Driveway extensions and parking pads

Common extension projects

Most extension jobs fall into a few types. Each one has its own details, but they all come down to the same two questions: how will the new slab connect to the old one, and what's going to sit on it?

• Widening. Adding a few feet along one or both sides so you can open car doors without stepping in the grass.
• Parking pads. An extra spot beside the drive or off the side of the garage for a third car or a work truck.
• Side extensions. Running a strip down the side of the house to a gate, a backyard or a side-entry garage.
• RV, boat and trailer pads. A heavier slab built for weight that sits in one place for months.

The base build is our standard: compacted base, 4 inches of 3,500 PSI ready-mix, rebar on 18-inch centers set on chairs, control joints and a broom finish. The heavy-duty version is covered below.

Tying new concrete to old

This is where extensions go right or wrong. A new slab poured loose against an old one will settle or heave on its own schedule, and in a couple of years you get a lip you trip over or catch a mower on.

We drill into the edge of the existing driveway and set steel dowels, then pour the new slab around them. The dowels hold the two slabs level with each other while still letting them move a little lengthwise. Between old and new we put an expansion joint. That's standard on every job where new concrete meets concrete that's staying.

If the edge of the old driveway is cracked, crumbling or already settled, we'll tell you. Doweling into bad concrete doesn't fix it. Sometimes the right move is to cut back to a solid line, or replace the section that's failing.

RV, boat and trailer pads

A loaded RV or a boat on a trailer puts a lot of weight on a few small tire patches, and it sits there for months. A standard 4-inch driveway isn't meant for that. For these pads we go to 5 inches with heavier steel, and we offer a 4,000 PSI upgrade. The PSI section of the guide explains when the upgrade is worth it.

Two other things to plan for:

• The path in. If the RV crosses your existing 4-inch driveway to reach the pad, that part of the drive takes the same load. We'll talk through whether it needs to be upgraded too.
• Cure time. Heavy trucks, trailers and dumpsters stay off for 28 days. Cars can go on after 7.

New next to old: the color question

New concrete is lighter and more even than a driveway that has been out in the Texas sun for 15 years. Old concrete picks up tire marks, oil, stains and weathering. Right after the pour, the line between old and new is obvious.

It softens with time, but it won't fully disappear. A few ways people handle it:

• Accept the line and keep it clean. A straight joint with a neat edge looks intentional.
• Pressure wash the old drive before the pour so the gap is smaller on day one.
• Replace the whole driveway at once, if the old one is near the end of its life anyway. See driveway replacement in DFW.

Permits, width limits and the apron

We pull permits. City fees are billed at cost, usually $0 to about $300. Whether you need one depends on the city and on what the job touches. Anything that changes the apron at the street or the curb almost always needs one.

Some cities limit how wide a driveway can be at the street, or how much of the front yard can be paved. The rules vary from city to city, so we check before we draw anything up. If a wider drive means a wider apron, that apron gets built to the city's spec: 6 inches thick, 3,500 or 4,000 PSI, rebar on chairs and dowels into the gutter. Our driveway apron page covers how that works and who pays for it.

Drainage on extensions

More concrete means more runoff, and that water has to go somewhere. A new pad along the side of the house can easily send water toward the foundation or into a neighbor's yard if it's sloped wrong. We set the slope so water heads to the street or the yard, away from the house.

North Texas sits on Blackland Prairie clay. It swells when it's wet and shrinks when it's dry, and water pooling along the edge of a slab is what drives most of the movement you see. Getting the slope right on an extension protects the new slab and the house next to it. The soil section of the guide goes into this.

What it costs

Small slabs cost more per square foot than big ones. The truck, the crew, the forms and the setup cost about the same whether the pad is 200 square feet or 900. In our data from 85 DFW driveway replacements quoted in October 2026, jobs under 400 square feet had a median of $16.28 per square foot. Jobs between 400 and 700 square feet ran $15.17. New pours with no tear-out had a median of about $15.86, mostly on small slabs.

Things that move the price on an extension: the size, any grass or old concrete to tear out, whether it's a 5-inch heavy pad, the finish and whether the job touches the apron. The driveway cost calculator gives you a starting number.

Send us a photo of the driveway from the street and one from the side, and start your estimate. We usually have a written, itemized number back within one business day.

Questions people ask