A house design is the sum of five form decisions: roof, massing, plan, openings and cladding. Change one and the house changes character. Get them to agree and a modest house looks considered; leave them in conflict and an expensive house looks confused. This guide explains each decision, how they interact, and how to test them before committing to a design.
It is written for people planning a new house, a custom home or a major extension, and for designers who want a quick framework. For naming existing styles, see What Architectural Style Is This?.
1. Start with the site and the program
House architecture begins with two lists.
The site: plot shape and size, slope, orientation of the street, setbacks, height limits, neighbours, existing trees, and access. These set the buildable envelope. A narrow plot suggests a tall, thin house; a wide plot a long, low one; a slope suggests a stepped section.
The program: how many bedrooms, how many floors the household will accept, whether a garage, home office or guest space is needed, and what must connect to what. Write it as a list of rooms with approximate areas. A brief that names rooms and relationships produces better designs than one that names a style. See How to Write an Architectural Brief.
2. Roof: the silhouette
The roof is the most visible shape of a house and the biggest single clue to its style.
| Roof | Effect on the house | Suits |
|---|---|---|
| Steep gable | Traditional, vertical, attic space | Cold or wet climates, farmhouse, cottage |
| Low-pitch gable with deep eaves | Calm, horizontal, sheltered porches | Mid-century, Craftsman, Scandinavian |
| Hip | Compact, symmetrical, classical | Georgian, traditional houses |
| Single slope (shed) | Directional, dynamic, strong façade plane | Contemporary houses, extensions |
| Flat | Simple volume, usable terrace or planted roof | Modern houses, urban plots |
| Butterfly or folded | Expressive, sculptural | Statement houses |
Roof decisions that matter: the overhang depth (deep eaves shelter the walls and add horizontal emphasis), the junctions between roofs (fewer is simpler and cheaper), and what sits on the roof (chimneys, solar panels, terraces). A roof plan drawn early prevents awkward intersections later; see Types of Architectural Drawings Explained.
3. Massing: the arrangement of volumes
Massing describes how the house is broken into volumes.
- Single volume. One compact box. Economical, energy-efficient and calm. Most reliable for small plots.
- Two volumes. For example a ground-floor base and an offset upper box. The offset creates a covered entrance, a terrace and an interesting silhouette from a simple move.
- L or U shape. Wings enclose a garden or courtyard and separate living and sleeping areas.
- Linear bar. A long, narrow house, often one storey, with every room facing the garden.
- Stepped. Volumes step down a slope. Each floor gets its own terrace.
- Main house plus annex. A secondary volume for garage, studio or guest room, linked by a canopy or a short corridor.
Massing moves worth testing: a cantilever over the entrance; a recessed porch that gives the front door depth; a courtyard cut into a large volume; a stepped terrace on the upper floor; a split level that follows the site.
Keep the number of different volumes low. Two or three clearly stated volumes read better than seven small ones.
4. Plan: where life happens
The plan is what you live in. The façade is what others see; the plan is what you use daily.
Principles that hold across house types:
- Zone the house. Group living, kitchen and dining in one zone; bedrooms and bathrooms in another; entrance and storage as a threshold.
- Place the stair early. The stair is the largest single element between floors and fixes bathrooms, structure and circulation. Align it with the floors above and below.
- Stack wet rooms. Bathrooms, kitchen and utility above each other simplify services and reduce cost.
- Give the entrance a sequence. A covered approach, a door, a hall, then the first view into the house. Entering directly into a living room is a choice, not a default.
- Connect inside and outside. Terraces, courtyards and gardens work when they have a direct door and a level threshold from the room beside them.
- Avoid long corridors. Corridors add area without adding use. Rooms that open onto a shared hall or living space are more efficient.
- Plan for change. A spare room that can be a study, a nursery or a bedroom keeps a house useful for decades.
Early plans are schematic. AI-generated plans are useful for exploring arrangements but are not dimensionally reliable or code-checked (AI Floor Plans: How Accurate Are They?). For a step-by-step method, see From Brief to Floor Plan with AI.
5. Openings: the façade rhythm
Windows and doors give a house its face. Three variables decide the impression.
- Size. Large panes make a house open and contemporary; small, deep openings make it solid and traditional.
- Alignment. Windows aligned above each other and evenly spaced read as orderly. Windows placed according to the rooms behind, with no alignment, read as informal.
- Rhythm. A regular repeat gives calm. A deliberate change (a wide opening at the living room, narrow ones at the bedrooms) tells you how the house is used.
Common openings: corner windows, ribbon windows, full-height glazing to a terrace, a single large “picture” window, high clerestory strips, and deep recessed reveals. Pick one dominant idea and repeat it, instead of mixing all.
Balconies and terraces are part of the openings system. They add depth and horizontal emphasis, and they link to the plan. Check that each one can be reached from a room that is used.
6. Cladding and materials
Materials set the character after form has set the shape.
- Brick, solid and traditional, ages well.
- Render or stucco, smooth and abstract, shows volumes cleanly.
- Timber cladding, warm and varied, suits farmhouse, Scandinavian and contemporary.
- Board-formed or smooth concrete, monolithic and heavy.
- Metal panels or standing seam, crisp, used on roofs and walls.
- Stone, durable, strong sense of place.
Use two or three materials. A common effective combination is one robust material for the base, a second for the upper volume and a third for details (door, soffit, window frames). Make the change of material coincide with a change of volume, not at random on a flat wall.
7. Putting it together: three example directions
A. Compact modern box. Single volume, flat roof, regular window grid, render with timber entrance. Efficient and simple; suits small and urban plots.
B. Long low house. Linear bar, shallow gable with deep eaves, ribbon windows toward the garden, brick and timber. Calm and horizontal; suits wide plots.
C. Stepped hillside house. Volumes stepping down the slope, each with a terrace, concrete base and timber upper floor, large glazing to the view. Responds to the site; costs more in foundations.
For each, test how roof, massing, plan, openings and material agree. If one dimension contradicts the others, adjust it.
8. A checklist before you commission drawings
- Is the buildable envelope clear, including slope and setbacks?
- Is the program a list of rooms with areas and relationships?
- Have you compared at least three massing options on the same plot?
- Does each option have a roof that works with its plan?
- Is the stair placed and aligned between floors?
- Do windows follow the plan and the façade rhythm?
- Are there no more than three main materials?
- Does the entrance have a sequence and a covered approach?
- Can each terrace and balcony be reached from a used room?
- Do you have a plan, a section through the stair and four elevations?
Exploring options with AI
The slow part of house design is comparing options: the same plot in a compact box, in an L, in a stepped form; the same volume with a flat roof, then a shallow gable. In Nuit you can describe a house in terms of roof, massing, openings and cladding, then branch from the image to change one decision and compare the results side by side (Branching as a Design Exploration Technique). See also AI House Design and AI Exterior Design from Text.
Treat the output as a concept. It is not an engineered design and does not check codes, structure or budget. Take the chosen direction to a licensed architect.
Related reading
- AI House Design: Build Your Home with AI — workflow from brief to concept
- 15 Architectural Styles: A Practical Guide — style vocabulary
- Mid-Century Modern Style Guide 2026 — one house tradition in depth
- How to Write an Architectural Brief — what to prepare before design starts
- From Brief to Floor Plan with AI — the plan step