Green infrastructure is no longer just a “nice-to-have” — it’s becoming a planning requirement. From pocket parks to green roofs, local authorities are looking for ways to integrate nature into urban environments. One of the most effective planning tools to support this is the Urban Greening Factor (UGF).
Across the UK (and in major cities worldwide), large urban areas are losing valuable and necessary accessible green space. This intensifies the urban heat island (UHI) effect and brings other negative consequences, such as poorer public health, greater flood risk, and declines in urban biodiversity.
To help reverse this trend, the Mayor of London has included urban greening requirements in the London Plan and introduced the Urban Greening Factor (UGF), a planning metric that scores the quantity and quality of greenery proposed on development sites. This article will explore what the Urban Greening Factor is, and importantly, how it affects businesses within London.
What Is the Urban Greening Factor?
The Urban Greening Factor (UGF) is a planning tool used to measure the quality and quantity of green infrastructure within a proposed development. By assigning weightings to different types of urban greening — such as trees, green roofs, or permeable surfaces — it ensures developments deliver meaningful ecological and social benefits.
- In London, UGF is enshrined in Policy G5 of the London Plan (2021). All major developments must demonstrate how they meet minimum UGF targets (0.4 for residential and 0.3 for commercial).
- Beyond London, the UK government has encouraged uptake nationally. Natural England has developed a “Model UGF for England”, which many local planning authorities are now exploring. Places such as Southampton and Swansea have already trialled similar approaches, and more councils are expected to follow.
In practice, a site is mapped into surface cover types, with each surface type being assigned a weighting (between 0 and 1) that reflects its ecological and climate benefits. For each surface type, you multiply the area by its factor, add those products together, and divide the total by the site’s overall area. The resulting number is the site’s UGF score, which is then compared with the policy target so you can see whether the scheme meets the required standard.
UGF Example
Picture a development site of 1,000 m² with the following surface breakdown:
- Tree canopy (200 m²): Factor 1.0 → 200 × 1.0 = 200
- Semi-natural planting (150 m²): Factor 1.0 → 150 × 1.0 = 150
- Intensive green roof (100 m²): Factor 0.9 → 100 × 0.9 = 90
- Extensive green roof (150 m²): Factor 0.7 → 150 × 0.7 = 105
- Permeable paving / SuDS (100 m²): Factor 0.3 → 100 × 0.3 = 30
- Sealed hardstanding (300 m²): Factor 0.0 → 300 × 0.0 = 0
Now add the weighted areas: 200 + 150 + 90 + 105 + 30 + 0 = 575
Divide the total weighted score by the site area to get the UGF: UGF = 575 ÷ 1,000 = 0.575
A UGF of 0.575 (57.5%) would comfortably exceed the London Plan minimum (0.4 for mainly residential and 0.3 for mainly commercial schemes), so this scheme would meet typical policy expectations. It’s important to note that the minimum is not a target to match; the greater this is exceeded, the better.
How Should the Urban Greening Factor Be Applied?
When a developer submits a planning application, the UGF calculation is normally delivered as a clear package of drawings and tables so planners can see where greening will be provided and how the score was worked out.
The Greater London Authority (and accompanying guidance) ask for a colour-coded UGF masterplan (a site drawing keyed to surface-cover types) together with a completed UGF table or calculator export and a short design narrative explaining assumptions (tree canopy extent, green roof depth classes, SuDS treatments, etc.).
The UGF is a design-and-site-based greening score, not a substitute for Biodiversity Net Gain (BNG), ecological surveys, or arboricultural assessments. Planners usually expect UGF to be used alongside BNG, SuDS assessments, and other environmental submissions. Therefore, a scheme’s cooling, drainage, and biodiversity outcomes are considered together.
Why Is the Urban Greening Factor Crucial for Businesses in London?
For businesses in London, the UGF is far more than just a technical calculation: it’s now a core part of how new developments are assessed. For those who build, occupy, or invest in property in the capital city, the UGF influences design decisions, planning outcomes, and even long-term operating costs. Therefore, it pays to understand what it measures and how to respond.
Here’s why the UGF is crucial to your business:
1. It’s a Planning Requirement for Major Developments (Policy G5)
The London Plan’s Policy G5 requires major developments to treat urban greening as “a fundamental element of site and building design”. This makes the UGF the practical metric planners use to demonstrate compliance, so expect a UGF assessment to be part of the application pack.
2. The UGF Affects Whether (and How) Your Scheme Gets Consented
UGF is considered at the application stage, so underperforming schemes are likely to be asked to revise designs, add on-site greening, or justify why targets can’t be met. Getting greening right at the concept stage reduces the risk of design changes or refusal at committee.
3. It Reduces Regulatory Risk and Programme Cost
Addressing the UGF early limits the chance of late-stage conditions, rework, or negotiation with planning officers - all of which add time and cost. Treating greening as a design driver, rather than an afterthought, shortens the approval pathway and improves your project’s cost certainty.
