A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Richardson
Most Richardson homeowners adding a bedroom or bathroom spend between $185 and $310 per square foot, which puts a typical 320-square-foot bedroom-and-bath addition in the $59,000 to $99,000 range before finishes. The permit process here is different from surrounding cities: Richardson is a home-rule city that issues its own building permits through the Building Inspection Division, so structural work, electrical changes, plumbing rough-ins, and mechanical alterations each trigger separate inspections that a homeowner has to schedule in sequence. If you’re planning an addition in Richardson, the two things that most affect your final cost are foundation work on clay-heavy soil and the permit inspection timeline. Call (361) 204-4652 for a free, written estimate on your specific scope.
Why Lodgewick ADU Dallas Is Richardson’s Preferred Home Addition Contractor Team
Our Home Addition Contractor crews work in Richardson neighborhoods every week, from Canyon Creek to Arapaho Heights. We know the difference between a 1960s pier-and-beam house near Heights Park and a 1980s slab home off Campbell Road, and we scope each addition accordingly. Led by Russ Delmar, our team has built bedroom additions, bathroom additions, and full guest suites across Richardson, and homeowners consistently tell us the same thing: the written price we gave them before demo is what they paid after final inspection. That’s not an accident. It’s how we run every project.
Every job comes with the 365-Day Done Right Promise. If the work isn’t right within a year, we come back and make it right, free. That promise arrives in writing before any work begins, and it’s backed by a live person who answers our phone 24/7. When a Richardson homeowner calls with a question about a permit inspection or a trim detail, they talk to a person, not a voicemail tree. Our techs are background-checked and uniformed, so you always know who’s walking onto your property. We also work directly with established prefab and materials manufacturers including James Hardie, Tuff Shed, and Plant Prefab, which helps us match existing exteriors and hit tighter timelines on some scopes.
Bathroom Addition Contractor in Richardson
Bathroom Addition Contractor work in Richardson typically runs $220 to $300 per square foot for a full build-out, meaning a standard 60 to 100-square-foot bathroom addition lands between $13,000 and $30,000 depending on plumbing proximity and fixture level. The biggest Richardson-specific cost driver is sewer line location. Many of the city’s alley-loaded lots run sewer laterals through easements that force careful routing, and older pier-and-beam homes often need floor joist reinforcement to carry wet-area tile systems. We pull the city of Richardson plumbing permit, schedule the rough-in inspection, and coordinate with the separate mechanical inspection for exhaust venting, all before drywall goes up.
When a full bathroom makes sense
A full bathroom addition with a tub or shower, toilet, and vanity works best when a Richardson family has a growing household and no room to expand a half bath. These projects often piggyback on a bedroom addition, which lets us share one plumbing rough-in inspection and one foundation permit rather than paying twice.
Bathroom costs and what changes them
Moving a toilet location more than a few feet from the existing stack, adding a curbless shower, or discovering cast-iron drains that need replacement can push the final number higher by $3,000 to $8,000. We put the price in writing before work starts, and we tell you exactly which conditions would change it, so nothing gets discovered at the door.
Bedroom Addition Contractor in Richardson
Bedroom Addition Contractor pricing in Richardson runs $185 to $260 per square foot for a standard 12×14 or 14×16 room with one window, closet, and tie-in to existing HVAC, which puts most projects between $31,000 and $58,000. Foundation choice drives the number more than anything else. Richardson’s clay-heavy soils expand and contract with moisture, so a slab addition typically needs a soil test and possibly engineered piers, which can add $4,000 to $11,000 to the foundation line before framing starts. We pull the city of Richardson building permit for the structural scope and schedule the separate electrical inspection once the new branch circuit is installed.
Bedrooms on slab versus pier-and-beam
Homes east of US-75 in neighborhoods like Reservation and Duck Creek are more likely to sit on pier-and-beam, which makes under-floor mechanical runs easier but sometimes requires shimming and leveling. Slab homes west of Central, common in Canyon Creek and Prairie Creek, may need concrete saw cutting for drain lines, which costs more up front but produces a cleaner finished floor elevation.
Second bedroom or primary suite addition
A primary suite with a walk-in closet and attached bath runs higher per square foot because the bathroom plumbing drives cost density. We often recommend phasing the bedroom shell and the bath finish work so the permit triggers line up without losing inspection days.
Trusted Brands We Work With in Richardson
For Richardson additions, we regularly spec James Hardie fiber-cement siding because it holds up through North Texas freeze-thaw cycles and keeps the addition looking like the original house rather than a bolt-on. For prefab and panelized scopes, Plant Prefab and Tuff Shed components let us pre-build wall sections off site, which shortens framing time and reduces weather exposure during Richardson’s spring storm season. Because we maintain local material relationships and know Dallas-Fort Worth supplier lead times well, we can usually give Richardson customers a firmer delivery date at the estimate stage than a contractor who orders everything after permit approval.
Common Home Addition Contractor Problems We See in Richardson Homes
- Skipping the foundation inspection after excavation. Richardson’s Building Inspection Division requires a pre-pour inspection before concrete goes in. Contractors who miss this callback trigger a correction notice, and the stop-work delay can stretch two to four weeks while the city re-reviews the piers or grade beams.
