Page 211 - Healdsburg, CA Citywide Design Guidelines

Additions to Historic Structures FIGURE 8.12:
An addition should be compatible with the primary structure and
not detract from one’s ability to interpret its historic character. ADDITIONS TO
HISTORIC COMMERCIAL

8.48 Place an addition at the rear of a building, or set it STRUCTURES
back from the front, to minimize the visual impacts. Original Building
a. This will allow the original proportions and character to
remain prominent. An original one-story building,
b. Where an addition to a historic structure is visible from before an addition.
the public realm, choose architectural features – such
as windows and doors – that are similar in profile to the
architectural features of the existing structure.

8.49 Design a new addition to be a product of its own time.
a. Do not attempt to replicate the appearance of the
historic structure.

8.50 Design a new addition to respect the mass and scale of
the original structure. New Addition to the Side
a. An addition should be simple in design to prevent it
from visually competing with the primary facade.
b. For a larger addition, break up the mass of the addition
into smaller modules that relate to the historic house.
c. To keep the size of a higher mass as small as possible,
use a lower plate height.

8.51 Design a new addition to respect the historic materials
and character-defining features of the historic
structure.
a. Do not destroy, damage or obscure original historic New Addition to the Side and Roof
materials.
b. Do not destroy, damage or obscure historic character-
defining features.

8.52 Utilize a roof form for a new addition that is in
character with the original structure.
a. When constructing a rooftop addition, keep the mass
and scale subordinate to the primary building.

ADUs ON A HISTORIC
PROPERTY

Where the construction of an
Accessory Dwelling Unit (ADU) is
desired on a historic property, refer
to Chapter 5 for design guidelines
and more information.
Figure 8.11: Place an addition at the rear of a building, or set it back
from the front, to minimize visual impacts.
Treatment of Historic Resources Chapter 8 203