ADU Design
A 646 sq ft, 1 bedroom single-story ADU
About The Lake Haven ADU
1
1
646 sq ft
The Lake Haven ADU is a 1 bedroom lakefront concept designed around a simple idea, make the view part of the home. At 12m × 5m (39ft 5in × 16ft 5in / 646 sq ft), the wider 5m footprint gives the floor plan room to breathe, with an open-plan kitchen, dining, and living area, a full bathroom with skylight, a view-connected bedroom, and a laundry nook behind a sliding barn door. Dark corrugated cladding, warm timber accents, and a long lake-facing deck give the exterior a clean, site-connected character. Inside, the palette is warm and grounded, walnut timber, dark cabinetry, marble-look stone, brass hardware, and large windows that frame the water at every turn.
Cabin Design Specifications
Layout
1 Bed
1 Bath
ADU (Accessory Dwelling Unit)
Sleeps
Sleeps 2
2 Adults
Plans/Blueprints Available
PDF ADU Plans
Available in metric & imperial
Plans Exported With:
Export with instant generate plans tool & Take off tool in 3D Designer
Images Generated With:
Images generated with AI Render Tool add-on for 3D Designer
Design Walkthrough
The Design Concept Overview
The Lake Haven ADU is built around a single design decision: put the lake at the centre of the floor plan.
Most ADU concepts focus on making a small footprint work harder, packing in bedrooms, bathrooms, and storage with as little waste as possible. The Lake Haven doesn't take that approach. The 5m width, which is wider than a typical narrow secondary dwelling, gives the open-plan living area enough room to feel genuinely comfortable rather than compressed. And instead of turning that extra space into more rooms, the design uses it to create sightlines. From cooking at the island to sitting at the dining table to relaxing in the lounge, the lake is always in view.
The exterior reinforces this connection from the outside in. Dark corrugated cladding wraps the building with a clean, contemporary profile that sits quietly against the water and tree line. A warm timber panel at the centre of the facade softens the look without interrupting the low, horizontal form. The long deck runs the full length of the lake-facing side, and the sliding doors and full-height glazing mean the boundary between inside and outside is easy to dissolve on a good day.
Inside, the palette is warm and considered. Dark cabinetry, walnut timber, brass hardware, marble-look stone, and cream upholstery create an interior that feels calm without feeling plain. It's not trying to be flashy — it's trying to be a home you'd actually want to spend time in. The design suits a compact lakefront retreat, a permanent backyard home, or a secondary dwelling where the setting is part of what makes the place worth living in.
Exterior Design
The Lake Haven ADU has a long, low rectangular form with a gently sloping mono-pitch roof, a clean silhouette that keeps the building from competing with its surroundings.
The primary cladding is dark corrugated vertical metal in a deep denim-blue tone that sits closer to dark charcoal in certain light conditions. It covers the main body of the building and gives the exterior a contemporary, durable character. Against the water and autumn foliage in the renders, the dark cladding reads as quiet and site-responsive rather than stark.
A vertical panel of warm natural timber runs through the centre of the lake-facing facade, flanking the main entry zone. The contrast between the two materials, dark metal and light wood, gives the building definition without requiring ornamental detail.
The glazing and entry are deliberately composed:
Multiple large sliding glass doors facing the lake, with dark aluminium frames
Fixed picture windows flanking the sliders on each zone
A rooftop skylight serving the bathroom directly below
Dark frame joinery throughout, tying back to the cladding tone
A long natural timber deck running the full length of the lake-facing facade
The deck is wide enough to function as a genuine outdoor living extension rather than just a threshold. It connects directly to the kitchen and dining sliders at one end and the bedroom slider at the other. It's not just circulation, it's usable space.
Kitchen & Dining
The kitchen is the functional anchor of the Lake Haven ADU, and the 5m footprint makes room for it to be a proper one.
The layout pairs a full benchtop run against the back wall with a large island running lengthwise in front of it. The island has seating for four to five on bar stools along the dining side, making it the natural hub of the open-plan space, somewhere to sit with coffee while someone is cooking, or to eat casually without pulling out the full dining table.
The cabinetry uses two finishes that work well together:
Lower cabinetry: Dark charcoal-grey matte flat-front panels with brass bar pulls
Upper cabinetry: Warm walnut timber, flat-front, with integrated or recessed pulls
Benchtop: Light marble-look stone with soft grey veining, on both island and main run
Splashback: Continuous stone surface behind the cooktop, consistent with the benchtop
Tapware: Brass gooseneck fitting above the sink, matching the hardware throughout
The lower run feels grounded and robust, while the timber uppers carry the warmth of the interior palette. It's a kitchen that looks considered without feeling overdressed. And because it's positioned at the heart of the open plan, it doesn't feel like a service zone tucked out of the way — it's part of the living space.
The dining zone sits directly adjacent to the kitchen island and faces a large sliding door with a lake view. The natural timber dining table, paired with matching chairs and a bench, keeps the palette cohesive with the kitchen cabinetry above. A brass drum pendant overhead ties back to the hardware throughout the home.
