Carbon reduction in landscape architecture is often discussed through materials: lower-carbon paving, recycled aggregates, local sourcing and better specifications. These all matter, but they are only part of the picture.
The bigger shift is to see carbon as a design management issue, not a calculation carried out at the end of a project. Decisions made during briefing, concept design and coordination often determine the carbon footprint long before quantities are measured. The extent of hard landscape, the treatment of existing soils, the retention of trees and vegetation, imported topsoil, drainage strategy, planting resilience and long-term maintenance are all carbon decisions.
The Landscape Institute’s Landscape Carbon Overlay to the RIBA Plan of Work sets out a clear framework for reducing carbon across project stages, including the need to think across the lifecycle, specify low carbon, protect carbon stores, reduce hard landscape, increase soft landscape and design responsively. These actions are not isolated technical tasks. They are design management principles.
Carbon starts before the calculator
Carbon tools are useful, but they cannot rescue a design that has already locked in high-carbon decisions. A calculation is only meaningful if it happens early enough to influence the design.
At concept stage, landscape teams should be asking: what can be retained, reused or protected? Can unnecessary hard surfaces be reduced? Are we working with the existing ground conditions rather than against them? Are carbon implications being discussed with architects, engineers, cost consultants and clients before options become fixed?
In practice, this means treating carbon as part of the normal design conversation, alongside cost, buildability, accessibility, ecology, maintenance and user experience. It also means understanding the existing site properly before deciding what needs to change. Some of the most valuable carbon decisions may be the least visible ones: retaining soil, avoiding unnecessary excavation, protecting existing vegetation or simplifying a construction build-up.
Landscape architects are often expected to add green value to a project. In a climate-conscious design process, our role needs to be more strategic than that.
We are trained to think across systems, timescales and living processes. That makes the profession well placed to connect carbon with biodiversity, water, soil health, climate resilience, public realm quality and long-term stewardship.
This requires active design management. “Less hard, more soft” sounds simple, but on live projects it means challenging unnecessary paving, coordinating drainage and levels, protecting soft landscape budgets, and ensuring value engineering does not remove the elements that support long-term performance.
It also requires collaboration. Carbon decisions rarely sit neatly within one discipline. A level change, drainage strategy, below-ground service route or access requirement can all influence the amount of excavation, imported material, hard surfacing and replacement planting. Landscape architects need to be part of those conversations early enough to shape the outcome.
The regeneration of Smedley’s Hydro in Matlock provides a compelling example of how landscape design management can influence carbon outcomes from the earliest project stages. As the restoration and redevelopment of a significant historic site, the project required a careful balance between heritage conservation, accessibility, environmental enhancement and long-term resilience.
By retaining and working with existing landscape features wherever possible, enhancing biodiversity, minimising unnecessary intervention and integrating sustainable landscape strategies into the wider masterplan, the scheme demonstrated that low-carbon design is often achieved through thoughtful stewardship rather than extensive replacement. The project reinforces the principle that landscape architects can play a critical role in coordinating decisions around land use, ecology, public realm and infrastructure to deliver lasting environmental and social value.
Smedley's Hydro, Matlock
Whole life thinking not just embodied carbon
For landscape, carbon cannot be understood only at construction stage. Landscapes are living assets. Their impact changes over time through establishment, growth, maintenance, replacement and adaptation.
A tree pit detail is not only a cost or construction item. It affects tree establishment, canopy growth, urban cooling, carbon storage and replacement risk. A soil strategy is not only an earthworks exercise. It affects drainage, planting resilience, carbon storage and maintenance.
This is where design management has an important role. A scheme that appears efficient at handover may not be low carbon over its life if it depends on high levels of replacement, irrigation, intensive maintenance or materials that weather poorly. Similarly, a landscape that is given enough space, soil volume and realistic aftercare is more likely to perform over time.
A low-carbon landscape is therefore not simply one with fewer materials. It is one that is durable, maintainable, biodiverse, climate-adapted and able to support people and nature in the long term.
From aspiration to decision making
Many projects now include ambitious language around net zero, biodiversity and climate resilience. The challenge is turning that aspiration into repeatable decisions.
A carbon-conscious landscape design process should include carbon intent at briefing stage, carbon review during option appraisal, carbon-led coordination with other disciplines, disciplined specification, and maintenance planning that supports long-term performance.
For multidisciplinary practices, there is a particular opportunity here. Landscape, architecture, interiors, sustainability and technical teams often influence the same outcomes from different angles. Bringing those conversations together early can help avoid duplicated effort, over-designed solutions or late-stage changes that add carbon without improving quality.
This does not need to be complicated. It can start with clearer questions at design reviews: what existing assets are we protecting? What assumptions are driving the extent of hard landscape? What happens to the soil? How will this be maintained? Which decisions are increasing carbon, and are they justified by long-term value?
The profession needs confidence, not perfection
Landscape carbon data is still developing, and the complexity of soils, habitats, planting and maintenance means there will always be judgement involved. But uncertainty should not become an excuse for inaction.
The next stage of low-carbon landscape design is not just better calculation. It is better leadership.
Landscape design management is where ambition becomes reality. It is where we decide whether to protect or remove, reuse or import, simplify or overbuild, nurture or replace. At its best, it brings together carbon, biodiversity, social value, wellbeing and long-term resilience.
That is where landscape architects can make a real contribution: not by treating carbon as a separate technical exercise, but by embedding it into the everyday decisions that shape better places.
