Austin driveway and sidewalk rules: curb cuts, approaches and fee-in-lieu

The driveway approach is its own permit

The approach is the piece between the roadway and your property line — the part that crosses the public right-of-way. It carries its own construction permit, separately from the building permit.

§25-6-2 splits them into two types. A type 1 approach serves property with a one- or two-family residence. A type 2 serves anything else. Most of what we build is type 1.

§25-6-263(A) sets a presumption in your favour: the city manager shall approve the application unless the proposed driveway is determined to have an adverse effect on vehicle and pedestrian traffic and public safety. Six factors go into that judgement — topography, land use and trip generation, the function of the street including sight distance and operating speed, the location of nearby streets and driveways, the site plan and on-site circulation, and the potential for pushing traffic onto a local residential street.

Two things are simply prohibited under §25-6-263(C): a driveway or curb cut fronting Lamar Boulevard between West 24th and West 30th Street, and any project providing parking between the curb line and the property line unless council specifically directs otherwise.

A new curb cut forces removal of the old one

§25-6-295 is short and routinely overlooked at budget stage. A person who constructs a new driveway approach shall:

• remove an existing curb opening or driveway approach on the same property if it is not required;
• match the new curb, gutter or sidewalk to the existing adjoining curb grade and alignment; and
• install a new curb, gutter or sidewalk, if required, at the same time as the new approach.

So relocating a driveway is two pieces of work, not one — the new cut and the reinstatement of the old. On a lot with a circular drive or two historic openings, that is real money and it belongs in the estimate rather than the surprise column.

One more with teeth: §25-6-266 automatically suspends the permit if the work damages or interferes with public utility equipment, a stormwater drainage facility, or a tree in a pedestrian way, and the permittee had not obtained the owner's consent first. Reinstatement requires compensating for the damage or eliminating the interference. The street tree is the one that catches people.

When a build triggers a sidewalk

This is the part with the biggest cost consequence, and the trigger is broader than most people assume. §25-6-353(A) applies to:

• a building permit for a new building;
• a building permit for an addition that increases the building's gross floor area by 50 percent or more; or
• a relocation permit to move a building from one site to another.

That middle one matters. A large addition to an existing house is not obviously a "sidewalk project", but cross 50% of gross floor area and the requirement attaches.

Two practical reliefs sit in the same division. §25-6-353(D): unless a subdivision or site plan requires otherwise, a sidewalk on a corner lot is required only along the street with the shortest lot frontage — not both. And §25-6-351(D) is the enforcement point: no certificate of occupancy until the required sidewalk is installed, unless a fee has been paid instead.

The fee instead of a sidewalk — and when it is mandatory

§25-6-354 is worth reading closely because part of it is discretionary and part of it is not.

Mandatory. For a sidewalk required under §25-6-353, the director shall approve payment of a fee instead of installation if all three hold:

• the property is used only for a residential use and has not more than two dwelling units;
• on the date the property was subdivided, the land development regulations did not include a sidewalk requirement; and
• less than 50 percent of the block face has a sidewalk.

"Shall approve", not "may". For a one- or two-unit house on an older Central Austin block with a patchy sidewalk record, this is often satisfied — and it is worth checking before assuming the cost.

Also mandatory, for small subdivisions. Under §25-6-354(C) the same obligation applies where the subdivision has five or fewer lots, only residential lots of no more than two dwelling units each, is a resubdivision of land originally subdivided before any sidewalk requirement existed, and less than half the block face has a sidewalk.

Discretionary. §25-6-354(D) lets the director approve a fee where installation is impractical — including where there are no sidewalks nearby and none likely, or where installing one would require removing a protected tree or another major obstruction in the right-of-way.

Note the timing point in §25-6-354(A): the request is filed at the time of the permit application, though an application can be amended later to add it.

Two or three driveways on an infill lot

This is the Transportation Criteria Manual provision that matters most now that HOME allows two and three units on ordinary lots. TCM §7.6.1.1 exists because the general rule pushes hard toward consolidating driveways, and residential infill sites often cannot.

Two driveways. On a lot fronting a Level 1 street with less than 300 feet of frontage and at least two dwelling units proposed, two driveways are allowed if at least 20 feet of spacing can be provided between them.

And that 20 feet may be reduced administratively where a site condition prevents it — the manual lists four:

• existing or proposed utility infrastructure — a power pole, drainage inlet, water meter, wastewater cleanout, manhole or fire hydrant, on site or in the right-of-way frontage;
• an on-site drainage easement;
• protected or heritage trees, on site or adjacent, where the required spacing would cause impacts exceeding the Standard Preservation Criteria in Environmental Criteria Manual Section 3; or
• a slope greater than 8% outside the apron in the right-of-way.

You have to identify which condition applies and document why it constrains spacing, with the permit application.

Three driveways. On a corner lot fronting a Level 1 street with three dwelling units proposed, three are allowed: two along the long side with at least 20 feet between them, one along the narrow side. The long-side driveways must sit at least 10 feet from a storm drain inlet opening edge and 50 feet from a street intersection; the short-side driveway must clear inlets and be at least 30 feet from the intersection. No circular drive connecting the two streets.

A corner lot may in any case have one driveway on each street it fronts, provided each meets the other spacing and offset criteria and they do not form a circular drive.

Shared and joint-use driveways

§25-6-451 permits vehicular access to a tract through a joint-use driveway as an alternative to direct access onto an abutting street. For a single-family residential use, one joint-use driveway may serve not more than eight dwelling units.

That is a genuinely useful ceiling on an infill site where multiple units share one curb cut — and it pairs with the point above, since fewer curb cuts means less reinstatement work.

A limit worth being precise about. §25-6-419 does contain an impervious cover exclusion for joint-use driveways — 110% of the cover required solely to provide access from adjoining land where the driveway sits entirely on your site, or 50% where part of it does not. But that section sits inside the Access to Hill Country Roadways division, and §25-6-417 opens "in this division". It applies to a joint-use driveway required under that division, not to shared driveways generally. The general provision, §25-6-451, carries no impervious cover exclusion.

And even where it applies, the exclusion never covers cover that serves as a parking space or an aisle serving one.

The 14 percent grade cap, and where it applies

§25-6-442 caps driveway grade at 14 percent, unless the portion exceeding 14 percent is at least 25 feet of travel distance from the nearest right-of-way boundary and the department has approved the surface and geometric design.

But read §25-6-441 first: this division applies only to property in a water supply watershed and property in the Barton Springs Zone. On an ordinary urban or suburban watershed lot it is not the governing rule — the Transportation Criteria Manual is.

It is also a reminder of a theme running through this site: the watershed classification reaches into places you would not expect, including how steep your driveway may be.