Design the site before the house. Orientation, sun path, views and slope decide more about how a home feels than any floor plan does, and they are the only inputs you cannot change later. Then build a must-have list, develop a concept, and lock in thermal performance while the design is still flexible — because insulation and glazing decisions made at concept stage cost a fraction of what they cost as a retrofit.
Two different questions get asked with the same words
Before anything else, sort out which one you are asking.
Designing a house from scratch starts with a piece of land and ends with construction drawings. The lot drives the design, and most home design decisions follow from it.
Redesigning a home you already own starts with an existing structure and works within it. The building drives the design.
This page covers the first. If you are working with an existing house, the process is different enough that it deserves its own treatment — our guide to designing a home renovation covers the five-phase professional process and the floor-plan freeze that decides your budget.
One more thing worth knowing about this search: two of the top results are floor plan software rather than articles. If what you actually want is a tool to draw a layout, that is a different need and those tools do it well. This page is about the decisions you make before you open one.
How to design a home around the site you have
The lot is the one constraint you cannot design around. Everything else is negotiable.
Sun path. Work out where the sun rises and sets across the seasons on your specific lot. In the northern hemisphere, south-facing glazing collects winter sun and can be shaded in summer; north-facing rooms get consistent, indirect light. Getting this wrong produces a house that is dark in winter and overheats in summer, and no amount of later work fixes it properly.
Views. Position the rooms you spend the most time in to face what you actually want to look at. If the lot has a view, the kitchen and living room should have it, not the guest bedroom.
Slope and drainage. Where water goes on the site determines foundation design and where you can build at all. This is an early survey question, not a later discovery.
Access and street presence. Where the driveway lands, where the front door faces, and what a visitor sees on approach.
Neighbors and privacy. Which windows overlook what. Easier to solve on paper than with curtains for thirty years.
Sit with the lot at different times of day before finalizing anything. An hour on site in the morning and again in the evening tells you things a survey drawing does not, and it is the cheapest step in how to design a home well.
Build the brief before the drawing
Designers work from a brief. A vague brief produces revisions; a specific one produces a design.
Start with must-have rooms. Number of bedrooms and bathrooms, and any non-negotiables — a separate laundry, a walk-in closet, a dedicated office. Include what you will need in ten years, not just now. A growing family and a shift to working from home are the two changes that most commonly break a five-year-old floor plan.
Then a separate nice-to-have list. Media room, spare bedroom, second living space. These get added if the budget allows and removed if it does not, and separating them upfront prevents the painful version of that conversation later.
Set the budget before the design, not after. Budget shapes size, finishes, and which professionals you can afford. A design produced without a number attached is a design you will pay to redo.
Write down what frustrates you about where you live now. This is the most useful input a designer can receive and the one most people skip. Specific complaints — the entrance has nowhere to put shoes, the kitchen has no daylight after 2pm — produce better outcomes than a folder of images.
The concept design stage, and what should be in it
Your designer develops the brief into one or more concepts. A concept at this stage should show:
- Preliminary room arrangements
- Construction systems
- Window opening sizes and orientation
- Indoor–outdoor flow
- Furniture layouts
Ask for scaled furniture cut-outs. Have the designer produce drawings of the furniture you actually intend to use, scaled to the plan, that you can print and cut out. Then move them around on the concept plans yourself.
This sounds trivial. It is the cheapest way to discover that the sofa you own does not fit the living room you are about to build, or that the dining table blocks the route to the back door.
Note on cost: each additional concept your designer develops increases design fees. Two concepts is usually worth it. Five is usually indecision being billed by the hour.
Lock in thermal performance now, not later
This is the single highest-value thing to get right at concept stage, and the reason is timing rather than importance.
Thermal performance is how well the building controls heat transfer, holds a comfortable temperature and reduces the need for heating and cooling. Decisions that determine it — orientation, glazing size and position, insulation strategy, thermal mass, shading — are cheap to change while the design is still flexible and expensive to change afterwards.