- Underestimating clay soil movement. Richardson’s expansive clay shrinks in summer and swells after rain. An addition poured without a soil test or adequate pier depth can develop slab cracks within two years, and the fix is a tear-out, not a patch. We see this most often when an out-of-area contractor treats Richardson like a generic North Texas job.
- Clashing with alley-loaded sewer easements. Several Richardson neighborhoods built in the 1970s and 1980s run sewer laterals through rear easements. If a contractor doesn’t check the city’s easement map before setting a bathroom addition floor plan, the plumbing rough-in can end up where the city won’t allow it, forcing demolition of fresh work.
- Mismatched additions on 1980s exteriors. Richardson has thousands of homes with original masonry and fiber-cement mixes from the 1980s. An addition that doesn’t match the existing siding profile or brick tone reads as a patch job and hurts resale. We match existing materials and often order James Hardie profiles specific to the neighborhood’s original build era.
Pricing for Home Addition Contractor in Richardson, TX
Here are real ranges we quote in Richardson, based on recent completed projects:
- Bedroom addition (12×14, basic finish): $31,000 – $58,000
- Bathroom addition (60 – 100 sq ft, full build): $13,000 – $30,000
- Combined bedroom-and-bath addition (320 sq ft): $59,000 – $99,000
- Foundation upgrades (soil test, piers, grade beam): $4,000 – $11,000
- Permit and inspection fees (city of Richardson): typically $1,200 – $2,800 depending on scope
What changes the price once work starts: hidden foundation conditions, sewer line relocations, fixture upgrades, and any scope additions you request mid-project. We write every price before the first nail and the only number that moves is one you approve in writing first. Call (361) 204-4652 to get a free estimate with a line-item scope for your Richardson property.
We Also Serve Cities Near Richardson
Our crews work throughout the northeast DFW corridor. In addition to Richardson, we regularly build home additions in Addison, Plano, Garland, and Rowlett. If you’re in one of those cities, the same written pricing and 365-Day Done Right Promise applies. Tell us your address and we’ll confirm which permit jurisdiction applies, since inspection workflows differ from Richardson’s home-rule process.
Serving Richardson, TX - Our Local Coverage Area
We’re based in the Richardson area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Home Addition Contractor in Richardson
For a combined bedroom and bathroom addition, Richardson typically requires four to six separate inspections: a pre-pour foundation inspection, a framing inspection, a plumbing rough-in inspection, an electrical rough-in inspection, a mechanical inspection if you’re extending HVAC, and a final building inspection. The exact count depends on scope; a bedroom-only addition with no bathroom may need only three or four. We schedule every inspection for you and stay on site for the walk-through. Call (361) 204-4652 for a copy of a typical Richardson inspection sequence on a project like yours.
Richardson’s zoning code sets front, side, and rear setbacks based on your specific zoning district, but on a standard 60-foot-wide residential lot, you’ll generally need a minimum 5-foot side yard setback and a 15-foot front yard setback, with rear setbacks varying by district. Corner lots restrict even further on the side facing the street. We verify your specific setback envelope with the city before we ever draw a floor plan, so the addition fits legal limits rather than forcing a redesign after permit submittal. Call (361) 204-4652 and we’ll pull your lot’s setback card as part of the free estimate.
Yes, for most slab-on-grade additions, Richardson requires a geotechnical soil report as part of the permit application. The city wants to see that the foundation design accounts for the expansive clay’s movement potential. Our crew recently completed a 320-square-foot bedroom and bathroom addition in Canyon Creek where the soil report came back recommending deeper piers under the new footprint, which added about three weeks to the schedule but produced a foundation that won’t crack in the next drought cycle. Call (361) 204-4652 for an exact quote on your lot, since two properties a block apart can produce very different soil reports.
Plan on 10 to 16 weeks from permit submittal to final inspection for a standard combined bedroom and bathroom addition in Richardson. Permit review alone runs two to four weeks, foundation work one to two weeks, framing two to three weeks, mechanical and plumbing rough-ins one to two weeks, then finishes and final inspection fill out the rest. Weather and soil report turnaround time can add days. We put the schedule in writing at contract and update you at every milestone. Call (361) 204-4652 to get a dated schedule for your specific project.
No. Even prefabricated units like Abodu or Cover must go through Richardson’s building permit process when they attach to your home or function as an addition. The city reviews foundation plans, setback compliance, and utility connections the same way it reviews site-built work, and you still need the same inspection sequence. Some prefab panels can speed up framing, but the permit timeline stays the same. We work with Plant Prefab, Tuff Shed, and James Hardie components, and we can tell you which prefab option passes Richardson’s plan review with the fewest corrections. Call (361) 204-4652 for a free consultation on prefab versus site-built in your neighborhood.
Schedule Your Free Estimate in Richardson
Every Richardson addition we build starts with a free, written estimate that names the exact scope, price, and schedule. Nothing is left verbal. If the scope changes later, the price change comes in writing before the work does. That’s the Kingswell Guarantee, and your copy of it comes with the estimate. Call (361) 204-4652 today and ask for Russ Delmar’s team. We’ll walk your lot, check the easements, pull the setback card, and give you a real number for your addition in Richardson.
Written by Russ Delmar, Owner at Lodgewick ADU Dallas, serving Richardson since 2010.
