The studio that designs your house builds it.
When one firm draws and builds, from a kitchen to the whole house, the drawings are what hold us: detailed enough to build from and be held to, with a price set against them before demolition starts.
We opened in June 2019 and work from Markham, Ontario. We hold a builder licence from the Home Construction Regulatory Authority.
Nathalia signs the drawings and Thiago is answerable for what gets built against them. Where the site and the drawings disagree, the change is priced and signed before anyone builds to it.
What each lane covers
We draw the interiors and the construction set. Every material is chosen before a wall moves. Layouts, elevations, 3D, material boards, and a construction set complete enough that the trades are not guessing.
We are the licensed builder. We run the site from demolition through handover, on the drawings we made. We pull and hold the permits and schedule inspections around the trades.
We cut cabinetry for the room it goes in. Rift oak, fluted bases, unlacquered brass. Nothing is cut before you approve the shop drawings.
We source the furniture and decor, or we make it. From makers we know, or drawn and built alongside the millwork when nothing off the shelf fits.
One agreement covers whichever of the four your project needs, and one number reaches the person answerable for it.
From first call to handover
Twelve steps in three phases. Design and pricing come first, construction last.
Concept
- Discovery callYou tell us the house and roughly when. We come back with a scope and a design estimate before anyone visits.
- Measure and walk throughWe measure on site and talk through how you use the rooms now.
- The conceptWe start with layout diagrams and mood boards: the shape of the thing, before any of it is expensive to change.
- FeasibilityWhat the house will allow against what the budget will allow, and where the two disagree. We say so here rather than later.
Development
- Final design and 3DYou walk through every room in 3D and approve the layout before anything is ordered.
- Materials and finishesEvery selection made and written down by species, grade, finish and supplier, so it can be ordered.
- Sample boardsThe real materials in your hand, under the light of your own rooms.
- Construction drawingsWe prepare the full set to permit standard. If the house needs a minor variance we tell you at feasibility, because the Committee of Adjustment sets that date and nobody here can move it.
Build
- Demolition and constructionOur own crew, building from the drawings Nathalia signed. Thiago runs the site.
- Assessment as we goWhatever a wall turns out to hold is priced and agreed in writing before the work happens.
- Sourcing and procurementWe order, track and receive it. Long lead items are placed early, because they set your finish date.
- Walkthrough and handoverWe walk it with you and write down everything that is not right. Each item gets a date, and the list stays open until the last one is closed.
After a flood or a fire
The claim is filed before the build, and what the insurer approves sets what it pays for.
We do not bill your insurer and we do not act for them. What we do is help you document it: what to photograph before anything is moved, and how to describe the damage so the claim covers everything the water or smoke reached rather than only what shows. Then we quote the rebuild, and we build it.
The people doing the work
We are a small studio in Markham, where the designer is married to the builder.
Nathalia Hara, BID
Bachelor of Interior Design, Yorkville University. NKBA Ontario named her Best New Designer in 2025. She took the degree online from 2021 while working full time and graduated in December 2024.
Her rooms lean on segmental arches, white oak and natural stone, and she tells you before you buy how each will age.
She lives in Markham with Thiago and their daughters, Hana and Helena.
Thiago Hara
Fifteen years running manufacturing operations before this, at one point across teams of more than a hundred and twenty people.
He runs every site we build. Featured in the Toronto Sun as principal of One Group, and on the Marc & Mandy Show on waterproofing and bathroom renovation.
Érika Ferreira
Érika joined One Group in 2026 and works remotely from Brazil. She holds a Bachelor of Architecture and Urbanism, and she prepares the drawings and the construction documents for every project.
Begin a project.
Tell us about your home, what you are thinking of changing, and roughly when you would like to begin. Whether it is a focused renovation, a larger transformation, an addition, a custom home, or only the beginning of an idea, we will tell you from the start if we are the right team for it.
Start a conversation