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Two front doors are prevalent on late 19th and early 20th century homes, and to the people of those eras, the two distinct front doors made perfect sense; but not anymore. The dual duty leaves you wondering why and which door to use. What social faux pas could you commit if you use the wrong door? It turns out, with a little research, your choice depends on your role, gender and occasion. But let's first dive into why our ancestors ever built a house with two front doors.

1. Formal vs. Informal Entrances
A prevalent reason for dual front doors was to separate formal and informal areas within the home. One door typically led to a parlor or sitting room used for receiving guests, while the other provided access to the family's everyday living spaces. This separation allowed homeowners to maintain a clear distinction between public and private areas, preserving the formality of certain spaces. 
2. Architectural Symmetry
Symmetry was a valued aesthetic in architectural design during the 18th and 19th centuries. In homes lacking a central hallway, adding a second front door created a balanced and visually pleasing facade. 
3. Cost and Availability of Glass
During this period, glass was an expensive material. Homeowners often opted for additional doors instead of windows to allow natural light into their homes, as doors 
required less glass and were more affordable. 
4. Ventilation and Climate Control
Before the advent of modern heating and cooling systems, homes relied on natural ventilation. Having two front doors allowed for better airflow, helping to regulate indoor temperatures, especially in warmer climates. 
5. Cultural and Functional Considerations
In some regions and cultures, two front doors served specific purposes. For example, in Amish and Mennonite communities, separate doors were designated for men and women during church services held in homes. Additionally, in certain homes, one door was used exclusively for funerals, allowing mourners to enter and exit without disturbing the household. 

Decline of the Two-Front-Door Design
As architectural styles evolved and societal norms changed, the need for two front doors diminished. The rise of central hallways, open floor plans, and modern HVAC systems reduced the functional benefits of dual entrances. Furthermore, the formal entertaining practices that necessitated separate spaces became less common, leading to a preference for single, more prominent entryways.

Okay! Okay! But how does or how did anyone ever know which door to knock on?
1. Cultural Norms and Community Knowledge
In tight-knit rural communities or religious groups (like the Amish or Mennonites), people understood and respected the customs. For example, it was common knowledge in those groups that men entered through one door and women through another, especially during services or community gatherings held in homes.

These customs were passed down orally and reinforced by community behavior, so there was little confusion among those familiar with the traditions.

2. Visual Cues and Design Features
Formality of the Door: The more ornate or central door usually indicated the formal entrance (often the one leading to the parlor). This might feature:
-A transom window
-A decorative trim or sidelights
-A more prominent stoop or portico

Placement of the Walkway: Often, a front path would lead directly to the "main" or formal door, while the second might have no walkway or be closer to the side of the porch.

Porch Furniture or Decor: The informal entrance might have utilitarian items—shoes, tools, or seating—suggesting that it was for daily use by family or close friends.

3. Social Etiquette and Habit
It was generally expected that: Strangers, clergy, or formal guests would use the parlor/front door (often unused in day-to-day life except for special occasions).

Friends, neighbors, or tradespeople would use the family door, usually leading into a more informal room like the kitchen or family room.

Visitors would typically approach slowly and might even call out or knock to signal their presence, giving the homeowner a chance to direct them if needed.

4. Instructions or Invitations
In cases like home churches, wakes, or events, hosts might tell people in advance which door to use.

Sometimes signs or even subtle seasonal decor (like a wreath or mat) might be used to indicate the appropriate entrance, especially in later years as customs began to wane.

Think of it like modern homes with a front door and a side garage door—most people intuitively go to the front door unless they're family or told otherwise. In earlier times, that same unspoken logic applied, reinforced by stronger social customs.

That's all interesting, but that second front door today seems random today. Is it a functional obsolescence for appraisers? What impact does the dual doors have on real estate market value.
In today's real estate market, the presence of two front doors in historic homes can have varying effects on property value:

Positive Aspects:
Historical Charm: Homes with original features, such as dual front doors, often appeal to buyers interested in historical authenticity and architectural uniqueness.

Potential for Dual Use: The separate entrances can be advantageous for homeowners looking to create a home office, rental space, or in-law suite with its own access point.

Negative Aspects:
Buyer Confusion: Some potential buyers may be puzzled by the dual entrances, mistaking the home for a duplex or being unsure of the layout.

Curb Appeal Concerns: If not well-maintained or integrated into the overall design, two front doors can disrupt the aesthetic appeal of the home's facade.

Ultimately, the impact on market value depends on the home's condition, location, and how the dual doors are presented and utilized. In historic districts or among buyers seeking distinctive architectural features, two front doors can be a selling point. However, in markets favoring modern designs, they may require thoughtful marketing or potential renovation to align with buyer expectations.

In conclusion, the two-front-door design in 19th and early 20th-century homes was a multifaceted feature influenced by social customs, architectural preferences, and practical needs. While its prevalence has declined, understanding its origins provides valuable insight into historical living practices and can inform decisions in the preservation and marketing of historic properties. Knowing original intent can lead a current owner of the old house on ways to use the two-front-door in an authentic way.