Bringing in a building sustainability consultant or energy assessor at concept stage is worth the fee. Every opportunity for high thermal performance can be locked in while it costs nothing but a drawing revision.
The payoff runs for the life of the building: better comfort across the seasons and lower energy bills every year.
Retrofitting the same performance later is both more expensive and less effective, because the fundamentals — which way the house faces, where the glass is — are already built.
Set energy priorities while the design is flexible using our green home improvement guide. Keep a separate all-in budget using our custom home design and construction cost breakdown, which includes the costs beyond the building itself.
Two conversations to have during concept, not after
Both of these prevent the expensive version of finding out.
Talk to the planning authority. Designers commonly discuss the proposal with council planners and inspectors at concept stage to identify issues needing resolution. Discovering a setback rule or height restriction after construction drawings are complete means paying to redraw them.
Talk to two possible builders. Have preliminary conversations to check whether the design can actually be built within your budget. This is the same principle that governs renovation work: the first real cost number should arrive while the design is still cheap to change, not after it is finalized.
Test the design before you commit
Once you have a concept, do two things before approving it.
Visualize your household living in it. Walk through a normal weekday in your head. Where do wet coats go? Where does the shopping land? Where is the noise when someone is on a call and someone else is cooking?
Revisit your list of current frustrations. Have the problems you wrote down been solved? And — the question people forget — have new ones been created? A design that fixes the dark kitchen by moving it can easily create a new problem with the entrance.
Concept stage is the last point where the answer to both questions is a drawing revision rather than a construction change order.
Materials and finishes, chosen for how you live
Finishes come later in the process, but two principles are worth setting early.
Match durability to household. Young children, pets and high traffic mean flooring and finishes chosen for cleaning rather than photographs. This is a lifestyle decision more than an aesthetic one.
Put personality where it is cheap to change. Paint, light fixtures, hardware and window treatments are easy and inexpensive to swap. Layout, flooring, cabinetry and tile are not. Keeping the permanent decisions closer to broad appeal and the changeable ones personal gives you a house you like now and one you can update later without a renovation.
How to design a home: the order, summarized
- Survey and understand the lot — orientation, sun path, views, slope, access
- Write the brief — must-haves, nice-to-haves, budget, current frustrations
- Develop concepts with room arrangements, window positions, indoor–outdoor flow
- Bring in energy and sustainability input while the design is flexible
- Check with planners and two builders before the concept is approved
- Test the concept against a normal day and against your original complaints
- Proceed to detailed design and construction documents
Steps 4 and 5 are the two most commonly skipped, and they are the two that cause the most expensive corrections.
See our guide to designing a home renovation if you are working with an existing house, and our breakdown of home improvement loan types if you are financing the build.
FAQ
Where do I start when designing a house?
With the lot, not the floor plan. Orientation, sun path, views, slope and access are the constraints you cannot change later, and they shape everything about how the finished house feels. Write your brief second, and start drawing third.
What should be in a design brief for a new home?
Must-have rooms and features, a separate nice-to-have list, a realistic budget, and a written list of what frustrates you about where you currently live. Include your needs ten years out, since growing families and home working are the two changes that most often outgrow a new floor plan.
When should I think about energy efficiency in a house design?
At concept stage, while the design is still flexible. Orientation, glazing size and position, insulation and shading determine thermal performance, and all of them are cheap to change on a drawing and expensive to change once built. An energy assessor at this stage usually pays for itself.
Do I need an architect to design a house?
For a new build, yes or an equivalent qualified designer, because the drawings have to satisfy structural requirements and the permit process. Floor plan software is useful for exploring ideas and communicating them, but it does not replace the documentation a build requires.
How many design concepts should I ask for?
One or two. Each additional concept a designer develops adds to the design fee, so more options come at a direct cost. If you cannot choose between two well-developed concepts, the issue is usually an unresolved question in the brief rather than a shortage of options.
How is designing a new home different from redesigning an existing one?
A new build starts with a lot and the site drives the design. A renovation starts with a structure that constrains what is possible, so the process begins with measuring what exists and works within it. The professional phases are similar; the starting constraints are completely different.
