Home Addition Contractor Serving McKinney, Collin County, and North Texas
Need more room without leaving your neighborhood? EXL Extreme Line Construction builds home additions across Princeton, McKinney, and Collin County, from room additions and primary suites to kitchen expansions, garage conversions, second-story additions, and in-law suites. You get upfront pricing, insured and bonded work, a workmanship warranty, financing, and a free estimate before anything starts.
Moving costs more than most families expect. Add up the agent fees, the new mortgage rate, and the packing costs, and the total adds up fast. A home addition skips all of that. You keep your street, your school zone, your short commute, and the backyard you already set up. You also add the rooms your family is short on. Many homes around Princeton, McKinney, and the rest of Collin County sit on lots with room to grow. That could mean a kitchen bump-out, a back-of-house addition, or a full second story. EXL handles the layout, structure, permits, and finishes, so the new space looks like it was part of the house from the start.
A well-built addition does more than add space. It can change how your home lives day to day. It can also raise what your home is worth at resale. The right project depends on your home, your lot, and your budget, so EXL helps you weigh that before you commit.
Common reasons homeowners call us for home additions
Planning a home addition in Princeton, McKinney, or Collin County? Start with a free estimate and a clear scope before construction begins.
EXL builds home additions across Collin County with honest pricing and clean, dependable work.
A home addition has to connect to the house you already have, so we do the planning before construction starts. We look at the layout, foundation, roofline, utilities, permits, and access early so the project is clear before anything is opened up.
We start with a conversation about what you want to add and why you need the space. It may be a larger kitchen, a primary suite, an extra bathroom, a family room, or a garage conversion. We’ll talk through the basic scope, your budget range, and whether the project makes sense for the home and lot.
Next, we walk the home with you and look at the area where the addition would go. We measure the existing rooms, check how the new space can tie into the current layout, and look for early issues with the roofline, foundation, utilities, access, setbacks, or HOA rules.
A few things we usually ask:
After the visit, we turn the idea into a practical layout and written scope. This keeps the project clear before work starts, including what is included, what areas of the home are affected, and what decisions need to be made.
If the addition needs engineering, permits, or HOA approval, we handle that before construction begins. This is where the foundation, framing, roof connection, utility tie-ins, and city requirements are planned so the build can move forward the right way.
Before work starts, we review the schedule, material selections, work area, staging plan, and how the home will be protected. This gives you a clear picture of what happens first, where materials will go, and how we’ll keep the project organized.
Once the plan is approved, we build the addition in the proper order. Depending on the project, this can include:
City inspections are scheduled at the required stages, and we keep you updated as the work moves forward.
When the addition is finished, we walk the space with you and take care of the final punch list. Once everything is complete, the new space is ready to use and the work is backed by our written workmanship warranty.
Home additions are not one-size-fits-all. Some homeowners need one extra room, while others need a larger kitchen, a private suite, more family space, or a separate area for guests or relatives. We build home additions across Princeton, McKinney, and Collin County that are planned around the existing home, lot, structure, and daily use.
A kitchen expansion adds square footage, which is different from a kitchen remodel that keeps the same footprint. EXL builds kitchen additions for more cabinet space, wider walkways, pantry room, island clearance, or a better link between the kitchen, dining area, and backyard. For a kitchen that keeps its current footprint, see the kitchen remodeling page.
A primary suite addition can add a larger bedroom, walk-in closet, and private bathroom without moving to another home. These additions are planned around privacy, plumbing access, roof tie-ins, and how the new suite connects to the existing layout.
We build bathroom additions as hall baths, powder rooms, guest baths, or bathrooms connected to new bedroom suites. Plumbing layout, ventilation, waterproofing, and tile work are planned before the finishes are selected.
A family room addition gives the home more shared living space without taking over bedrooms, dining rooms, or garage space. These additions are planned around the existing opening, framing, HVAC, windows, and exterior match.
Garage conversions can turn unused garage space into an office, guest room, gym, family room, or in-law space. We plan the floor height, insulation, electrical, HVAC, windows, doors, and exterior finish so the space works like part of the home.
A second-story addition is an option when the lot does not have room to build out. Before planning bedrooms, bathrooms, or a loft upstairs, EXL checks the existing foundation, framing, stairs, roofline, and load path. The point is to be sure the home can carry the weight. New bedrooms upstairs are built with egress windows for safe exit.
A sunroom or enclosed patio adds usable space off the back of the home. It needs the right glass, insulation, airflow, roof connection, and HVAC for North Texas heat. See more on the outdoor living additions page.
We build home office and studio additions for homeowners who need a separate room for work, calls, storage, lighting, and privacy without taking over another room in the house.
Laundry room and mudroom additions can make the home more organized with durable flooring, storage, a utility sink, folding space, bench seating, cubbies, or better access from the garage, kitchen, or back entry.
In-law suite and ADU-style additions can add a private bedroom, bathroom, sitting area, kitchenette where allowed, or separate entrance. These projects start with checking the lot, setbacks, zoning, HOA rules, and how the new space connects to the main home.
A few North Texas conditions decide whether an addition holds up. EXL plans for all of them.
Most of Collin County sits on Blackland Prairie clay. This soil swells when it rains and shrinks in the heat. It is the top cause of foundation cracks in North Texas. EXL builds the new foundation to move with it:
Collin County falls in Climate Zone 3A, so EXL builds the new space to stay comfortable and keep bills down:
New rooms add load, and older McKinney and Plano homes sometimes need an upgrade:
DFW sits in the worst hail belt in the country, so the roof and exterior have to match the house and hold up:
Adding square footage means city permits in every Collin County city, plus HOA approval in many neighborhoods. EXL handles:
We handle home addition permit planning for projects in Princeton, McKinney, Allen, Plano, Frisco, and nearby Collin County cities. Depending on the city and the scope of work, the permit package may include a site plan, floor plan, framing details, energy compliance information, and engineering documents when required.
