When you’re designing your own custom home, you are in the best position to make it energy efficient. Many of the most critical design choices for energy efficient are the hardest to achieve with renovation as they require overhauling the whole home design or changing major elements. While you’re in the design phase, it’s important to have conversations with your designer and builder about how important it is for you to have an energy-efficient home and what kind of designs might help you achieve that. Here is a quick guide to the kind of designs you should discuss.
1. Explore Types and Designs
There are many types of energy-efficient home designs. Some homes look entirely typical but are packed with energy-efficient features. Others look like they have radically different designs to maximize energy usage—because they do. One notable option is a passive home. These are designed to not require electricity, at least to heat or cool itself. When you’re looking through passive home ideas, remember the design needs to work for your climate. Here in California, passive homes need to minimize heat from the sun through most of the year and use low or no-energy options to cool the space. There are many creative designs which achieve this.
2. Building Envelope
The building envelope is the outer shell of the home, the parts that separate it from the external environment. It includes some of the most important elements for energy efficiency, including the insulation, roof, and foundation. In our climate, designers of energy-efficient homes often want to include geothermal cooling, which is best with specific foundation designs. Typically, they also want to include excellent insulation. You can choose more sustainable and unusual insulation options or use the products that dominate the market.
3. Orientation in the Lot and Layout
The overall orientation of the home on your lot can take advantage of natural features to reduce the energy needs of the home. Taking advantage of natural shade from trees or other sources can be especially beneficial in our climate. Other elements of the lot, like slope, also matter.
Then consider the layout of the home in relation to the lot, the sun, and other factors that might impact its energy efficiency. A truly skilled designer will learn about your lifestyle and habits to create a layout that maximizes your comfort in your home while reducing its energy need. That might include designing your bedroom so it will be most comfortable when you sleep, placing your home office to have the best light during your work hours, and more.
4. Consider Home Size
Larger homes are less efficient. Ideally, you’d choose a home that is just as large as you need it to be. This doesn’t mean your home should feel cramped or that every single space needs to be dual-purpose. Instead, a home of the correct size should still feel spacious while not adding unnecessary energy burden.
What Are The Biggest Energy Mistakes You Can Make in Home Design?
Some of the biggest energy wasters in home design often stem from poor planning, outdated materials, and inefficient systems. Here are the most common culprits:
1. Poor Insulation
- Problem: Inadequate insulation in walls, attics, and floors allows conditioned air to escape.
- Impact: Increased heating and cooling demands year-round.
- Fix: Use modern materials like spray foam, rigid foam board, or blown-in cellulose for better thermal resistance.
2. Single-Pane or Inefficient Windows
- Problem: Heat easily passes through outdated or low-quality windows.
- Impact: High energy bills, uncomfortable interior temps.
- Fix: Upgrade to double- or triple-pane low-E windows.
3. Air Leaks
- Problem: Gaps around windows, doors, ductwork, or electrical outlets.
- Impact: Significant loss of conditioned air.
- Fix: Air sealing with caulk, spray foam, and weatherstripping.
4. HVAC System Placement
- Problem: Installing HVAC equipment in unconditioned spaces like attics or garages.
- Impact: The system works harder to cool or heat air in extreme temperatures.
- Fix: Locate equipment in insulated, conditioned areas whenever possible.
5. Oversized HVAC Systems
- Problem: An oversized system cycles on and off frequently.
- Impact: Wastes energy and creates uneven indoor temps.
- Fix: Use a Manual J load calculation to size the system correctly.
6. Inefficient Lighting Design
- Problem: Overuse of incandescent or halogen bulbs, poor natural lighting layout.
- Impact: High electricity use.
- Fix: Switch to LEDs, use daylighting strategies like skylights and light shelves.
7. Poor Passive Solar Design
- Problem: Ignoring sun orientation, window placement, or shading.
- Impact: Missed opportunity for free heat and light, overheating in summer.
- Fix: Design with sun paths in mind, use thermal mass and shading devices effectively.
8. Outdated Appliances and Fixtures
- Problem: Older appliances and water heaters consume more energy.
- Impact: Higher utility bills.
- Fix: Upgrade to ENERGY STAR appliances and low-flow water fixtures.
9. Uninsulated or Poorly Sealed Ductwork
- Problem: Leaky ducts can lose up to 30% of conditioned air.
- Impact: Reduced efficiency and uneven temps.
- Fix: Seal and insulate ducts properly, ideally within conditioned spaces.
10. No Smart Controls or Zoning
- Problem: Thermostats that don’t adapt to your habits waste energy.
- Impact: Unnecessary heating/cooling.
- Fix: Install programmable thermostats, zoning systems, and smart home integration.
Honorable Mentions
- Large, unshaded west-facing windows → leads to overheating.
- Over-reliance on recessed lighting → creates ceiling penetrations that leak air.
- Poor roof color choice in hot climates → darker colors absorb more heat.
A talented designer can help you make the right decisions to build an energy-efficient home while also balancing this with your other priorities.
Our pros can handle 100% of the process of designing and building a custom home. Get in touch with us today!
