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JN Bentley Ltd

JN Bentley Ltd (JNB) is a leading, privately owned construction services provider in the UK. We now have an annual turnover in the region of £100 million, generated from projects in both the building and civil engineering markets.

JN Bentley

JN Bentley delivers civil engineering contracting services, together with mechanical and electrical expertise. Founded in 1972, the company has grown largely from repeat work, maintaining a focus on providing construction services with an open and honest approach.

The JN Bentley team numbers over 2,000 colleagues. We pride ourselves on our large, directly employed construction workforce, a team that gives us and our clients added assurances for safety and quality.

We look to find innovative solutions to traditional construction challenges, applying the latest technologies to drive efficiency and reach sustainable outcomes.

Across JN Bentley and our design and build companies MMB and JBA Bentley, annual revenue now exceeds £500 million.

Mott MacDonald Bentley (MMB)

MMB provides fully integrated civil engineering feasibility, design, construction and commissioning services to the UK water sector. Established in 1999, it harnesses the contracting strength of JN Bentley and the design specialisms of Mott MacDonald to form a 3,000-strong team – with further expertise brought in from across the Mott MacDonald Group when required.

MMB was formed specifically to deliver long-term, high-volume capital programmes collaboratively with water companies. With a focus on innovation, affordability, and flexibility, since securing its first contracts with Yorkshire Water in AMP3, MMB has grown to deliver work for eight of the largest water companies in the UK.

Bidford-on-Avon STW (2025)

Reaching an oxidation ditch solution for increased FFT and the introduction of phosphorus, ammonia and iron consents

Don Regulators (2024)

Flood risk reduction and improved fish migration across the River Rother catchment with online flood gates and a bespoke full-channel fish pass

Holderness Flood Alleviation Scheme (2024)

Design and construction of new ‘online’ pumping station and flood storage aquagreen to improve resilience in the Humber region

Don Regulators (2023)

The Don Regulators comprise three strategically important regulator gates on the River Rother that are owned, operated and maintained by the Environment Agency (EA). The purpose of the regulators is to reduce the risk of flooding to settlements within the Don catchment, by attenuating flows in the River Rother. JBA-Bentley, in a joint venture relationship, […]

Mill Fleam Pumping Station (2023)

Over recent years, Derby’s city centre has suffered historic river and surface water flooding. In partnership with the Environment Agency, Derby City Council sponsored the £8m Mill Fleam Pumping Station project; a key piece of flood defence infrastructure that barriers off and then over-pumps Markeaton Brook when the River Derwent is in flood. In November […]

Vivian (Six Bells) Mine Water Treatment Scheme (2023)

A mine water treatment scheme was implemented at Vivian (Six Bells) by the Coal Authority as an environmental service under its national remediation programme in 2006. Vivian (Six Bells) is located in South Wales, approximately 20km north of Cardiff next to the village of Abertillery. A mine water discharge from the Vivian Shaft was discovered in […]

South Ferriby Flood Alleviation Scheme (2021)

South Ferriby lies on the south bank of the Humber Estuary, approximately 12 miles from Hull. During a tidal surge in December 2013, the existing flood embankments were inundated causing £50m worth of damage by flooding 129 properties, the CEMEX cement plant, 500 hectares of agricultural land and the A1077. Residents were left fearing for […]

Bentley Ings Pumping Station (2021)

Bentley Ings Pumping Station is located within the River Don flood corridor, north-east of Doncaster and protects over 3,000 residential and 172 commercial properties from fluvial risk. The pumping station was constructed in 1942 and failed in 2007 during an extreme River Don flood event, resulting in flooding to over 1,000 properties. The aim of […]

Bewdley Bank Service Reservoir (2020)

The Hereford Water Network is dependent on a single source of supply from the River Wye and Dŵr Cymru Welsh Water identified a need to assess the resilience of the network to maintain customer supply during any future loss of source supply events. The resulting hydraulic assessment identified the requirement to increase the available storage […]

Foss Barrier (2020)

The Foss Barrier and associated pumping station is a vital asset in the City of York’s flood defences and was constructed in the 1980s in response to severe flooding five years earlier. In flood conditions, a mechanical gate can be lowered to stop rising waters in the River Ouse from flowing back up into the […]

Lynemouth Mine Water Treatment Scheme (MWTS) Phase 2 (2020)

The Lynemouth Colliery was part of a larger mining block linked to Ellington Colliery (Ellington Combine) that worked reserves under the North Sea; the mining block extended inland close to Morpeth. Groundwater lies above the rocks forming the coal measures. If mine water was to rise unchecked, it could pollute a source of water for […]

Foss Barrier (2019)

In December 2015, the most severe floods in a generation hit the City of York. As water levels rose to the highest recorded on the River Foss, they entered the main control building at the Foss Barrier, which forms an important part of the city’s flood defences, rendering the facility inoperable. The Foss Barrier and […]

Ten Acre Impounding Reservoir (2019)

Ten Acre Impounding Reservoir (IRE), located in Haverah Park near Harrogate, is owned and operated by Yorkshire Water (YWS). The reservoir is impounded by an earth-fill embankment dam, approximately 17m above natural ground level at the highest point, with a capacity of 150,000m3 at top water level. The reservoir was constructed by Harrogate Waterworks Company […]

WAMM (Water & Abandoned Metal Mines) Programme (2019)

