how thorough the inspection was. A buyer who relies only on the OC will not know whether the OC covers the building as originally planned or as modified by the enclosure. The building plan comparison during the site visit is the essential check.

Q10. How does Legal Brigade check for open-to-sky area enclosures during property verification?

Legal Brigade’s site visit protocol includes a specific comparison of the BBMP-sanctioned building plan’s open areas against the physical building’s actual configuration. Any area shown as open-to-sky in the plan that appears enclosed during the visit is flagged as a potential unauthorised enclosure. Legal Brigade then confirms whether a plan amendment covers the enclosure, assesses the FAR headroom for regularisation and advises the buyer on the enforcement risk and the regularisation prospects before any purchase commitment.

Buying a flat in a Bangalore building where the lobby or courtyard appears to have a roof not shown in the original plan? The building plan open-to-sky area comparison and the FAR headroom assessment confirm the enclosure risk

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Frequently Asked Questions