Hillsborough repair guide
Hillsborough fences: open hillside edges are not solid garden enclosures in Hillsborough, CA
Review Hillsborough fence and gate changes against hillside visibility, the home's materials, drainage and authorization before copying a damaged section.
On an applicable hillside parcel, an outlying fence has a different visual role from fencing close to the residence. A repair that changes opacity or location can become a design question.
Sources: Hillsborough Landscape · Hillsborough Review · Hillsborough Drains · Usda Decay
Locate the barrier within the hillside design
The Town's hillside landscape amendment favors visually open outlying/perimeter fencing and places solid board fencing close to the residence. It also calls for materials compatible with the home's architecture. This is a specific hillside design principle, not a townwide fence-height exemption.
Record the existing material, position and gate function without assuming that a remaining section proves the proposed replacement is acceptable. Confirm the property boundary and who can authorize work.
Sources: Hillsborough Landscape · Hillsborough Review
Screening must not conceal the water problem
The same amendment discusses drains and planting as site elements. If boards or posts are repeatedly wetted by planting beds or runoff, the water route deserves separate review; the presence of screening is not evidence of decay or a reason to block drainage.
Do not dig at supports, add a solid base, force a catching gate or adjust powered equipment. A qualified assessment should distinguish material deterioration from movement and confirm any landscape/design approvals. The planner cannot receive real photographs or book the work.
Sources: Hillsborough Landscape · Hillsborough Drains · Usda Decay
Local context behind the decision
Housing
The 2014 Housing Element recounts estates subdivided while some original houses remained. Its 2007–2011 ACS table documents a substantial 1950s-or-earlier cohort alongside 1960s/1970s development. This is historical context for checking alterations, not a current stock count, a designation of every older house as historic or evidence of disrepair.
Sources: Hillsborough Housing
Materials
Town guidance discusses locally observed stucco treatments and compatible stone and wood facades. It names shingles, board-and-batten and horizontal siding in the Peninsula's Bay Region design vocabulary. This supports attention to profiles and material junctions but does not measure the share of Hillsborough homes using any material or species.
Sources: Hillsborough Materials
Moisture
Hillside guidance addresses contours, retaining features and vegetation; the Town's storm-drain page confirms a runoff system feeding creeks and the Bay. On an individual site, roof discharge, slope runoff or landscape wetting may prolong moisture contact with wood. Those are conditional mechanisms, not evidence of universal fog, salt exposure, flooding or decay.
Sources: Hillsborough Hillsides · Hillsborough Drains · Usda Decay
Questions about this Hillsborough topic
Can an open hillside fence be replaced with solid boards?
That changes the design question. The applicable hillside amendment distinguishes the two; obtain current, site-specific review.
Does matching the house's color settle the fence design?
No. Location, openness, materials, grade and authorization can matter independently of color.
FAQ synthesis references: Hillsborough Landscape · Hillsborough Review · Hillsborough Drains · Usda Decay
Keep the scope in context
Sources and their limits
Source scope matters: a historic district does not describe every home, and regional exposure is not a property diagnosis. These references are links only.
Wood Handbook, Chapter 14: Biodeterioration of Wood (2021)
USDA Forest Service, Forest Products Laboratory · Direct source checked · accessed 2026-09-19
Scope: National wood science; original publication abstract inspected, not a city damage survey.
Evidence: Fungal growth depends on suitable temperature, moisture and oxygen. Fungi can cause mold, stains or decay; chemical staining can resemble fungal staining. A visible stain is not by itself a decay diagnosis, and the source supplies no Bay Area prevalence estimate.
Hillsborough Housing Element, adopted October 2014
Town of Hillsborough · Direct source checked · accessed 2026-09-19
Scope: Historical baseline only: PDF pp. 4–5, 12 and 92; age table uses 2007–2011 ACS. Superseded as a policy document.
Evidence: Recounts large estates gradually subdivided while some original houses remained on portions of the land. The historical stock was overwhelmingly detached housing; the age table includes a substantial 1950s-or-earlier cohort and later 1960s/1970s development. Narrative wording about age is imprecise relative to the table, so no percentages or 'almost all' claim are repeated. cannot determine current condition or material distribution.
