ADU Floor Plan for 1000 sq ft House

Plan for 1000 sq ft House and enjoy the benefits of a second home on your property

If you are working on a plan for 1000 sq ft house, you have a lot of decisions to make.  Floor plans for 1000 sq ft houses come in many layouts. Most prefabs will be rectangular or square, I shaped or L shaped and at least 12-14 feet wide. You can often maximize your backyard potential with a custom shape.

What ADU floor plan will make the most of your backyard?

Hint: the ones that fit your backyard like a lost piece of a puzzle.

Case study: 2 bedroom ADU Floor Plan for 1000s q ft house

One of our ADU plans: 1000 sq ft with 1 bathroom


A family is moving an aging parent closer to home, and try to accommodate a guest suite for a wheelchair bound relative. Lot size allows to plan for 1000 sq ft house.

  • Wheelchair access
  • Vaulted ceilings in the living room
  • Deck facing the creek with a see through fireplace
  • Matching the look and style of main house


The location of this ADU was restricted from all 4 sides sides:

1. Property line 2. Main house 3. Creek  4. Public Utility Easement 


In addition to all that, it was in WUI zone and had to be built fire resistant. In this project, we had only one lucky break: there were two hydrants on both sides of the property within the required 400 ft distance.

2 bedroom ADU plan for 1000 sq ft house
Currently in construction


A bigger bathroom accommodates the necessary area for a wheelchair turnaround, has both a shower and a tub, plus houses the laundry. 

The living room has vaulted ceilings (though the general contractor in charge may blacklist us for this design feature). The fireplace is surrounded by two windows, with the nearby exit to the deck  facing the creek

The initial design had walk in closets in both bedrooms. However the homeowners decided to have a bigger one in the primary bedroom and have the smaller size guest room.

2 bedroom 1000 sq ft floor plan

The best ADU Floor Plan addresses family needs and fits the backyard like a glove. Your new ADU should look like it has always been there, not as a foreign object. It should also maximize the space – take as much of your backyard as you are willing to dedicate to the new living area.

What plan for a 1000 sq ft house will make the most of your backyard? 

We have 50+ floor plans that can easily become a plan for a 1000 sq ft house. 

Options for 1000 sq ft House Floor Plans

963 sq ft 2b1b ADU floor plan

ADU floor plan 970 sq ft

This two bedroom one bathroom ADU design makes efficient use of space with more emphasis on common living area, spacious primary bedroom and a smaller secondary bedroom (that could also be used as a guest room or home office).

1004 sq ft 2b1b ADU floor plan with 1 car garage

This two bedroom one bathroom ADU design has a comfortable living area, two small bedrooms, laundry space and the bathroom with the shower/tub combo. Plus, it has a garage.

963 sq ft 2b1b ADU floor plan

ADU floor plan 980 sq ft

This two bedroom two bathroom ADU has a primary en suite bathroom and an additional bathroom with access from the living area.

996 sq ft 2b2b ADU floor plan

ADU floor plan 1000 sq ft

This detached two bedroom two bathroom ADU has a primary en suite bathroom and an additional bathroom with access from the living area and a spacious laundry area. L-shaped kitchen, living and dining are an open space design.

1000 sq ft ADU Floor Plan

This two bedroom two bathroom ADU has a primary en suite bathroom and an additional bathroom with access from the living area. The kitchen has an option to be a separate room.

1200 sq ft ADU Floor Plan

This two bedroom two bathroom ADU has a primary en suite bathroom and an additional bathroom with access from the living area. Both bedroom have walk in closets, and there is an additional flex room that could be used as an office. Can easily be used as a main home for a small lot!

Whichever ADU floor plan you select, you will not pass a final inspection without these features

Essentials for any of our plans for 1000 sq ft house


Type of insulation is called out in your Title 24 report provided by your energy consultant or HERS rater.

Kitchen Appliances

All ADU floor plans should show sink, cooktop, hood and fridge. These items are essential for anyone living permanently in the ADU.

Fire and CO2 Alarm

Smoke and carbon monoxide alarms are required on the wall or ceiling outside of each sleeping area. 

HVAC and Ventilation

Ductless mini splits are an accepted way to heat and cool your ADU. Energy Recovery Ventilators are an energy-efficient way to maintain indoor air quality.

Water Heater (Heat Pump)

As California goes all electric, think about the sizing of your pump – it depends on the number of people living in the ADU.

Address Numbers

ADUs are often required to have two sets of a minimum of 4 inch high house numbers – with one on ADU and an extra that is seen from the public road. Ideally they should be hardwired and illuminated.

Let us do it right first time around!

Disruptive Changes Typically Required in Standard Housing for Aging in Place

Add first floor bathroom, bedroom, laundry25%
Widen doorways and hallways49%
Add ramp or lift for easier entry45%
Adjust cabinet and countertop heights41%
Upgrade shower to no-curb (roll-in)39%
Modify faucets42%
Add hand-held showers40%
1000 sq ft house sounds like a challenge?

We make it easy to get started


Create property site plan

Let us answer three questions together: 1. How big can you build? 2. How much of a backyard can you dedicate to new living space? 3. How much can you afford to spend on construction.


Select the best ADU floor plan

We do not like to invent wheels or bicycles. Let us get started with the plan for 1000 sq ft house that fits most of your requirements and then tweak it to make it shine in your backyard.


Assign the team

The success of a construction project hinges on how well the team communicates. You have a contractor you like? Bring her on board. We are happy to support you with the design, engineering and construction – when needed.


Gather Necessary Documents

Let us start with the best information available. What do you already have? Title report. Floor plan or site plan of your main house. Survey. Soil report. All these documents are a great foundation for your future successful construction project. Pun intended.


Compile the permit plan set

The number of pages in your plan set can differ from 8 to 140 (no kidding). It all depends on property specifics and city (or county) requirements. The better prepared your first submission is, the faster you get your permits. 


Respond to Plan Checker comments

Do you know that the most frequent reason it takes such a long time to pull permits is the number of weeks that passed between the day the city had given plan check comments and the day your team responded to them?

Three pillars of a well designed plan for 1000 sq ft house

What you need to consider for your 1000 sq ft house?


From traditional slab and pier options to hybrid foundations that use helical screw piles – the final choice needs to be evaluated on the basis of backyard access, feasibility, budget and house designs.


California is going all electric. This means your water heater will be electric. So will your HVAC heat pump and cooktop. You will be required to put some solar panels on the roof as well. All this needs a 200A + electric panel. 

Natural Light

We love indoor-outdoor seamless flow and having lots of natural light. It often comes at the expense of energy efficiency. You can compensate for it with better quality windows with a lower U factor. Include in your plan for 1000 sq ft house.