Every row house renovation faces a fundamental question: should you refurbish the original structure or tear it down and build something new? A 164-square-meter project in Terrassa, Barcelona demonstrates how to approach this decision with real data. The property, a 100-year-old row house for a family of four, had roof damage at the back, a stairwell that needed removal for parking access, and original front sections with irreplaceable character. The answer was not a full demolition or a full renovation, but a targeted combination of both. This project provides a framework for transforming historic row houses into modern living spaces through selective intervention.
Assessing the Existing Structure
The first step in any row house renovation is a thorough structural assessment. In this case, the building had two distinct conditions. The front section retained the charm of a 100-year-old house with solid brick walls and a sound building envelope. The back section had suffered structural damage from years of roof leaks and inadequate maintenance. The stairwell also needed to be demolished to make room for a parking area, one of the clients’ non-negotiable requirements.
Creating a Damage Assessment Checklist
Before deciding between refurbishment and rebuilding, conduct a systematic evaluation of these structural elements:
- Roof condition: check for leaks, rot, and damaged rafters in every section
- Foundation integrity: look for cracks, settlement, and moisture damage at ground level
- Wall stability: test load-bearing walls for cracking and mortar deterioration
- Building envelope: inspect the exterior cladding for water penetration points
- Vertical circulation: assess stairs for structural soundness and code compliance
When to Keep and When to Demolish
The Terrassa project kept the front section where the structure and envelope were sound. The back section, where roof damage had compromised the framework, was demolished and rebuilt. This selective approach saved the character-rich original brick walls and high ceilings at the front while creating a modern, energy-efficient extension at the back. For homeowners facing similar layout problems, row house kitchen remodels addressing awkward layouts follow the same principle of keeping what works and replacing what does not.
| Structural Element | Front Section | Back Section |
|---|---|---|
| Age | 100+ years | Original, damaged by leaks |
| Roof condition | Sound, maintainable | Failed, required replacement |
| Building envelope | Intact, refurbishable | Compromised, needed rebuild |
| Character value | High: original brick and charm | Low: damaged structure |
| Decision | Keep and refurbish | Demolish and rebuild |
Energy Performance as a Design Driver
One of the most compelling arguments for partial rebuilding is the energy performance improvement it delivers. The completed Terrassa renovation achieved a total primary energy consumption of 48.08 kWh per square meter per year with total CO2 emissions of 10.39 kgCO2 per square meter per year, earning an Energy Performance Certificate rating of A. These numbers came from the combination of a refurbished front shell and a new, well-insulated rear extension.
Comparing Energy Performance Across Renovation Approaches
A full refurbishment of a 100-year-old row house typically achieves an EPC rating of D or C, because the original envelope cannot match modern insulation standards without extensive internal work. A full demolition and rebuild can achieve an A rating but loses the character and embodied carbon of the original structure. The selective approach in this project delivered A-rated performance while preserving the front facade and original brick walls. These energy outcomes are consistent with passive house network discussions on balancing heritage retention with modern efficiency standards.
What the Energy Data Means for Homeowners
An EPC rating of A translates to annual heating and cooling costs roughly 60 to 70 percent lower than a typical unrenovated row house of similar size. The 48.08 kWh/m2/year figure places this renovated home in the same efficiency class as a new-build passive house, despite retaining a 100-year-old front section. For families planning a row house renovation, this data point provides a clear target for what is achievable with a hybrid approach.
Preserving Character While Adding Modern Space
The Terrassa project made deliberate choices about which original features to keep. The front facade and entry area retained the original brick wall, visible from the moment you walk through the front door. The living room and dining area feature the same exposed brick, paired with new wood ceiling and floor finishes. The contrast between old white-painted walls and new wood surfaces gives the rooms a layered feel that cannot be replicated in a full rebuild.
Material Strategies for Blending Old and New
The renovation used materials that respect the original character while meeting modern performance standards. Wood was intentionally left unpainted to match the white-painted existing walls. The concrete floor finish in the kitchen provides durability and ties the new rear section to the ground floor visually. Original brick was left exposed in the entrance, living room, and dining room to maintain visual continuity with the home’s history.
This approach mirrors the material honesty seen in modern barnhouse design principles, where original structural materials are left visible as a design feature rather than covered up. The same logic applies here: the brick wall is not a decorative addition but the original load-bearing structure, now revealed and celebrated.
Space Planning for the Expanded Layout
The client’s parking requirement drove the most significant structural change. Removing the original stairwell freed up the front ground floor area for a garage, while a new staircase was constructed in the rebuilt rear section. This reconfiguration shifted the vertical circulation from the front to the back of the house, opening up the entire ground floor for an open living-dining-kitchen layout connected to a rear porch.
Flow and Zoning in the New Layout
The new floor plan follows a clear front-to-back progression. The front entrance leads past the original brick wall into the living room with its wooden ceiling and floor. The dining room connects directly, with the exposed brick wall visible throughout. The one-wall kitchen at the rear features a concrete floor finish that distinguishes the work zone from the living areas. A new wooden staircase leads to a new attic level created from the same type of wood. The children’s rooms on the upper floor are separated from a dedicated playroom. For window selection in extended structures, window selection strategies for open-plan homes guide decisions about natural light distribution across the expanded footprint.
| Floor Level | Original Use | Renovated Use |
|---|---|---|
| Ground floor front | Stairwell and entrance hall | Garage and entrance with brick wall feature |
| Ground floor middle | Enclosed rooms | Open living and dining room |
| Ground floor rear | Damaged structure | Kitchen and rear porch, new staircase |
| Upper floor | Bedrooms | Children’s rooms separated from playroom |
| Attic | Unused void | New habitable attic room |
Material Choices for Extended Structures
When a row house renovation combines retained original sections with new construction, material choices determine whether the finished home feels coherent or disjointed. The Terrassa project used wood as the unifying element. The wooden ceiling and floor in the living room match the wooden staircase and the new attic construction. This repetition of a single material across old and new sections creates visual continuity.
Three Material Principles for Hybrid Renovations
- Repeat one material across old and new sections to create visual flow: in this case, wood in ceilings, floors, and stairs
- Use contrasting materials deliberately to mark functional zones: concrete floor in the kitchen signals a work area
- Preserve original materials where they are sound: the brick wall becomes a design feature at no additional cost
This material strategy is consistent with how showcase homes inspire real-world design, where material continuity across old and new construction is a defining characteristic of successful renovations.
Integrated Design for Partial Renovations
The Terrassa project demonstrates that the refurbish-versus-rebuild decision does not need to be binary. A targeted partial rebuild achieved a higher energy rating and better functionality than a full refurbishment, while retaining more character and embodied carbon than a full demolition. The design strategy responded directly to the state of the building: keep the sound front section, replace the damaged rear section, and let the transition between old and new become a design feature in itself.
Key steps in executing a partial renovation approach include: Commission a detailed structural survey before making any design decisions. The survey results will tell you which sections are worth keeping and which need replacement. Set clear energy performance targets at the outset. Targeting an A rating from the beginning ensures the new construction sections meet modern insulation standards. Plan the construction sequence to protect the retained sections during demolition and rebuilding of adjacent areas. Choose a unifying material early in the design process. A single material repeated across old and new sections will tie the project together visually.
For homeowners weighing the cost and complexity of different renovation strategies, passive house design and construction lessons offer additional guidance on achieving high energy performance in partially renovated homes. The hybrid approach adopted in this project produced an A-rated, 164-square-meter family home that retains its original street presence and interior character while delivering modern comfort and efficiency.