Residential Design Guidelines, Chapter 6: Materials and Finishes
Town of Hillsborough · Direct source checked · accessed 2026-09-19
Scope: Printed pp. 37–42; local design guidance, not measured prevalence by material.
Evidence: Discusses locally observed stucco techniques, compatible stone, and wood siding as primary or secondary facades; Bay Region Style examples on the Peninsula use shingles, board-and-batten and horizontal siding. Trim/molding, fastening and adjacent materials should match the building's style and scale. This documents a design vocabulary, does not demonstrate that any given house uses redwood or wood framing.
Residential Design Guidelines, Chapter 4 hillside amendment, May 2015
Town of Hillsborough · Direct source checked · accessed 2026-09-19
Scope: Five-page hillside-specific amendment; applies by site conditions, not to all houses.
Evidence: Addresses contour-sensitive grading, access constraints, stepped building forms and retaining walls. Its deck section gives special consideration to overhanging/cantilevered decks, discourages excessive exposed piers and relates the deck-to-grade distance to the natural hillside. This is design/site evidence, not an engineering approval of an existing deck.
Residential Design Guidelines, Chapter 11 hillside landscape amendment, May 2015
Town of Hillsborough · Direct source checked · accessed 2026-09-19
Scope: Hillside landscape section E, two pages; not a townwide fence-height code.
Evidence: Calls for retaining significant tree/landform character. Visually prominent perimeter/outlying fences should be open in design; solid board fencing is placed close to the residence. Fence design/materials should complement the home; visible drains are addressed separately. Screening must not be confused with permission to obstruct drainage.
Storm Drains
Town of Hillsborough · Direct source checked · accessed 2026-09-19
Scope: Original HTML paragraphs inspected after readability returned only navigation.
Evidence: The Town maintains drainage inlets carrying stormwater toward local creeks and San Francisco Bay. Storm drainage differs from sanitary sewers; paint, chemicals and debris must not be dumped into it. This verifies an actual stormwater pathway, not flood or rot prevalence at residential parcels.
Residential Design Guidelines overview
Town of Hillsborough · Direct source checked · accessed 2026-09-19
Scope: Municipal overview inspected September 2026; scope confirmation still required for a proposed repair.
Evidence: Explains that most design changes require design approval as well as permitting and that guidance includes houses, additions, landscaping, fencing and gates. Guidelines supplement dimensional development standards rather than replacing them.
Before your Bay Area scope review
Read the guide for the decision ahead.
A photograph starts the conversation; concealed material and the water source need their own assessment.
- What changes the cost of a dry-rot repair?
- How to prepare for a wood-rot assessment without disturbing the damage
- A leak was fixed. Is the wood ready to close up?
- More damage appeared after opening: what should a revised repair scope explain?
- After a wood-rot repair: a practical homeowner closeout checklist
- Rotted Window Sill: Repair or Replace?
- Residential and Commercial Water-Damage Repair: Which Trade Handles Each Stage?
- Commercial Interior-Trim Water Damage: Plan Access and Finish Boundaries
- Dry Rot, Water Damage or Moisture Damage? Understanding the Repair Question
- Mold and Damaged Wood: What Must Be Resolved Before Repairs?
- Water Stain or Deteriorated Wood? What Safe Photos Can Show
- Water-Damaged Door Thresholds: Define the Repair Boundary
- Patio-Door Surround Damage: Separate Carpentry from the Door Unit
- Fascia and Soffit Water Damage: Repair Scope After the Water-Source Review
- Lower Siding and Trim Moisture Damage: Where Should the Scope Stop?
- Water Damage Below a Kitchen Sink: Cabinet Base, Floor or Both?
- Ceiling Damage After an Upstairs Leak: What Belongs in the Repair Proposal?
- Deck and Balcony Moisture Damage: Boards Are Not the Whole Assembly
- Crawlspace Moisture and Damaged Wood: Coordinate the Right Specialists
- Dry to the Touch Is Not the Same as Sound Wood
- Drying Equipment and Wood Repair: Two Different Parts of a Water-Damage Project
- Water-Damage Repair Records for Property Owners and Managers
Project examples do not establish your property's condition or a local project address. Confirm coverage, service fit and availability for your address.
Ready to look at your Bay Area repair?
Talk it through with Bat and Joe. Describe what you are seeing, where the property is and when it started; the scope is confirmed on site, not from a photo.