Most home additions also need inspections during the build, including foundation, framing, electrical, plumbing, HVAC, insulation, and final inspection stages. If the home is in an HOA neighborhood, architectural approval may also be needed before work starts.
Typical path:
While permits are in review, we prepare the schedule, materials, and trade coordination so the project is ready to move once approvals are in place.
Every home is different, but here are the honest ranges we see across Collin County and North Texas. These cover the build, typical finishes, and project management. High-end finishes, a tricky structure, or extra foundation work on our clay soil can increase the numbers significantly.
EXL gives you upfront pricing once the scope, structure, and finishes are set, so you know what is included before work starts. Any change after that is put in writing before the work changes. Financing is available on larger additions.
Weather, permits, inspections, material lead times, and the size of the addition can all affect the schedule. We build realistic timelines before work starts and keep you updated as the project moves.
Typical timeline ranges:
You will receive a project schedule with major milestones, and we update it as permits, inspections, materials, and weather conditions affect the build.
Most families can stay in the home during an addition, especially when the new space is being built off the side or back of the house. We separate the work area from the living area and manage the jobsite so daily life can continue with less disruption.
We protect the home and control the work area with:
Work areas stay separated and secure, so kids, pets, and daily living spaces are kept clear of construction as much as possible.
North Texas heat, hail, storms, and clay soil are hard on a house. For a home addition, we recommend materials that match the existing home and hold up to local conditions.
Flooring
Tile and rigid-core luxury vinyl work well for slab homes, pets, and heavy traffic. For tile over concrete, the right underlayment and movement joints help reduce cracking from normal slab movement.
Cabinets
Plywood cabinet boxes, soft-close hardware, and durable finishes hold up better than cheap particleboard in kitchens, bathrooms, laundry rooms, and mudrooms.
Countertops
Quartz is tough and low-maintenance, but hot pans still need a trivet. Granite and natural stone handle heat well but need sealing.
Windows
Low-e glass helps cut heat gain, especially on west- and south-facing walls. We look at window direction, glass rating, and room use before framing.
Insulation
Spray foam or a tight batt-and-air-seal approach helps the new space hold temperature and keeps the addition from feeling too hot or too cold.
Roofing
Class 4 impact-resistant shingles are worth a look in hail-prone areas and may qualify for insurance savings, depending on the carrier. we match the existing roof where possible or discuss re-roofing if needed.
Exterior
Brick, fiber-cement siding, flashing, sealants, trim, and paint need to tie into the existing home so the addition looks original and keeps water out.
Bathroom Waterproofing
For bathroom additions, waterproofing belongs behind the tile. Tile and grout are not enough by themselves.
EXL studies setbacks and shapes the addition to fit.
materials are sourced and tested before they go up.
upgrades are planned early, not discovered mid-build.
the new foundation is tied into the existing one and planned for clay soil.
the lot is graded so water moves away from the slab.
valleys and flashing are reworked so the roof does not leak.
EXL prepares the approval packet so the project keeps moving.
every change is priced and put in writing first.
foundation and exterior work are scheduled around the forecast.
A short list helps us understand the project faster.
Tell us what room would make your daily life easier: a bigger kitchen, a private office, an extra bathroom, or more family space.
EXL builds home additions across Collin County and North Texas, including Princeton, McKinney, Allen, Plano, Frisco, Prosper, Melissa, Celina, Anna, Fairview, Lucas, and Wylie. Each city has its own lot sizes, setbacks, permits, and HOA rules, and EXL plans around the one you are in.
We keep you updated as the work moves forward, so you are not left guessing what is happening at your home. You will get progress updates, schedule reminders, photos when they help explain the work, and written change orders before anything changes. At the end of each workday, we clean up the area and keep the site organized for the next step.
EXL Extreme Line Construction builds home additions and room additions across Princeton, McKinney, and Collin County, with upfront pricing, financing, and a workmanship warranty. Start with a free estimate and a clear plan for the space you need.
New space built onto your existing home, like a bedroom, bathroom, primary suite, or family room. It adds square footage and ties into your current foundation and roof.
They overlap. A room addition usually means one room. A home addition covers anything from one room to a primary suite, a second story, or a full expansion. EXL builds both.
Yes. Adding square footage is permitted work in Princeton and across Collin County. EXL pulls the permits and handles the inspections.
Yes. EXL builds across McKinney, Princeton, Allen, Plano, Frisco, and the rest of Collin County and North Texas.
Bedrooms, bathrooms, primary suites, kitchens, family rooms, home offices, sunrooms, mudrooms, in-law suites, and ADU-style units. Garage conversions and second-story additions are options too.
Yes. When the lot is full, EXL builds up after checking the foundation can carry the load and planning the stairs and framing.
Yes. EXL raises the floor, insulates the walls and ceiling, adds windows, ties in HVAC and electrical, and finishes the exterior where the garage door was.
Yes. EXL builds in-law suites inside the home and separate ADU-style units, after checking your zoning and setbacks.
That is the goal. EXL matches the roofline, brick or siding, and finishes so the addition looks original, not added on.
It depends on the size, structure, finishes, and whether a kitchen or bath is involved. EXL gives upfront pricing once the scope is clear, and financing is available.
It depends on the scope, permits, and material lead times, so EXL gives a realistic timeline with your estimate. Weather can affect foundation and exterior work.
Usually, yes. The new space is built off to the side, and EXL separates the work area, controls dust, and keeps safe paths for kids and pets
Yes. EXL offers financing through a lending partner, so a larger addition can be spread out over time.