House project on existing foundation

In suburban construction practice, it is common for new property owners to purchase land plots with pre-existing underground structures. A professionally developed house project on an existing foundation allows for the rational utilization of leftover structural resources, adapts the layout to personal needs, and significantly saves the budget on excavation and concrete works.

Fig. 1 State of the existing reinforced concrete foundation on the land plot before the design stage.

Analysis of Ready Structures and Baseline Data

In 2019, a land plot near Kyiv was purchased for the construction of a modern suburban cottage. At the time of purchase, the previous owner had already built a solid foundation on the site. The new client made a logical decision not to demolish the monolith but to build a residential house on the existing base. A full-scale basement was located under a part of this foundation, reliably covered with industrial reinforced concrete panels, which was preserved to serve as a technical utility zone.

Architectural Solution and Ground Floor Layout

What is the floor plan of a house on an existing foundation?
The ready-made project provides a rational single-story layout, including three cozy bedrooms, a spacious kitchen-dining area with direct access to a summer terrace, and an integrated garage for two vehicles. The geometry of the new load-bearing walls perfectly matches the contours of the pre-existing foundation, completely eliminating the need for additional expensive excavation works.

Fig. 2 Optimized ground floor plan with an integrated double garage box.

Based on the complex contours of the existing construction footprint, the bureau's architects developed a detailed working project for a single-story house. The day zone is represented by a large kitchen-dining area directly adjacent to the utility rooms. The private night zone includes three isolated bedrooms, which is optimal for a family of 3–4 people. The main design feature was the attachment of a spacious car garage box directly onto the pre-existing underground structures.

Transforming the Attic into a Living Mansard

Can you arrange a second floor on an existing foundation?
This house project includes a spacious open-plan attic that can be easily converted into a living mansard floor by the owners if needed. To ensure maximum daily comfort, a dedicated space for full-scale stationary stairs is designed in advance in the entrance hall area. This allows for expanding the living space of the suburban cottage without a major overhaul of the roof truss system.

Fig. 3 Floor plan layout of the spacious attic-mansard with a pre-designed structural stairwell.

Exterior, Facade Solutions, and Site Improvement

The architectural image of the cottage is executed in a restrained European style. Large window openings provide excellent insolation for the living rooms. From the backyard side, an open summer terrace adjoins the house, serving as a logical extension of the kitchen-dining area during the warm season. The glazing and facade finishes are selected to visually lighten the structure and harmoniously blend the building into the suburban landscape.

Fig. 4 Exterior visualization of the main entrance and facade from the access road side.

Fig. 5 View of the cottage from the garden plot and outdoor recreation zone.

Fig. 6 Linear elevations of the four facades of the building.

Working Project Scope and Structural Engineering Expertise

What is included in the working project blueprints for a ready foundation?
A professional working project contains a complete architectural and structural package of documentation for construction. This includes detailed floor installation plans, engineering calculations of loads on the old reinforced concrete foundation, facade elevations, roof truss system layouts, and comprehensive material specifications required for error-free performance of all works on the construction site.

Fig. 7 Index of drawing sheets and technical scope of the working project documentation.

Fig. 8 General view of the finished printed copy of the house project package.

Architect's Expert Conclusion and Internal Linking

Designing on already finished underground structures requires high qualifications and precise calculations from a specialist, since any mistake in assessing the load-bearing capacity of reinforced concrete can lead to wall deformation. Certified architect Alex Biryukovich successfully completed the adaptation of this object on September 6, 2019, ensuring the full structural safety of the construction.

If you are facing a similar task and looking for practical examples of architectural modernization, you can study our house reconstruction project from the 60s. We also highly recommend exploring all available house reconstruction projects in the catalog of the "Akvilon PRO" architectural bureau to choose the optimal structural scheme for your plot.