4. It Drives Real Business Benefits (Cooling, Drainage, Staff Wellbeing)
The UGF incentivises high-value green infrastructure, such as living walls, which helps to cool buildings, cut surface water run-off, and improve amenity. These outcomes lower operating risks (flooding, overheating), improve staff and customer wellbeing, increase visual interest, and protect asset value.
How Can Businesses Increase Their UGF Score?
Fortunately, there are many different ways that you can implement greening into a property development plan. Here are six of the most common methods that businesses in London love:
Permeable Paving
Permeable paving allows rainwater to pass through its surface into a specially designed sub-base, reducing surface water run-off and supporting sustainable drainage. To get the most from it, design the sub-base to store and slowly release water, and maintain the surface to prevent clogging by sediment buildup.
Green Roofs
Installing planted roofs (intensive or extensive) adds usable green area without taking up ground space, helping to cool buildings, improve insulation, and slow rainwater runoff. They work well on flat or gently pitched roofs but require structural checks, appropriate waterproofing, and an ongoing maintenance plan to keep plants healthy and drains clear.
Green Walls
Living facades or modular green wall systems bring vertical greenery to narrow plots, improve air quality, and provide visual benefits for staff and customers. They vary from lightweight, low-maintenance moss panels to soil-based systems that need irrigation and regular pruning. Also known as “living walls”, these systems can be found on both the exterior and interior of properties.
Street Trees
Planting and maintaining street trees is one of the highest-impact ways to increase canopy cover, reduce urban temperatures, and improve pedestrian comfort and biodiversity. Work with the local highway authority (such as the City of London Corporation) on species, planting pits, and root protection, and plan for long-term watering and pruning to ensure trees grow healthily without damaging pavements or other nearby services.
As an alternative to street trees, you could opt for hedges or ornamental shrub beds.
Pocket Parks & Micro Forests
Converting small underused plots or car parking areas into pocket parks or densely planted micro-forests creates high-value green space for staff breaks and community use. These interventions improve habitats for local wildlife, and they repay your investment through improved property appeal, mental wellbeing and increased footfall.
Rain Gardens
Rain gardens and planted SuDS features capture and slowly infiltrate surface water, reducing runoff and flash flooding while creating habitat and visual interest. They’re highly effective where surface water is a risk; good design requires assessment of soil permeability, an overflow route, and a planting palette tolerant of both wet and dry spells.
Living Pillars
Vegetated street lighting columns are compact greening features that add vertical biodiversity and soften hard public spaces. Known as “living pillars”, they can help mitigate the “street canyon effect”, where pollution from urban spaces is trapped at street level. Typically, these installations are solar-powered and recycle irrigation water to fully embrace sustainable practice.
What Are the Other Benefits of Urban Greening?
The practice of urban greening is beneficial for the environment, the economy, and wider society. Here’s why:
Environmental Benefits
- Urban greening improves local air quality by capturing particulates and absorbing pollutants through leaves and soil
- Vegetation reduces the urban heat island effect via shading and evapotranspiration, lowering local temperatures
- SuDS and planted areas slow and store rainwater, reducing surface runoff and lowering flood risk
- Green spaces create and connect habitats, increasing urban biodiversity and supporting pollinators and birds
- Vegetation and earthworks can also dampen noise, improving acoustic comfort in busy streets
Economic Benefits
- Meeting Policy G5 expectations smooths the property planning process, reducing the risk of delays, conditions, or refusals
- Greener neighbourhoods and buildings tend to attract higher rents and sale values because they are more desirable
- Tree shading and green roofs lower operational energy costs by reducing cooling and, in some cases, heating demand
- Reduced flood and overheating risk cuts long-term repair and business-interruption costs for assets
- Attractive green spaces boost footfall and customer dwell time, which benefits retail and hospitality businesses
- Delivering greening can create local jobs in landscaping, installation, and ongoing maintenance
Social Benefits
- Access to green space improves mental wellbeing, reducing stress and supporting better mood and concentration
- Parks, tree-lined streets, and green corridors encourage walking, cycling, and other exercise
- Shared green places build community cohesion by providing informal meeting spaces and civic amenities
- Urban greening offers educational and recreational opportunities for schools, employees, and residents
- Well-maintained green spaces often correlate with increased feelings of safety, which in turn improves a neighbourhood's reputation
Explore Our Range of Innovative Green Solutions for Urban Spaces
The Urban Greening Factor is transforming the way we think about city design. In London, it’s already a mandatory part of planning, and with Natural England’s model now in place, more local authorities across the UK are beginning to adopt it. For architects, developers, and planners, this means designing with nature is no longer optional — it’s an expectation.
At Scotscape, we specialise in delivering UGF-compliant green infrastructure nationwide. From Living Walls to Micro Forests and Living Pillars, we provide the expertise to help projects not only meet planning requirements but also create healthier, more resilient places to live and work.
Whether you’re working on a London development or a project elsewhere in the UK, our team is ready to guide you through the process — from design and installation to long-term maintenance — ensuring your urban greening strategy delivers maximum impact.
To play your part, please get in touch with our expert team to discuss what solutions may be best for your workplace. If you’d like to learn more about any of our products, please don’t hesitate to ask!
