Home Additions & ADUs in Sherman, TX

More room in a fast-growing city

Sherman is growing fast — Texas Instruments' semiconductor mega-site on the north side is bringing thousands of jobs to Grayson County, and new subdivisions keep going up on the south and west sides. That kind of growth changes what families need from a house: more bedrooms, a home office, space for aging parents, or a separate accessory dwelling unit (ADU) for rental income or a returning adult child.

Adding on lets you stay in the neighborhood you already like instead of competing for a new-construction lot.

Additions that fit Sherman homes

Many of the city's older homes near downtown — post-war bungalows, mid-century ranches, and the historic houses around Heritage Row and Austin College — sit on generous in-town lots with room to grow. Common projects:

• Primary-suite additions that give a 1950s ranch a proper owner's bath and closet.
• Second-story or bump-out additions where the lot is tight but the family isn't shrinking.
• Detached ADUs and garage conversions — increasingly popular as TI-driven demand pushes rents up and multigenerational living becomes common.

On a historic-district property, we match rooflines, siding, and proportions so the addition reads as original, not bolted-on.

The Sherman permit reality

An addition or ADU adds square footage, which means structural, electrical, and plumbing review — the full plan-review process at Sherman's Development Services / Building Division (317 S. Travis St). Here's the part that catches people: review doesn't start until all fees are paid, then takes about 15 working days depending on workload, and if the city requests changes, the resubmittal restarts that 15-business-day clock. We prepare complete construction documents up front precisely to avoid that restart.

Everything is filed through the city's Self Service Portal (Tyler EnerGov, live since March 2025), and the permit must be pulled by the owner or a contractor registered with the City of Sherman. We're Allen-based — Sherman is near the top of the footprint we cover up US-75, not a local branch — but we're registered to pull and manage the permit for you.

Built right, built to code

New square footage has to tie into your existing structure, electrical panel, and plumbing correctly, so we bring in state-licensed electricians and plumbers and coordinate every inspection. We're insured and bonded, and we handle the paperwork, the trades, and the schedule end to end. Questions about your specific lot or ADU rules? The city's building office answers at 903-892-7229, and we'll help you read the site before you commit to a plan.