Living Room
The living area flows directly from the dining zone, separated only by the shift in furniture rather than any physical partition.
A large cream sectional sofa anchors the space, facing a pair of lake-view windows and a wall-mounted television. A round walnut coffee table sits on a natural jute rug in front of the sofa, and a full-height walnut bookcase fills the wall behind, open grid shelving styled with books, ceramics, and plants. The effect is warm and well-used rather than spare.
The living area benefits from some of the best natural light in the home. Corner windows and a full-height fixed glazing panel bring in lake views from two angles, and the deck slider means the lounge can spill outside when the weather allows. It's a flexible space that works as well on a bright autumn afternoon as it does on a quiet winter evening.
The wider footprint is most noticeable here. The kitchen, dining, and living zones each have enough room to feel like distinct areas within the same open plan, rather than one long narrow space where everything is compressed into a single line. This matters for everyday comfort in a 1 bedroom ADU floor plan, the home feels generous at 646 sq ft in a way that narrower layouts at the same square footage often do not.
Interior | Bathroom
The bathroom is the most elevated space in the Lake Haven ADU, with a quality of finishes and a skylight detail that gives it a noticeably spa-like character.
The shower is a large walk-in enclosure with a full glass screen using brass hardware. Large-format grey marble-look stone tiles cover all four shower walls, and a brass rainfall showerhead paired with a handheld fitting sits against the tiled wall. A wooden stool inside the shower adds a practical, considered touch.
The skylight above is the defining feature of the room. It sits directly over the shower and vanity area, flooding both with natural daylight and making a space that could easily feel enclosed instead feel calm and open. It's a detail that's visible on the rooftop in the aerial exterior renders and confirmed in the bathroom shots below.
The vanity brings the same material warmth as the rest of the home:
Floating walnut timber unit
Wide marble-look stone benchtop
Double undermount sinks
Brass wall-mounted taps (two sets)
Large timber-framed mirror
Open shelving below for towels and storage
Warm timber flooring continuous with the rest of the home
It's a bathroom that doesn't feel like an afterthought. The combination of skylight, stone tiles, brass, and timber makes it a genuinely comfortable space for everyday use.
Bedroom
The bedroom is a calm, view-connected space that does its job without overcomplicating the floor plan. It's one of the rooms where the 5m width pays off most directly.
The headboard wall is clad in vertical timber slats, warm walnut tones that carry through from the kitchen cabinetry and vanity. A low clearstory window above the bed lets natural light fall across the headboard from behind without compromising privacy. Two white floating nightstands with lamp pairs sit on either side of the bed, and a bench at the foot of the bed rounds out the furniture.
The large sliding glass door to the lake is the bedroom's standout feature. It opens directly onto the deck and frames an uninterrupted water view from the bed. For a 1 bedroom ADU plan, this kind of direct indoor-outdoor connection makes the room feel significantly more spacious than its footprint suggests.
Storage is well-handled for a 1 bedroom ADU floor plan:
Full-height built-in wardrobe in warm walnut timber
Small dressing nook with wall-mounted round mirror
Simple timber dressing table and stool
Enough practical storage for permanent, day-to-day living
The design keeps the bedroom focused and uncluttered. There's no wasted space, but it doesn't feel stripped back either.
Laundry
The laundry is tucked off the dining area behind a full-height sliding barn door in natural timber with a brass rail track.
Inside, a stacked front-loading washer and dryer sit below open timber shelving for laundry supplies and storage. Dark lower cabinetry continues the kitchen palette, and brass shelf hardware connects the two spaces. When the barn door is closed, the laundry disappears into the wall of the dining area without leaving a visual trace.
For a 1 bedroom ADU design at 646 sq ft, a dedicated laundry matters. It gives the home full residential function, a proper separate space for laundry rather than folding it into the bathroom, while the sliding door keeps it practical without requiring a separate room.
The Lake Haven ADU in Summary
The Lake Haven ADU is a 1 bedroom floor plan concept that earns its livability through a wider footprint, a view-first layout, and an interior palette that keeps every room feeling warm and considered. From the kitchen island to the bedroom slider to the skylit bathroom, the design treats the lake as a feature rather than a backdrop.
If you're a builder looking to add a design like the Lake Haven ADU to your model range, book a demo with the Tiny Easy team to see how you can design, visualise, and present ADU concepts like this to your clients.
How We Designed this Cabin Concept
Every part of this cabin plan concept, from the exterior details to the interior layout, was designed entirely within the Tiny Easy platform. No third-party tools, no hand-drawn floor plans, no outsourced renderings. From the first concept through to final handoff documents, the whole process lived in one place.
Design Creation
For builders, one of the biggest bottlenecks in turning interest into a real sales conversation is the time it takes to get a clear design in front of a client. Traditional 3D design tools can be slow to learn, and relying on a designer or draftsperson for every early concept can add cost and delay before the client has even had a chance to properly understand the home.
