Practice Philosophy

Grounded and
Quietly Confident

I understand architecture as a practice: a field of continuous inquiry and refinement. This inquiry doesn't end with a correct or definitive answer, but is continuously refined through exploration within various media: the architectural drawing, the physical model, the written word.

I am neither strictly traditional nor obsessively innovative. I respect tradition and typology, but I do not hold these precedents as sacred and untouchable. I seek rather to continue the work of refining architecture for the particular constraints of today's time and place.

The result is a practice that is grounded and quietly confident. Beautiful and enduring.

"The goal is not just a beautiful home, but one that supports your lifestyle and genuinely helps you flourish."

M.Arch

Princeton

AIA

Member

WELL AP

Accredited

NCARB

Certificate

DC · VA · AR

Licensed

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About the Architect

Kacper Lastowiecki, AIA

I founded this practice to offer a more considered alternative to generic residential design. My practice is small by design. I accept a limited number of projects each year to ensure every client receives my full attention and every home reflects genuine care.

I hold a Master of Architecture from Princeton University and a Bachelor of Architecture from the University of Illinois. Before starting my own practice, I trained at Modus Studio, a nationally recognized firm known for craft and design rigor, and at the University of Arkansas Community Design Center, an award-winning research office focused on how the built environment shapes human health. That foundation informs everything I bring to residential work.

As a WELL Accredited Professional, I bring a rigorous, evidence-based approach to wellness in residential design. The WELL Building Standard covers air quality, water, light, nourishment, movement, thermal comfort, and mental wellbeing. Most homes are designed without any consideration of these factors. Every project I take on is designed with them at its foundation.

Every project is personally led by me from first conversation through construction. No handoffs. No algorithms. Just thoughtful, considered design for how you actually live.

Wellness-Centered Architecture

Health Starts at Home

Despite every attempt at maintaining a healthy lifestyle, it is often our homes that fall most short. From poor air quality to questionable materials to mold and mildew issues, the home environment can be the primary impediment to truly feeling your best.

Whether planning a renovation or new build, every KLPOA project incorporates principles developed by the International WELL Building Institute to ensure your wellbeing is at its foundation.

Air Quality

Material selection and ventilation design that minimizes toxins and maximizes fresh, clean air throughout the home.

Natural Light

Daylighting strategies that support circadian rhythms, mood, and energy. Designed into the architecture from the start.

Healthy Materials

Thoughtful specification of finishes and materials that feel good to live with and support long-term health.

Thermal Comfort

Envelope design and systems that maintain consistent, comfortable temperatures and humidity year-round.

Free Self-Assessment

Is Your Home Supporting
Your Health?

Most people sense something is off about their home long before they can name it. Poor light, stale air, rooms that feel isolating rather than restorative. The Healthy Home Audit is a free five-minute self-assessment that helps you see your home through an architect's lens.

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Thank you, click below to begin the Healthy Home Audit.

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Design Process

A Great Process Feels Effortless

I pride myself on providing a smooth and calibrated design process which ensures that each decision is made with confidence. Schedule transparency and clear outcome expectations allow you to always be in control of the final result.

Initial Consultation

A free, no-obligation conversation to discuss your project goals, timeline, scope, and whether we are a good fit for each other.

Design & Development

A collaborative design process with clear milestones, transparent costs, and regular communication at every stage.

Construction

Personal oversight through construction ensures the design intent is realized exactly as envisioned. No handoffs, no surprises.

Learn More About the Process

A Statement on Artificial Intelligence

Human Work,
Done by Human Hands

Architecture has always been an expression of human creativity and craft. Every design decision at this practice comes from an active collaboration between architect and client. When you reach out, a human being reads and responds.

Your home will be designed by a trained architect who cares about the result.

Never Artificial Intelligence.

Where We Practice

Washington DC & Beyond

The practice is based in the Washington DC area. We practice in and around the District, including Northern Virginia and Maryland, from the Tidewater to the Shenandoah. We are just as happy working on your rural cabin as your DC townhome.

We are licensed in Washington DC, Virginia, and Arkansas. For select projects, we are available to work outside this area. If you have any questions, please contact the practice.

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Licensed Jurisdictions

Washington DC

Licensed Architect

Virginia

Licensed Architect

Arkansas

Licensed Architect

Free Consultation

Ready to Talk About
Your Project?

If you are considering a renovation, addition, or custom home in DC or Northern Virginia, I would love to learn about your project.

Schedule Your Free Consultation

Limited projects accepted per year

A More ConsideredApproach to Design

Grounded andQuietly Confident

Kacper Lastowiecki, AIA

Health Starts at Home

Is Your Home SupportingYour Health?

A Great Process Feels Effortless

Human Work,Done by Human Hands

Washington DC & Beyond

Ready to Talk AboutYour Project?

A More Considered
Approach to Design

Grounded and
Quietly Confident

Is Your Home Supporting
Your Health?

Human Work,
Done by Human Hands

Ready to Talk About
Your Project?