Loop 1604 Phase 4 Is 35% Done — What North San Antonio Buyers Need to Know Right Now

If you have been watching the construction along Loop 1604 on San Antonio's north side, here is the update you have been waiting for. At a recent city and TxDOT town hall, officials confirmed that Phase 4 of the Loop 1604 expansion — running from US 281 west to Redland Road — is approximately 35% complete. The project carries a price tag of roughly $218 million, and completion is expected sometime in 2027. Separately, a diverging diamond interchange has recently opened at Loop 1604 and Blanco Road, giving drivers in that corridor an immediate change in how they navigate one of the busiest intersections in the area.

For anyone thinking about buying, selling, or renting a home in this part of San Antonio, both developments are worth paying close attention to.

The Phase 4 corridor runs through one of the most active growth zones in the entire metro. Communities like Stone Oak, Sonterra, and the neighborhoods clustered around the 78258 and 78261 ZIP codes sit within easy reach of this stretch of 1604. Buyers who have been drawn to the area by good schools — particularly those zoned to North East Independent School District and Comal ISD — already know that traffic has been a real friction point in daily life. A wider, more capable Loop 1604 is a direct response to that friction.

Major road projects like this one tend to influence home values in two distinct phases. During construction, some buyers pull back. They hear "2027" and picture years of orange barrels, lane closures, and unpredictable commute times. That hesitation is understandable, and it can actually create a window of opportunity. Sellers in neighborhoods immediately adjacent to the construction zone may price more competitively than they would in calmer conditions. Buyers willing to tolerate a temporary inconvenience for the sake of long-term access and appreciation potential sometimes find real value in exactly these situations.

Once construction wraps up, the second phase typically arrives: increased buyer demand, upward pressure on prices, and stronger interest from employers and developers looking at commercial land nearby. The stretch between US 281 and Redland Road runs through an area already attracting significant residential development. When the road catches up to the growth, the area becomes easier to justify to buyers who previously hesitated.

The diverging diamond at Blanco Road is a more immediate story. This type of interchange — where traffic briefly crosses to the opposite side of the road — is designed to eliminate the left-turn conflict that slows traditional intersections. Drivers heading to destinations along Blanco Road north of 1604, including parts of the 78258 ZIP code, will notice the difference in how traffic flows compared to even a few weeks ago. It takes a drive or two to get accustomed to the layout, but diverging diamonds consistently move more vehicles through an intersection in less time than a conventional design.

For buyers considering homes near Blanco Road and 1604 — whether in established neighborhoods or newer builds pushing further north toward Bulverde and Garden Ridge in Comal County — that interchange opening is a practical quality-of-life improvement available right now, not a year from now.

If you are selling a home in this corridor, the conversation with buyers is actually easier than it might feel in the middle of construction season. You can point to specific progress — 35% complete, funded, on track for 2027 — rather than asking buyers to take something on faith. There is a known timeline. There is a completed piece of infrastructure already open and functioning at Blanco Road. Those are tangible talking points that can help a buyer who is on the fence feel more confident.

For renters in communities along north 1604, including apartment complexes in the Stone Oak area and newer build-to-rent neighborhoods coming online in the 78261 and 78163 ZIP codes, the road improvements signal continued investment in an area that landlords and property managers are watching closely. Rental demand in well-connected north San Antonio suburbs remains strong, and better infrastructure typically supports that demand over time.

Homeowners who have no plans to move anytime soon can simply mark 2027 on the calendar and look forward to a quieter, more efficient version of a road they use every day. The short-term inconvenience of an active construction zone along a major loop highway is a trade most people accept when the end result is meaningful.

The bottom line for buyers specifically: do not let the construction timeline scare you away from neighborhoods you otherwise love in this part of the city. The work is funded, it is progressing, and the investment is significant. Buying during the construction phase and settling in before completion has historically been one of the smarter moves in high-growth suburban corridors like this one.