Custom Home Building Timeline in San Antonio: What to Expect Month by Month

"How long is this going to take?" It's one of the first questions every custom home buyer asks — and one of the most frequently low-balled by builders trying to win a contract.

The honest answer for a custom home in San Antonio is 12 to 18 months from contract signing to move-in. High-performance builds with specialty systems typically run 14 to 18 months. Simpler builds on straightforward lots can land closer to 11 to 13 months. Either way, the number is almost always longer than buyers expect going in.

This guide breaks down what actually happens in each phase, what drives the timeline, what causes delays, and what a well-run project looks like from your side of the equation.

Phase 1: Pre-Construction — Months 1 Through 3

Nothing goes vertical until a lot of work happens on paper. Pre-construction is where custom home projects live or die on timeline.

Design and Selections (Months 1–2)

If you're bringing your own architectural plans, this phase is shorter. If you're designing from scratch, budget 6 to 10 weeks for floor plan design, structural engineering, energy modeling, and initial selections meetings. The selections process — choosing finishes, fixtures, cabinets, tile, flooring — is where buyer-side delays are most common. Decisions that get deferred here push everything downstream.

A word on design: changes made on paper cost almost nothing. Changes made after the foundation is poured cost real money and real time. Invest in getting the design right before breaking ground.

Permitting (Months 2–3)

Permit timelines in San Antonio and the surrounding Hill Country counties are not fast. Current lead times in 78255 and Bexar County run 6 to 12 weeks from permit submission to approval, depending on jurisdiction complexity and current workload. Kendall and Comal counties run similar timelines.

A well-run project submits for permits while other pre-construction work is still underway — not after design is complete. Parallel-pathing permits against late design phases recovers 3 to 5 weeks off the total timeline.

Permits typically required: building, electrical, plumbing, mechanical, and OSSF/septic where applicable. HOA architectural review approval (where required) must often precede permit submission.

Site Preparation (Months 2–3, Often Concurrent with Permitting)

Clearing, grading, and utility work can begin before the building permit is issued in many jurisdictions. A good builder starts site prep as soon as the site plan is approved, not after all permits are in hand. On a Hill Country lot, this phase includes rock excavation, cut-and-fill grading, and utility rough-in. Timeline: 3 to 10 weeks depending on complexity.

Phase 2: Foundation — Month 3 to 4

Foundation work in San Antonio typically means a post-tension slab-on-grade engineered for local soil conditions. The process runs 3 to 5 weeks from excavation to pour to cure:

• Excavation and form-setting: 1 week
• Plumbing rough-in under slab: 1 week
• Rebar, cable layout, and inspection: 1 week
• Pour and cure: 1 to 2 weeks (concrete needs time — you can't rush it)

Foundation inspection is a required hold point. No framing begins until the foundation passes. In Bexar County, inspection scheduling can add 3 to 7 days. Good project managers schedule inspections before they're needed — not after.

Phase 3: Framing — Months 4 to 6

Framing is the phase that feels like the most visible progress. Walls go up, the floor plan becomes three-dimensional, and suddenly the home is real in a way renderings never quite captured.

A 2,800 to 3,500 sqft custom home frames in 4 to 8 weeks. Larger or more complex designs — multiple rooflines, cathedral ceilings, custom structural elements — run longer. Framing inspection follows, then the project moves into rough-in.

This phase is also when your low-voltage rough-in planning needs to be finalized. Speaker locations, network runs, shading motor wiring, security sensor positions — all of these get installed by the low-voltage sub during framing. Decisions deferred past this point become expensive retrofits.

Phase 4: Mechanical Rough-In — Months 5 to 8

This is the busiest phase for subcontractors — plumbing, electrical, HVAC, and low-voltage are all working the house simultaneously. Scheduling coordination here is a real project management skill.

• Plumbing rough-in: 2 to 3 weeks — supply, drain, and vent lines throughout
• Electrical rough-in: 2 to 3 weeks — panel location, all circuits, switches, outlet rough-in
• HVAC rough-in: 2 to 4 weeks — ductwork, air handler locations, zoned systems take longer
• Low-voltage rough-in: 1 to 2 weeks — CAT6A, speaker wire, conduit, security

All rough-in work must pass inspection before insulation and drywall begin. In a busy market, inspection scheduling is a timeline constraint that can't always be controlled — plan for it.

Phase 5: Insulation and Drywall — Months 7 to 9

On a high-performance build, spray foam insulation is applied to exterior walls, roof deck, and rim joists. This is a 2 to 3 day process per zone that requires the house to be closed tight before application. After insulation, drywall begins.

Drywall in a custom home of 3,000 sqft typically runs:

• Hang: 1 week
• Tape, float, and texture: 2 to 3 weeks
• Prime and inspect: 1 week

This phase feels slow from the outside — the house looks almost the same every day. But it's critical work. Drywall quality determines how well your finishes look. Rushing it shows up in every room for the life of the home.

Phase 6: Exterior — Months 7 to 10 (Concurrent with Interior)

Exterior work — stucco, stone, siding, windows, roofing, and garage doors — typically runs concurrently with interior rough-in and early finish work. Roofing and exterior envelope need to be complete before interior finishes can proceed in earnest. Window lead times in the current market run 6 to 16 weeks for custom sizes — they need to be ordered during design, not when framing is done.