The 3D Designer is Tiny Easy’s design workspace for creating, managing, and tailoring tiny homes, cabins, granny flats, ADUs, and more within one connected system. Builders can use it to build out their core model range, save designs as reusable templates, test new ideas, explore layout options, and refine their designs over time.
Inside the Designer, the structure can be shaped using tools like Foundation, Shell, and Roof, before completing the model with doors, windows, walls, interior doors, cabinetry, furniture, fixtures, lighting, and finishes. This gives builders a practical way to create complete 3D concepts without needing to start from scratch or rely on complex modelling workflows.
Where this becomes especially valuable is in the sales process. Instead of designing a new cabin from a blank canvas for every enquiry, builders can pull the most relevant model from their existing range into a client project, tailor the layout, finishes, openings, and key details, then present a concept that feels specific to that client.
That speed changes the quality of the conversation. Clients are not left trying to imagine the home from 2D plans, rough sketches, or verbal explanations. They can see the design clearly, understand the layout, explore the options, and build confidence in the direction before moving further into pricing, proposal, or approval.
For builders, the result is a faster and more professional path from enquiry to client-ready cabin concept. The 3D Designer helps turn design into a sales tool, giving builders a repeatable way to respond quickly, communicate clearly, and move serious clients forward while interest is still warm.
Visualization
Once a design is complete, the next challenge is presenting it in a way that actually converts interest into commitment. Traditionally, that meant outsourcing renders to a freelancer — which adds cost, turnaround time, and rounds of back-and-forth — or investing in professional rendering software that requires its own lengthy setup before a single image is produced. For a small home builder running a lean operation, neither is a sustainable way to work.
The AI Render Tool takes care of that. Once the design is finalised in the 3D Designer, renders are generated directly from within it. The only setup required is positioning the camera, choosing an environment, setting the time of day and season, and hitting render. The result is a photorealistic image of the home, produced in minutes rather than days — and at a fraction of the cost of conventional methods.
The 3D Viewer Tool adds another layer to the client experience, letting them explore the completed design in interactive 3D from any device. Sharing it is as simple as sending a link. Scale and spatial flow can be difficult to communicate on paper — paired with AI Renders, a 3D virtual tour gives clients the confidence to take the next step without hesitation.
Presentation
Once a design is ready, the next challenge is turning all the project information into a proposal that feels clear, professional, and easy for the client to understand. For many builders, this is one of the most tedious parts of the sales process. The design may already be done, the renders may be ready, and the pricing may be prepared, but pulling everything together into a polished client proposal often means jumping between Canva, PowerPoint, PDF exports, spreadsheets, and old proposal templates that are either too rigid or too difficult to edit.
The Proposal Builder is Tiny Easy’s proposal creation tool for building professional, branded client proposals within one platform. It helps builders bring together the key parts of a project, including 3D Viewers, PDF plans, AI Renders, specifications, pricing, inclusions, available options, and next steps, into one clear presentation.
Instead of starting from a blank document every time, builders can begin with suggested proposal templates designed around the way small home projects are actually sold. These templates provide a practical page structure for presenting a customised design, with sections for introducing the project, showcasing the design, explaining the layout, outlining specifications, presenting pricing, and guiding the client toward the next step.
This gives builders a faster way to insert the right content in the right order without needing to design a full proposal from scratch. Pages can be adjusted, removed, duplicated, or added as needed, so the proposal can still be tailored to the client without becoming a complicated custom design task.
The value is not just that the proposal looks better. It helps the client understand the project faster. Instead of receiving disconnected files, flat plans, separate renders, and a pricing document, they get one polished proposal that brings the design story together. They can see the home, understand the layout, review the key details, and know exactly what happens next.
For builders, this creates a more repeatable and professional sales workflow. It reduces the time spent assembling proposals manually, keeps presentations more consistent across the team, and helps move clients toward sign-off, approval, or deposit with greater confidence.
Handoff
When the design is approved and it's time to move into documentation, the 3D Designer exports everything needed to take the project forward. PDF plans are generated directly from the model — accurate, professional documents that give a draftsperson or architect a clear picture of the design intent without any redrawing required.
Alongside the plans, an auto-populated material take-off spreadsheet exports directly from the design. Rather than manually costing a new model from scratch, the material list is already populated and ready to work from — saving hours in the estimation process and reducing the margin for error when putting a quote together.
For those who need to take the model further, the 3D Designer also exports a SketchUp file, allowing the design to be carried into more advanced workflows without having to rebuild from scratch.
For builders, this closes the loop on the entire process — from first sketch to professional handoff — without the design ever leaving the platform. It's a faster, cleaner way to work that reduces errors, saves cost, and keeps the project moving.
Ready to Design your Own?
This cabin design is proof that a small footprint doesn't mean compromising on quality — in the design, the experience, or the process behind it.
What made it possible wasn't a team of designers or an expensive production pipeline. It was a single platform, built specifically for the way small home builders actually work.
If you're a builder who wants to walk into your next client meeting with renders like these, proposals that are ready to go, and a process that runs end to end without the usual friction — book a call with us and let's talk about what you're building.
