Hebbal-Sarjapur Metro Phase 3A 2026: Rs 28,405 Cr Line Decoded

Phase 3A is the most consequential long-horizon Bengaluru metro corridor, and the most-discussed metro topic on r/bangalore in early 2026. The 36.59 km Hebbal to Sarjapur line connecting Koramangala, Dairy Circle, Agara, Bellandur, Carmelaram and Sarjapur cleared Karnataka cabinet on December 6, 2024, with the DPR revised in October 2025 to bring total cost down to Rs 28,405 crore (approximately Rs 2,900 crore reduction from the earlier estimate). Land acquisition is estimated at approximately Rs 5,000 crore. The corridor is now awaiting Union Cabinet approval, expected by end-2026. Estimated commissioning spans 2030 to 2033 across phased operational milestones. Critically, this is a cross-city corridor connecting North Bengaluru's airport axis to East Bengaluru's tech corridor via central employment nodes — the first such cross-city link in the Namma Metro plan.

What is Phase 3A and why is it different from Phase 3?

Phase 3 (Outer Ring Road West) is a separate 44.65 km corridor approved in 2023, in active construction, targeted operational 2027 to 2029. Phase 3A is the cross-city Hebbal-Sarjapur corridor, approved by Karnataka cabinet in December 2024, awaiting Union Cabinet approval, targeted operational 2030 to 2033. The two corridors serve fundamentally different geographies and address different commute patterns.

Phase 3A's structural significance is that it directly connects North Bengaluru (Hebbal, the airport corridor) to East Bengaluru (Sarjapur, the tech corridor) via central employment nodes (Koramangala, Bellandur). Currently, this commute requires either ORR via road (60 to 90 minutes peak) or an indirect metro routing through the central city. Phase 3A compresses it to 45 to 60 minutes via direct metro — the largest single commute compression in the Namma Metro plan.

The 28 stations and what each one means for buyers

The 36.59 km alignment includes 28 stations across the Hebbal to Sarjapur sweep. Buyer-relevant nodes:

Hebbal: integration with Phase 1 Green Line and the airport corridor. Multi-modal interchange.

Koramangala: dense central employment and residential cluster, currently underserved by metro despite high density.

Dairy Circle: connection point for South Bengaluru axis.

Agara: emerging mid-segment residential cluster.

Bellandur: ORR tech corridor interchange, addressing the worst peak-hour bottleneck in the city.

Carmelaram: Sarjapur Road catchment, currently rail-only via the existing suburban network.

Sarjapur Road end: the corridor terminus connecting the Sarjapur township cluster to the wider city.

Why the October 2025 DPR revision matters

The Detailed Project Report revision in October 2025 brought project cost from approximately Rs 31,000 crore to Rs 28,405 crore — a Rs 2,900 crore reduction. Three structural changes drove this:

First, alignment optimisation reduced underground tunnelling distance, which is the most cost-intensive component of metro construction.

Second, station consolidation in some stretches reduced the total station count modestly while preserving catchment coverage.

Third, land acquisition footprint was reduced via the alignment optimisation, addressing one of the friction points that had slowed earlier sanction.

The leaner DPR materially improves the probability of Union Cabinet approval. India's broader metro funding context has shifted toward cost-conscious projects, and a Rs 28,405 crore corridor is structurally easier to sanction than a Rs 31,000 crore equivalent.

The buyer-decision implication for Sarjapur Road

Sarjapur Road's current Rs 12,150 per sqft average (per 99acres April 2026 data, up 84.1% over three years) is already pricing in Phase 3A speculation. Pre-launch projects on the corridor carry an 8 to 15% pricing premium attributable to metro speculation; this is the standard pre-sanction pricing pattern.

The Whitefield Phase 1 metro analogue is instructive. Whitefield's metro extension was sanctioned in 2017, operational by 2023, and the corridor saw two distinct pricing legs: 15 to 25% in the 24 months following central sanction, and another 25 to 35% in the 24 to 36 months following operational commissioning. Sarjapur Road buyers entering before central sanction capture both legs; buyers entering after capture only the second.

Prestige Garden Breez at Phase 7 of The Prestige City sits at the township-format anchor for Sarjapur with Phase 3A catchment exposure for the eventual operational metro. The structural advantage is the integrated-township pricing premium combined with Phase 3A speculation upside.

Bellandur and Carmelaram: the ORR-axis premium

Bellandur's Phase 3A station is structurally significant because it provides direct metro alternative to the ORR road commute that has been Bengaluru's worst peak-hour pain point for over a decade. Current Bellandur and Carmelaram pricing runs Rs 11,500 to Rs 14,000 per sqft, with the corridor priced primarily on tech-cluster proximity (Microsoft, Cisco, Intel, multiple captive centres).

Phase 3A's metro adds a structural commute layer to the corridor. Bellandur properties within 500m to 1 km of the planned station are likely to capture 12 to 20% additional appreciation in the 24 months following operational commissioning, on top of the broader corridor maturity.

Hebbal and the North-South integration thesis

Hebbal is the Phase 3A north terminus, integrated with Phase 1 Green Line and the airport corridor (Yelahanka, Devanahalli). The structural significance is that Hebbal becomes a multi-modal interchange node — Phase 1 metro, Phase 3A metro, BSRP eventually, and the airport-corridor road network.