Abandoned metal mines pollute approximately 1,500km of rivers in England and contribute about 50% of the cadmium, lead and zinc in surface waters despite most closing in the early 20th century. The WAMM (Water and Abandoned Metal Mines) Programme is a partnership between the Environment Agency, the Coal Authority and the Department for Environment, Food […]

Warland Impounding Reservoir (2019)

Warland Impounding Reservoir (IR) is situated on the western slope of Blake Moor, above Littleborough, Lancashire. The reservoir was originally constructed around 1857 by the Rochdale Canal Company to maintain water levels in the Rochdale canal, and was considered to be one of the largest dams in England at the time. It has a 1500m […]

Morpeth Flood Alleviation Scheme Phase 3 (2018)

Morpeth is an historic market town in Northumberland, situated on the River Wansbeck. It has suffered extensively from flooding, experiencing 22 significant flood events since 1839. In 2008, over 1,000 properties in the town were flooded or affected by flooding. The main source of flooding has been from the River Wansbeck, with Cotting Burn, a […]

Butterley Spillway Improvements Works (2017)

Yorkshire Water’s Butterley Reservoir is located in the Wessenden Valley, West Yorkshire, with construction completed in 1906. The reservoir dam has a puddle clay core and a spillway constructed with local traditional stone. Due to fissures in the surrounding rock, leakages around the dam were experienced during the original commissioning phase, leading to a longer […]

Chantry Cottages Flood Defence Scheme (2017)

The £7.7m project to stabilise and improve 1km of flood defence embankment was initiated by the 2013 tidal surge. This caused widespread flooding to the east coast and raised water levels by over 1.5m in the Dutch River. Post-event inspection highlighted that this length of channel side was at high risk of failure and could […]

Foss Barrier (2017)

Built in 1987, the Foss Barrier forms an important part of the flood defences for the city of York. When a flood event is predicted, a mechanical gate can be closed to prevent rising waters in the River Ouse from backing up into the River Foss, preventing flooding to a large part of the city. […]

Springs Impounding Reservoir (2017)

United Utilities (UU) is the statutory undertaker for 132 impounding reservoirs (IRs) retained by earth-fill embankment dams which fall under the requirements of the 1975 Reservoir Act. Before the era of ‘Pennine’ type clay core construction techniques, many impounding reservoirs that were constructed around the turn of the nineteenth century were substantially homogenous, comprising of […]

Town Beck (Ulverston) Flood Alleviation Scheme (2017)

Centrally positioned within the South Lakeland peninsula and on the border of the Lake District National Park, Ulverston is a busy Cumbrian market town with a population of around 12,000 people. The town is arguably most famous as being the birthplace of Stan Laurel, one half of the legendary comedy duo ‘Laurel & Hardy’, to […]

Grafham WTW Resilience (2016)

Grafham WTW is located near Huntingdon and serves a population of 829,000, including Northampton, Huntingdon and Bedford. It is estimated that approximately 614,000 of these would be affected by a major outage at Grafham WTW. As part of Anglian Water’s AMP5 Final Business Plan programme, the Grafham WTW Resilience scheme was identified to mitigate the […]

Jackson’s Edge Service Reservoir - Compartment 1 (2016)

Jackson’s Edge Service Reservoir (SR) is a water supply scheme that will provide increased security to the network through the provision of a new 18Ml capacity, twin compartment SR on the site of the existing 103 year old SR. The £7.5m project has adopted a Design for Manufacture and Assembly (DfMA) approach, saving approximately £2m […]

What we do:

Contractors: Civils | Ground Engineering | Pipeline | Shaft Sinking | Structural Steelwork | Tier 1 | Tunnelling

Designers: Civils Design | Digital Twin | Electrical Design | Mechanical Design | Pipeline Design | Precast Concrete Tank Design | Shaft Design | Structural Design | Temporary Works Design | Tunnel Design | Wastewater Treatment Design | Water Treatment Design

Flood Alleviation: Contractors | Civil Engineering | Tier 1 Contractors

Renewables & Energy Management: Battery Energy Storage | Contractors | Civil Engineering | Tier 1 Contractors

Reservoirs & Storage: Contractors | Civil Engineering | Tier 1 Contractors

River Work: Civil Engineering

Sewerage: Contractors | Auger Boring | Directional Drilling | Marine | Micro-tunnelling | Open Cut | Pipe Jacking | Pipe Ploughing | Pipe Reaming | Tier 1 Contractors | Timber Headings | Tunnelling | Tunnelling | Shafts | Shaft Design | Shaft Sinking | Tunnel Design | Tunnelling Contractors

Site Preparation: Cofferdams | Dewatering | Ground & Slope Stabilisation | Groundworks & Earthworks

Stormwater Storage: Contractors | Civil Engineering | Storage Shafts | Shaft Design | Shaft Sinking | Storage Tunnels | Tunnel Design | Tunnelling Contractors

Wastewater Pumping Stations: Contractors | Civil Engineering | Tier 1 Contractors | Shafts | Shaft Sinking

Wastewater Treatment: Contractors | Civil Engineering

Water Mains: Contractors | Directional Drilling | Marine | Micro-Tunnelling | Open Cut | Pipe Jacking | Pipe Ploughing | Tier 1 Contractors | Tunnelling

Water Pumping Stations: Contractors | Civil Engineering

Water Treatment: Contractors | Civil Engineering | Tier 1 Contractors