Building near the coast or a creek in Lafayette, California
Lafayette is inland, so the rules near water are creek setbacks: no buildings or structures (other than fences, paths and drainage work) within a setback that runs 12 to 21 feet from the top of bank, or more for deep or steep channels. The city engineer can grant exceptions with a survey, soils report and recorded hold-harmless agreement.
| Top-of-bank setback, channel 0-6 ft deep | 12 ft each side [3] |
| Top-of-bank setback, channel 18-21 ft deep | 21 ft each side [3] |
| Channel deeper than 21 ft | 3x channel depth from toe of slope [5] |
| Allowed in setback | Fences, paths, pervious surfaces, drainage work, landscaping [6] |
| Exception approved by | City engineer [7] |
| Flood zone (A) lowest floor | 2 ft above base flood elevation [13] |
| Substantial improvement threshold | 50% of market value [12] |
Lafayette is inland
Lafayette has no coastline, so coastal development permits don't apply. "Building near the water" here means creek setbacks and flood-zone rules in Municipal Code Ch. 6-18.
Creek setback
Buildings and structures must be set back from an unimproved creek channel [1]. Where the banks are steeper than 2:1, the setback line is measured from the toe of the slope at twice the channel depth, plus a top-of-bank setback [2] that depends on channel depth [3]:
- 0-6 ft deep: 12 ft each side
- 6-12 ft: 15 ft
- 12-18 ft: 18 ft
- 18-21 ft: 21 ft
Where banks are flatter than 2:1, the table distance is measured from the top of bank [4]. Channels deeper than 21 feet need a setback of three times the channel depth from the toe of the slope [5]. Recorded subdivision creek setbacks control if they differ [14].
What's allowed in the setback
Only fences, pervious surfaces, paths and trails, bioswales and drainage or erosion-control work may be built in the setback. Landscaping, including trees and shrubs, is allowed [6]. The sources don't regulate tree removal near creeks beyond this.
Exceptions
The city engineer may allow a structure in the setback [7] if you submit a topographic survey and a geotechnical soils report on bank stability [8], plus a geotechnical engineer's certification, and record a hold-harmless agreement for flood or erosion damage [9]. The engineer's decision can be appealed to the City Council [10].
Flood hazard areas
Building in a FEMA special flood hazard area needs a city development permit first [11]. New or fully rebuilt homes in an A zone must have the lowest floor at least 2 feet above base flood elevation [13]. Additions or remodels costing 50% or more of the structure's value count as "substantial improvement" [12] and trigger these standards.
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Next steps
- Find out whether your lot borders a creek or lies in a FEMA flood zone (Lafayette Engineering / Planning & Building, see the city website).
- Have a surveyor locate the creek bottom, toe of slope and top of bank to establish the setback line.
- If you want to build inside the setback, submit a topographic survey, geotechnical soils report and engineer's certification to the city engineer, and be ready to record a hold-harmless agreement.
- In a flood hazard area, apply for a floodplain development permit before construction.
- Work in the creek bed or banks also needs state notice to the Department of Fish and Wildlife (see state rules).
Common questions
- How close to a creek can I build in Lafayette, California?
- No buildings or structures (other than fences, paths and drainage work) within a setback that runs 12 to 21 feet from the top of bank, or more for deep or steep channels.
- Can I get an exception to the creek setback in Lafayette, California?
- It depends: the city engineer can grant exceptions with a survey, soils report and recorded hold-harmless agreement.
- Do I need a permit to build in a flood zone in Lafayette, California?
- The page says in a flood zone A the lowest floor must be 2 ft above base flood elevation, and work costing 50% of market value counts as a substantial improvement.
California rules for building near the coast and creeks
California has no statewide shoreland setback. Near water, two state laws matter most.
The coastal zone (Coastal Act, Pub. Res. Code §30000 et seq.):
- Almost any development in the coastal zone needs a coastal development permit (CDP) (§30600). "Development" is broad: buildings, additions, grading, lot splits, removing major vegetation, and changes in intensity of use (§30106).
