Octagon
Eight-sided plans, broad porches, and substantial woodwork give these nineteenth-century houses their distinctive character.
What Is Octagon?
An octagon house has an eight-sided main plan. The form became fashionable in the United States during the mid-nineteenth century, encouraged by Orson Squire Fowler’s 1848 book, A Home for All. Fowler argued that octagonal houses could provide more interior space for a given amount of exterior wall, reduce building and heating costs, and improve daylight and ventilation.
The octagonal plan accommodated a variety of architectural treatments. Builders drew on Greek Revival, Gothic Revival, Italianate, and other contemporary designs, adapting entrances, cornices, porches, and interior woodwork to local tastes. The house’s eight-sided form established its overall shape, while its architectural details gave individual rooms and façades their character.
The Collection
Octagon Characteristics
Octagon houses organize their principal building form around an eight-sided plan. Low roofs, broad cornices, and porches extending around several sides emphasize the distinctive outline. Windows distributed around the exterior bring light into rooms from different directions, while central stairs and cupolas contribute to the arrangement of many examples. Architectural ornament varies with the period style chosen for the building.
- Eight-sided main plans
- Low-pitched hipped roofs
- Broad eaves and projecting cornices
- Central cupolas or roof lanterns
- Porches wrapping around multiple sides
- Windows distributed around the exterior
OCTAGON MOULDINGS
The mouldings shown in this collection draw primarily on Greek Revival design. Substantial door and window casings, projecting headers, prominent cornices, and tall baseboards establish a classical framework. Broad surfaces and carefully shaped profiles create depth and reinforce the woodwork’s strong horizontal lines.
These details offer one historically appropriate approach to finishing an octagon house. Other examples used Italianate ornament or different Victorian-era treatments. The selection and arrangement of mouldings should reflect the architectural character of the house and its individual rooms.
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Period Details & Drawings
History of Octagon
Octagonal forms appeared in architecture long before the nineteenth-century American house movement. Ancient Roman monuments and early Christian baptisteries used eight-sided plans for ceremonial and religious buildings. In the United States, Thomas Jefferson’s Poplar Forest, begun in 1806, demonstrated an earlier use of the octagon for a private residence.
Orson Squire Fowler brought the form to a wider audience through his 1848 publication, A Home for All, and subsequent editions, articles, and lectures. He promoted the octagon as an economical and healthful alternative to conventional house plans. Its compact geometry, he argued, could enclose more space with less exterior wall, while windows on multiple sides and a central cupola could improve light and ventilation. These proposals reflected a broader nineteenth-century interest in domestic reform and practical innovation.
Fowler’s ideas encouraged the construction of octagon houses throughout the United States and parts of Canada, with particular enthusiasm during the 1850s. Builders adapted the concept to different materials, budgets, and regional traditions. Interior arrangements could combine rectangular principal rooms with smaller triangular spaces used for closets, passages, or secondary rooms, accommodating everyday activities within the unusual exterior form.
Architectural details followed contemporary fashions. Greek Revival examples used classical entrances, substantial cornices, and carefully proportioned woodwork, while others incorporated Gothic Revival or Italianate features. The Henry L. Russell House in Iowa, built in 1859, combined a plan closely related to Fowler’s published designs with Greek Revival details, illustrating the compatibility of the octagonal form and classical ornament.
The octagon remained an uncommon house type, and its principal period of popularity was relatively brief. Construction nevertheless continued in some communities after the Civil War, and the form also appeared in schools, churches, barns, and other buildings. Surviving examples preserve both the experimental planning of the movement and the varied architectural traditions expressed through their exterior details and interior woodwork.