Phase 7: Interior Finishes — Months 9 to 14

This is the longest and most labor-intensive phase, and the one where buyer-requested changes cause the most damage to the schedule.

• Flooring: 2 to 4 weeks — hardwood, tile, and carpet sequenced by area
• Cabinets: 1 to 2 weeks installation (after 8 to 14 weeks lead time — order early)
• Countertops: Template after cabinets are set; fabrication and install adds 2 to 3 weeks
• Tile work: 3 to 5 weeks for full custom baths and kitchen backsplash
• Paint: 2 to 3 weeks — typically two full passes
• Trim and millwork: 2 to 4 weeks — baseboards, door casings, built-ins
• Fixture installation: 1 to 2 weeks — plumbing trim, light fixtures, hardware

Sequencing matters here. Flooring before paint, or paint before flooring — there are arguments both ways and the answer depends on your finish selections. Your builder should have a clear sequence and communicate it before work begins.

Phase 8: Final Systems, Inspections, and Punchlist — Months 13 to 16

The final phase includes HVAC commissioning, low-voltage system programming, appliance installation, final inspections from the city or county, and the punchlist — the list of items that need correction before closing.

A well-run punchlist on a custom home runs 2 to 4 weeks. A poorly managed one drags for months. The difference is almost always how diligently the superintendent tracked quality throughout the build rather than catching everything at the end.

Certificate of Occupancy (CO) is the final required sign-off before you can legally occupy. Scheduling the CO inspection and resolving any remaining items typically takes 1 to 3 weeks from punchlist completion.

What Causes Delays?

In order of how frequently they actually affect San Antonio custom home timelines:

1. Buyer selection delays — Deferred finish decisions are the #1 controllable delay. When selections aren't made on schedule, the entire build sequence gets pushed.
2. Permit timelines — Jurisdiction-dependent and not fully controllable, but submitting complete, accurate drawings minimizes revision cycles.
3. Material lead times — Cabinets, windows, and specialty fixtures can run 8 to 20 weeks. Items that should be ordered at permit submission get ordered at framing and push the finish phase back.
4. Subcontractor scheduling — In a busy market, good subs have backlogs. A builder with established subcontractor relationships doesn't scramble for crews at each phase.
5. Weather — San Antonio summers are brutal but predictable. Spring storms and rare winter weather events (ice) can add 2 to 3 weeks across a full build.
6. Change orders — Mid-construction changes are expensive and almost always extend the timeline. A client-requested cabinet change mid-installation can push the countertop template 3 to 6 weeks.

How UrbanLUX Manages the Schedule

We use a detailed construction schedule from pre-construction through CO, updated weekly and shared with our clients. Every phase has defined start and end dates, inspection milestones, and material order deadlines.

Before we break ground, we have a selections meeting to lock in every long-lead item: cabinets, windows, appliances, tile, fixtures. Items that need 10+ weeks of lead time get ordered before the foundation is poured.

We also schedule inspections before they're needed, not the day before. In a market where inspection availability is constrained, the builders who stay on schedule are the ones who aren't waiting to get on the inspector's calendar.

Want to see how the timeline maps to your specific lot and scope? Schedule a consultation →

Frequently Asked Questions

How long does it take to build a custom home in San Antonio?

Most custom homes in San Antonio take 12 to 18 months from contract to move-in. Simpler builds on prepared lots can come in at 11 to 13 months. High-performance builds with specialty systems, complex architecture, or difficult terrain typically run 14 to 18 months. These timelines include pre-construction, permitting, and site prep — not just active construction.

How long does the permitting process take in San Antonio?

Permitting in San Antonio and Bexar County currently runs 6 to 12 weeks from submission to approval for a new custom home, depending on plan complexity and current jurisdiction workload. Submitting complete, accurate plans and parallel-pathing permit processing with late design phases minimizes the calendar impact.

What is the biggest cause of delays in custom home construction?

Buyer selection delays — deferred decisions on finishes, fixtures, and cabinets — are the most common controllable cause of schedule slippage. Material lead times (especially cabinets and windows, which can run 10 to 16 weeks) are the most common structural cause when items aren't ordered early enough.

Can I visit the site during construction?

Yes — and you should. Scheduled site visits at key milestones (framing completion, rough-in before drywall, pre-drywall walkthrough) are a normal part of the process. Unscheduled visits without coordinating with the superintendent are less advisable — active construction sites have real safety considerations and visits without notice can interrupt crew workflows.

What is a pre-drywall inspection?

A pre-drywall inspection is a walkthrough conducted after rough-in is complete but before insulation and drywall close up the walls. It's your last opportunity to verify electrical outlet placement, plumbing rough-in locations, low-voltage rough-in, and structural elements before they're inaccessible. A thorough pre-drywall inspection prevents expensive discovery of missed items during the finish phase or after move-in.

How do I track progress during the build?

A reputable custom builder provides regular schedule updates — at minimum weekly, often through a shared project management tool. You should have visibility into the current phase, upcoming milestones, and any schedule impacts as they happen. If your builder can't give you a current schedule at any point during the build, that's a problem worth addressing directly.