- The zone generally runs about 1,000 yards inland from mean high tide (up to 5 miles in some habitat areas, less in some cities). San Francisco Bay is excluded; BCDC regulates it (§30103).
- Where a city or county has a Local Coastal Program (LCP) certified by the Coastal Commission, it issues the CDP (§30519). Otherwise the Commission does.
- Local approvals can be appealed to the Coastal Commission for projects between the sea and the first public road, within 300 ft of a beach or the mean high tide line, within 100 ft of a wetland, estuary or stream, or within 300 ft of a coastal bluff (§30603).
- Some improvements to existing homes and repairs are exempt (§30610), with exceptions set by regulation.
Creeks, streams and lakes statewide: you must notify the Department of Fish and Wildlife before work that diverts or blocks a stream, changes its bed, channel or bank, or puts material into it (Fish & Game Code §1602), even for streams that are dry part of the year. CDFW may require a Lake or Streambed Alteration Agreement.
Cities and counties often add their own creek setbacks or riparian buffers.
What the ordinance says
- Sec. 6-1841(a) Structure setback, Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
As defined by Section 6-312 and Section 6-355, buildings and structures shall be set back from an unimproved creek channel as follows:
- Sec. 6-1841(a)(1), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
If the side slopes of the channel are steeper than 2:1 (horizontal:vertical), the width of the setback is determined by a line measured from the toe of the slope a distance of twice the channel depth plus the appropriate top-of-bank setback as follows:
- Sec. 6-1841(a)(1) table, Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
0—6 12 each side 6—12 15 each side 12—18 18 each side 18—21 21 each side
- Sec. 6-1841(a)(1), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
If the side slopes of the channel are flatter than 2:1 (horizontal:vertical) the setback is as indicated in the table above, measured from the top of the bank.
- Sec. 6-1841(a)(2), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
If the depth of a channel exceeds 21 feet, the width of the setback is determined by measuring from the toe of the slope a distance of three times the channel depth.
- Sec. 6-1841(c), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
No structure other than fences, pervious surfaces, public access paths, trails, bioretention basins, bioswales, and drainage and erosion protection improvements may be constructed within the setback area. Landscaping (including trees and shrubs) is permitted within the setback area.
- Sec. 6-1842(a) Exception, Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
The city engineer may approve exceptions to the requirements of Section 6-1841 to allow construction of structures within the setback area if:
- Sec. 6-1842(c)(1)-(2), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
A topographical survey of the lot precisely showing the creek bottom, sides, top of bank and proposed and existing structures or other development; (2) A soils report prepared by a licensed geotechnical engineer which describes the soils condition for the proposed structure and analyzes and makes recommendations as to the creek bank stability and erosion hazard; and
- Sec. 6-1842(a)(2), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
The property owner agrees to enter into and record an agreement holding the city and other public agencies harmless in the event of flood or erosion damage.
- Sec. 6-1842(d), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
The decision of the city engineer may be appealed to the city council as provided in Section 6-1852(b).
- Sec. 6-1821 Establishment of development permit, Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
A development permit must be obtained before construction or development begins within any area of special flood hazard established in Section 6-1812.
- Sec. 6-1804 Definitions, Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
"Substantial improvement" means any reconstruction, rehabilitation, addition or other proposed new development of a structure, the cost of which equals or exceeds 50 percent of the market value of the structure before the "start of construction" of the improvement.
- Sec. 6-1834(a)(2) Elevation and floodproofing, Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
In an A zone, elevated at least two feet above the base flood elevation, as determined by the community;
- Sec. 6-1841(b), Municipal Code Title 6 Ch. 6-18 Flood Damage Prevention (Art. 5 Creek Setback Requirements, 6-1841 setback formula)
If a parcel is subject to subdivision easements or setback requirements under Contra Costa County Ordinance Code Sections 914-14.002 through 14.014 which are inconsistent with Section 6-1841(a), those subdivision requirements control.