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we design architecture
we design architecture

Discipline

Architect for residential development: multi-family housing, quarters and subsidised housing

Sector

Multi-family housing, quarters, rental housing

Services

Feasibility, design, site supervision

For project developers, property developers and housing companies

Where floor-area efficiency meets quality of living

We design residential buildings that add up: maximum lettable floor area from your site, marketable floor plans and cost forecasts accurate to within around five per cent.

Milchhof Carré Ansbach – residential quarter with 209 apartments

“A housing project's return is generated during preliminary planning. Whoever has floor area and costs under control at that stage gains nothing further on site – and loses nothing either.”

Mathis Malchow, Founder of OOW

Historic brick building of the Alte Post Neukölln on the street corner

Residential construction is a calculation exercise with a design ambition. For project developers, property developers, housing companies and investors, we design multi-family housing, rental housing and entire quarters – from income-based subsidised housing to upmarket owner-occupied apartments.

Our largest residential quarter, Milchhof Carré in Ansbach, comprises six buildings with 209 apartments: 104 income-based subsidised rental apartments for BayernHeim and around 105 student apartments, built to KfW-55 standard with its own landscaping and open-space concept.

Maximum floor area, maximum lettability

Floor-area yield determines viability: we make full use of the permissible floor area ratio, optimise the ratio of living space to gross floor area, and keep the share of circulation space small. Just as important is the housing mix – layouts, daylighting and sizes that suit the location and the target rent. In the rental housing scheme Wohnen am Leopoldplatz in Wedding, a former commercial site became a green-framed residential oasis.

Cost forecasts accurate to within five per cent

We determine your costs not from gut feeling, but from our own cost database. Our self-developed cost-rate system calculates roof, façade and shell construction as well as fit-out and building services trades using our own benchmark figures. On the basis of a planning-law feasibility study, this allows us to reach cost forecasts accurate to within around five per cent – long before the first tender goes out. During construction, cost calculation to DIN 276, ongoing controlling and consistent management of variations secure the result.

Planning permission, funding, timelines

The biggest risk in residential construction is lost time. We clarify early on whether your project is permissible under a development plan (Bebauungsplan) or under § 34 BauGB, check boundary setbacks and exemptions, and keep an eye on new instruments such as the Bau-Turbo fast-track provision under § 246e BauGB. We design in compliance with the GEG (Buildings Energy Act), specify projects to Effizienzhaus 40 with QNG certification where required so that KfW funding under the Climate-Friendly New-Build scheme applies, and know the requirements of subsidised housing funding programmes. In Berlin, Milieuschutz (social preservation rules) and the conversion ordinance (Umwandlungsverordnung) are part of our standard due diligence.

Existing buildings, infill development and mixed quarters

Additional floor area is often hiding in existing buildings. We extend, add density and repurpose: at the Alte Post in Neukölln, 56 furnished Micro Apartments complete a listed ensemble; in Lustnau, a listed quarter is being converted so that housing, highly specialised laboratory space and a landscaped courtyard come together. Where upmarket specification is called for, we draw on our experience from exclusive residential construction.

Talk to us

209

Apartments in the largest quarter

104

of which subsidised (BayernHeim)

56

Micro Apartments in existing buildings

5%

Accuracy of the cost forecast

we design architecture

SEBASTIAN BLANCKE AND MATHIS MALCHOW Architects Berlin

From commercial projects to residential construction: OOW's award-winning Berlin architects design, conceive and shape both buildings and interiors. Powerful, focused and bold.

Meet the founders!

Selected residential projects

See our projects in other sectors

Häufige Fragen von Entwicklern und Bauträgern

How much lettable floor area can you get out of our site?
We make full use of the permissible floor area ratio and optimise the ratio of living space to gross floor area while keeping the share of circulation space small – the decisive metric for returns. This is based on a feasibility study or planning-law study carried out at the outset.
What construction costs per square metre should we currently expect?
We calculate the costs for your project as a projection from our own cost database. Our self-developed cost-rate system works out roof, façade and shell construction as well as fit-out and building services trades using our own benchmark figures. On the basis of a planning-law study, we achieve cost forecasts accurate to within around five per cent.
Can you design to a fixed cost ceiling?
Yes. We design to cost against your ceiling, continuously test against our benchmark figures, and document costs to DIN 276 – a robust cost calculation is in place by service phase 3 at the latest.
What does the architect cost – how do you bill?
Under HOAI 2021 (freely negotiable), usually fee band III to IV. A lump-sum fee, a cap on eligible costs, or a structure linked to cost and schedule targets are all possible. Individual service phases can be commissioned separately.
Do you design subsidised and social housing?
Yes. At Milchhof Carré Ansbach, 104 of 209 apartments are income-based subsidised housing (BayernHeim), plus around 105 student apartments – built to KfW-55 standard. We design in line with funding requirements: apartment sizes, specification and cost ceilings of the relevant state funding programme.
What KfW funding is available in 2026?
Climate-Friendly New-Build (Klimafreundlicher Neubau, KfW programmes 297/298): Effizienzhaus 40 as the standard, with the Sustainable Building Quality Seal (Qualitätssiegel Nachhaltiges Gebäude, QNG) offering a loan of up to 150,000 euros per residential unit. We design the project accordingly and provide the necessary evidence. Applications must always be submitted before construction starts.
What does the GEG mean for our project?
We design in compliance with the GEG (Buildings Energy Act) as currently in force. The amendment of July 2026 (Gebäudemodernisierungsgesetz, Buildings Modernisation Act) replaces the rigid 65 per cent requirement in favour of greater technology openness. We calculate any additional costs for you against the funding terms.
Should our site be assessed under a development plan (Bebauungsplan) or under § 34 BauGB?
We clarify this at the outset – including boundary setbacks, possible exemptions, and whether the Bau-Turbo fast-track provision under § 246e BauGB (in force since October 2025) allows temporary departures in favour of residential construction.
Milieuschutz or conversion ban – what applies in Berlin?
We check whether a social preservation statute (soziale Erhaltungssatzung, § 172 BauGB) applies, and whether Berlin's conversion ordinance (Umwandlungsverordnung) under § 250 BauGB is relevant – the new ordinance has been in force since January 2026. This affects modernisation, conversion into individual ownership, and your exit strategy.
How many parking spaces do we have to build?
In Berlin there is no longer a mandatory requirement for car parking spaces, only for bicycle and accessible parking; elsewhere, the local parking ordinance applies. We assess whether an underground car park actually pays off for the specific project.
How many apartments have to be accessible?
The proportion follows from the relevant state building code; the technical benchmark is DIN 18040-2, with higher requirements for wheelchair-accessible apartments. This affects the lift, circulation and space requirements – we build it in from the very beginning.
Do you build in existing structures, infill development and additional storeys?
Yes. Alte Post Neukölln (56 Micro Apartments at a listed ensemble) and Lustnau (a listed quarter with housing and laboratories) show how additional floor area is created within existing buildings.
Do you take on site supervision – and how do you ensure schedules are kept?
We take on service phases 1 to 9, including site supervision. You receive a robust milestone plan through to the building application and construction, ongoing reporting, and active early warning of any deviations.
Do you also design upmarket specification and luxury units?
Yes – for penthouses, exclusive owner-occupied apartments and villas, see our page on exclusive residential architecture.

we design architecture

From commercial projects to residential construction: OOW's award-winning Berlin architects design, conceive and shape both buildings and interiors. Powerful, focused and bold.

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