National Highways, NHSS

Lowther Forestry Group holds ongoing accreditation to the National Highways Sector Schemes 18A, 18B and 18C. As approved highways landscaping and arboricultural contractors, we deliver compliant, high-quality soft landscape and tree services across motorways, trunk roads and strategic routes throughout the United Kingdom.

What NHSS Accreditation Covers

NHSS approval confirms that we meet nationally recognised standards for quality, health and safety, environmental management and biodiversity. This is evidenced through continuous independent auditing and external accreditation. From surveys and soil preparation to tree planting, seeding and long-term maintenance, our skilled teams provide solutions designed specifically for highway environments.

We deploy accredited supervisors, specialist plant and digitally tracked workflows to keep programmes on schedule while minimising disruption to traffic and communities. All operatives hold required sector qualifications and CSCS/CPCS cards. Works are executed to Scheme 18 standards alongside our ISO quality and environmental procedures and client-specific specifications.

Our accreditation covers all land-based sectors under NHSS 18. Scheme 18A covers arboricultural activities, including professional tree inspection, mechanical tree and vegetation removal, and maintenance of established trees and shrubs. Scheme 18B covers pesticide and pest control activities, including the management of invasive and protected species, and measures for invertebrates and vertebrates. Scheme 18C covers land-based planning and management, including ground preparation, tree and herbaceous plant maintenance, water bodies and litter picking.

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NHSS 18A, 18B
and 18C Accredited

Fully accredited for landscaping and arboriculture on the strategic road network, covering soft landscaping, hard landscaping and maintenance.
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Same Team,
Tender to Delivery

The team that prices and plans your project is the same team that delivers it on site. This continuity reduces risk, improves communication and keeps programmes on track.
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Severndale
Contract-Grow Nursery

Our nursery at Severndale in Shrewsbury grows trees, shrubs and hedging to order, giving us direct control over stock quality, biosecurity and programme-critical supply.

Trusted by the UK's Leading Contractors

Lowther Forestry Group works as a trusted landscaping subcontractor to many of the UK's largest construction and infrastructure firms. These relationships are built on decades of reliable delivery, competitive pricing and the ability to mobilise skilled teams at short notice across the country. Many of our Tier 1 clients have worked with us continuously for over ten years, returning project after project because of the consistency and quality we bring to their programmes.

Trusted By Main Contractors, Utilities and Public Bodies

Selected Project

Testimonials

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Great service for firewood - good quality logs.

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Jim White

Company Name

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Top class people to deal with. Tash in head office is great. Contracts manager Tom is a great lad. Done a lot of business with them over the years, always first class.

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Steven Reaper

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Nationally recognised accreditations

NHSS 18A, 18B and 18C for landscaping and arboriculture on the strategic road network. ISO 9001 (quality management), ISO 14001 (environmental management) and ISO 45001 (health and safety).

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Five Offices Across the UK

Our landscaping teams operate from five offices across England, providing national coverage with local knowledge. Penrith (head office, Cumbria and the North), Castleford (Yorkshire and the North East), Runcorn (North West and North Wales), Milton Keynes (South East and East Anglia) and the West Midlands, where our Severndale contract-grow nursery supports large-scale planting programmes across the region and beyond.

Common Questions About NHSS Accredited Services

What is NHSS 18?
NHSS 18 is a set of National Highways Sector Schemes that define quality and competence standards for landscaping and arboricultural services on the strategic road network. It is split into three sub-schemes: 18A for arboricultural activities, 18B for pesticide and pest control, and 18C for land-based planning and management. Contractors must demonstrate compliance through regular independent audits.
Why does NHSS accreditation matter for highways work?
NHSS accreditation confirms that a contractor meets the specific quality, safety and environmental standards required by National Highways. It provides assurance that operatives are appropriately qualified, that work is carried out to defined procedures, and that performance is independently audited. Many highway authorities and principal contractors require NHSS accreditation as a condition of appointment.
What is the difference between NHSS 18A, 18B and 18C?
Scheme 18A covers arboricultural activities such as tree inspection, mechanical tree and vegetation removal, and maintenance of established trees and shrubs. Scheme 18B covers pesticide and pest control, including the management of invasive and protected species, and control measures for invertebrates and vertebrates. Scheme 18C covers land-based planning and management, including ground preparation, planting, maintenance of herbaceous plants and water bodies, and litter picking.
Do all your operatives hold sector qualifications?
Yes. All operatives deployed on NHSS-accredited works hold the relevant sector qualifications for their role, along with valid CSCS or CPCS cards. Supervisors hold additional accreditation specific to the scheme under which they are working. Training records and competency are subject to ongoing audit as part of our NHSS accreditation.
Can you support emergency callout on the strategic network?
Yes. We provide emergency response services for arboricultural and landscaping incidents on the strategic road network. Our teams are available to respond to storm damage, fallen trees, sight-line obstructions and other urgent requirements. With offices across the UK, we can mobilise qualified operatives and specialist equipment at short notice to support safe, compliant clearance and reinstatement.