Multi-modal interchanges historically command premium pricing relative to single-corridor stations. Hebbal currently runs Rs 9,500 to Rs 12,500 per sqft (with significant variance by sub-locality). Post Phase 3A operational milestone, this pricing is likely to consolidate at the upper end of the band as multi-modal benefits internalise.

Prestige Devanahalli at the airport corridor extension provides direct exposure to the Hebbal-North axis Phase 3A catchment, with the structural advantage of plot-and-apartment format optionality.

Koramangala and central Bengaluru's metro gap

Koramangala has been the single most-served-by-employment but most-underserved-by-metro corridor in Bengaluru. The cluster anchors the city's startup ecosystem (Bangalore's Silicon Valley analogue) and a dense premium residential market (Koramangala 5th Block, 6th Block, BTM Layout adjacent). Yet Phase 1 metro served Koramangala only via Indiranagar and the central city stations, which require feeder bus or auto connectivity.

Phase 3A's Koramangala station resolves this structural gap. The pricing impact is likely to be the most concentrated of any Phase 3A station, given the existing employment density and constrained current metro access. Premium Koramangala properties (Rs 18,000 to Rs 22,000 per sqft current) may see 8 to 15% additional appreciation post-operational, while emerging adjacent areas (BTM Layout, Bommanahalli) capture 15 to 25%.

The Union Cabinet approval timeline

Industry expectation places Union Cabinet approval at end-2026 to early 2027, based on the typical timeline between state cabinet approval and central concurrence on prior Bengaluru metro phases. Phase 3 (ORR West) took approximately 14 months from state cabinet to central approval; Phase 3A is tracking a similar trajectory.

The revised DPR's lower cost structure improves the probability of approval in this window. Two friction points to watch: the broader central infrastructure budget cycle for FY26-27, and any inter-departmental review of the alignment vis-a-vis the proposed BBMP tunnel road project at Hebbal junction.

The BBMP tunnel road question

The proposed BBMP tunnel road at Hebbal junction was cited in 2025 as a potential alignment conflict with Phase 3A. The October 2025 DPR revision is understood to have addressed this through alignment optimisation — Phase 3A's Hebbal stretch was tweaked to coexist with the proposed tunnel road plan. Final resolution will be confirmed when Union Cabinet approval is announced.

For buyers in Hebbal and the immediate airport corridor, this is worth tracking because alignment conflicts are the single most common cause of metro-corridor delays in Indian cities. The October 2025 DPR revision's specific attention to this conflict suggests the issue is being managed proactively.

The 5-year buyer playbook

Three operational principles for Phase 3A-correlated decisions over the next 12 to 18 months.

First, treat the December 2024 Karnataka cabinet approval as the working baseline. The corridor will happen; the only remaining variable is timing.

Second, prioritise corridors where Phase 3A complements rather than substitutes for existing metro access. Bellandur, Carmelaram, and the Sarjapur stretch are the strongest matches because Phase 3A is the corridor's first metro connection. Koramangala captures the structural gap-filling benefit.

Third, do not pay full Phase 3A premium pricing without a 5+ year horizon. The corridor's operational milestones span 2030 to 2033, which means buyers entering today will hold for 5 to 8 years before realising the full metro-led pricing benefit. Buyers with shorter horizons should weight Phase 3A speculation lower in their underwriting.

Cross-corridor perspective

Buyers running multi-corridor Bengaluru portfolios should layer Phase 3A's long-dated thesis against Yellow Line operational benefit (immediate, already in pricing), BSRP operational milestone (December 2026 to Q1 2027), and Phase 3 ORR West operational milestone (2027 to 2029). Each corridor has a distinct timing profile and risk-adjusted return signature.

Prestige Hennur Kothanur represents the East Bengaluru BSRP-direct exposure with cleaner near-term timing than Phase 3A. Prestige Hoskote represents the broader STRR connectivity thesis where Phase 3A speculation is structurally less direct.

The honest read

Phase 3A is real, structurally important, but long-dated. The corridor will happen, the cost is now optimised at Rs 28,405 crore, and Karnataka cabinet has approved. Union Cabinet sanction is the gating step, expected end-2026 to early 2027. Buyers entering Sarjapur Road, Bellandur, Carmelaram, Hebbal, or Koramangala in 2026 capture the pre-sanction pricing leg. The structural appreciation cycle then runs through 2030 to 2033 operational milestones. This is a 5 to 8 year hold thesis, not a 12 to 24 month flip.

Related reading on PropNewz

Sarjapur Road's Five-Year Supply Low covers the active corridor where Phase 3A speculation has compounded the pricing structure. Yellow Line and Hosur Road's Rental Reset covers the operational metro analogue. BSRP Corridor 2 and 4 covers the cleaner near-term operational timing for East Bengaluru.

Looking to buy, invest, or get advisory support in Bengaluru?

The PropNewz team helps homebuyers, investors, and NRIs navigate Bengaluru property decisions across Sarjapur, Whitefield, KR Puram, the airport corridor, the Bellandur-Carmelaram axis, and Koramangala. We offer independent advisory on K-RERA verification, multi-corridor metro entry timing, builder shortlisting, financing, and end-to-end transaction support.

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By PropNewz Team