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by Sean Hill on Feb 4, 2026
London's Victorian housing stock is extraordinary. Generous proportions. Handmade brick. A civic confidence baked into every facade.
It is also - without intervention - chronically underperforming.
Poor thermal envelopes. Seasonal overheating. Layouts that turn their back on the garden. Energy costs that compound year on year.
The question RISE Design Studio keeps returning to is not whether to preserve or upgrade. It is whether we are bold enough to do both - at the highest possible standard.
The full rear composition - a social firepit terrace anchors the outdoor space, with the glazed extension drawing the interior and garden into a single continuous environment.
☉ The EnerPHit Standard - What It Actually Means
EnerPHit is not a badge. It is a discipline.
Developed from Passivhaus principles, it sets a rigorous performance benchmark for retrofitting existing buildings - one that goes far beyond surface upgrades or bolted-on renewables.
A fabric-first methodology demands attention to:
- Continuous, high-performance insulation across walls, floors, and roof
- Airtight construction with certified detailing
- High-specification triple glazing, carefully positioned
- Systematic elimination of thermal bridges
- Mechanical Ventilation with Heat Recovery (MVHR) → delivering consistent fresh air without heat loss
The result is a home that performs quietly and consistently. Warmer through winter. Cooler through summer. Healthier in every season - and radically less dependent on carbon-intensive energy sources.
Sustainability here is structural, not cosmetic.
The extension set within a naturalistic garden - layered planting, foxgloves, and salvias framing the glazed volume. Landscape as architecture, not afterthought.
→ The Role of the Extension
A rear extension on a deep retrofit project is more than additional floor area.
Positioned and detailed correctly, it becomes the architectural hinge - mediating between the existing building's thermal strategy and the garden beyond.
At RISE, we approach extensions through this lens:
- Glazing as a considered tool, not a default gesture - angled, recessed, and shaded to manage solar gain before it becomes a problem
- Thermal mass integrated into the structure, absorbing heat during the day and releasing it gradually through the evening
- Green roofs and planted terraces reducing surface temperatures, improving biodiversity, and softening the boundary between built form and landscape
- Sunken or stepped connections to the garden - resolving level changes while creating layered outdoor experience that extends the usable living environment across seasons
No heavy-handed canopies. No bolt-on louvres. Architecture doing the work it should.
Contemporary rear extension to a Victorian terrace in Notting Hill - pigmented render envelope, full-height angled glazing, and planted roof terrace mediating between the existing brick facade and the garden below.
☉ Overheating - The Overlooked Problem
Overheating is the sleeper issue in London retrofits.
Large-format glazing - often specified precisely because clients and architects want connection to the garden - creates exactly the conditions for solar overheating in a city that is warming year on year.
The passive strategies that genuinely work are not dramatic:
- Glazing depth and recess to provide self-shading
- Planting canopies that filter summer light while allowing low winter sun
- Cross ventilation paths designed into the section
- MVHR systems calibrated for seasonal purge ventilation
When these are resolved at design stage, they disappear into the architecture. When they are left to later, the solutions are always worse - and always more visible.
→ Landscape as Architecture
The garden is not a backdrop.
On retrofit projects in particular, landscape plays a structural role in the sustainability strategy - managing surface water, providing shade, supporting biodiversity, and extending the thermal comfort zone of the building outward.
At RISE, we treat the outdoor environment as a continuation of the interior - with the same rigour applied to planting layers, edge conditions, and year-round usability as we apply to the building itself.
The outcome is not a designed garden in the decorative sense. It is an integrated ecology - calm, resilient, and quietly demanding of the same attention as the architecture it surrounds.
☉ What Notting Hill Clients Are Actually Asking For
The brief has changed.
Clients in Notting Hill - and across London's mature residential neighbourhoods - are arriving with a more sophisticated set of questions than a decade ago:
- How will this perform in 20 years, not just look on completion?
- What is the embodied carbon position?
- Can we reach EnerPHit standard without compromising the character of the house?
- How does the design address overheating given the glazing we want?
These are the right questions. And they require architects who have been building the technical capability to answer them - not just the design confidence.
RISE Design Studio has been working at the intersection of heritage retrofit, Passivhaus thinking, and contemporary design across London for over a decade. This is not a new service line. It is the work we were built to do.
→ Working with RISE in Notting Hill
If you are considering a whole-house retrofit, a rear extension, or a deep sustainability upgrade to a Victorian or Edwardian property in Notting Hill - the scope of what is possible is larger than most clients initially anticipate.
Done well, this is not a renovation.
It is a reorientation → of how the building works, how it feels, and what it costs to run - for the decades ahead.
The most sustainable building is the one that already exists. Our job is to make it perform like it was built for the future.
Transforming Notting Hill's Victorian Homes
At RISE, we believe that an EnerPHit retrofit is never just a technical exercise. It is an act of stewardship - taking a building with history and character and quietly transforming what it is capable of. That performs without compromise. That is as considered in its sustainability as it is in its design.
Thinking about a deep retrofit or contemporary extension in Notting Hill? Let's talk about how your home could perform better - for you, and for the future.
→ Email us at architects@risedesignstudio.co.uk
→ Or call the studio on 020 3947 5886
RISE Design Studio, Architects, Interior Designers + Sustainability Experts
☉ Architecture for people and planet
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