By Charlie Overs, Associate Director and Flood Resilience Lead, Dalcour Maclaren
Flood resilience schemes are among the most complex infrastructure projects to plan and deliver. Whilst they deliver many positives when complete, they cross land ownership boundaries, regulatory regimes, political priorities and community concerns, often simultaneously. When issues arise, the impact is rarely minor. Delays can quickly translate into rising costs, reputational damage and continued flood risk for the communities the scheme is meant to protect.
Drawing on my experience at Dalcour Maclaren (DM), alongside more than a century of combined team expertise in planning, consenting and delivering flood and coastal resilience projects for national and local authorities, here are the five areas that consistently determine whether a scheme progresses smoothly or stalls.
1. Get the overall strategy right before going into the detail
A common cause of delay is moving too quickly into technical design without first establishing a clear strategic framework.
It is essential to understand the full scope of a scheme from the outset, not just what needs to be built, but where, why and with whose agreement. That means mapping land interests, identifying constraints, engaging stakeholders, understanding regulatory pathways and stress-testing delivery options before designs are fixed.
On the River Itchen, a scheme we worked on in Southampton, the design team and stakeholders were brought together early to review high-level proposals. This allowed designers to understand barriers before commitments were finalised. Where issues could not be resolved through design changes, we advised on compensation and set clear expectations with both the client and landowners.
Early strategic alignment brings programme, land, consenting, access, stakeholder and risk considerations together. It helps identify pinch points, sequence work realistically and allocate resources appropriately, while reducing the risk of late-stage changes that drive up cost.
Time invested at this stage is rarely wasted as schemes that lack early strategic input often revisit key decisions later, resulting in avoidable delays and additional expense.
2. Treat consenting as an integrated process, not a checklist
Flood schemes sit within a dense web of regulatory requirements. Planning permission is only one element. Archaeology, ecology, heritage, environmental permits and flood risk activity permits must all be considered, often in parallel.
Problems arise when consenting is treated as a box-ticking exercise or left too late. Insufficient early detail, or failure to consider construction and reinstatement requirements can cause constraints to emerge at critical stages. Land access, protected species, heritage sensitivities or seasonal working restrictions can then become programme blockers.
An integrated consenting strategy aligns regulatory requirements with design development, contractor scope and milestones. Early surveys, dialogue with regulators and realistic programme assumptions significantly reduce the risk of unexpected delays.
Where constraints are identified early, schemes can adapt, adjusting alignments, re-phasing works or building mitigation into the design. Without that flexibility, projects often face reactive redesigns following late consultations, triggering additional land requirements, further surveys and increased costs.
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3. Put communication at the centre of delivery
Flood schemes affect a broad range of stakeholders: landowners, tenants, local authorities, statutory bodies, parish councils, elected members, community groups and residents. Misalignment, or decisions taken without the right voices consulted, is a frequent source of delay.
Effective communication requires structured engagement, clear messaging aligned to the strategy and clarity on who needs to be involved, when and how. Internally, this means ensuring project teams, consultants and contractors are aligned on objectives and constraints. Externally, it requires early engagement with affected landowners, careful management of indirectly affected parties and consistent dialogue with political and senior stakeholders.
The Canvey Island flood resilience scheme demonstrates this approach. Working alongside Jacobs, whose on-site stakeholder manager provided a consistent local presence, the team delivered newsletters and hosted drop-in sessions to keep residents informed. Social value initiatives supported local groups and businesses, reinforcing commitment to the community.
Joint engagement ensured unified messaging around compensation, land rights and access. This coordinated approach reduced uncertainty, built trust and helped maintain momentum.
Clear communication builds confidence, reduces objections and creates space to resolve concerns before they escalate.
4. Take a proactive, risk-based approach to land assembly
Land assembly is often the greatest risk to programme and cost certainty on flood schemes. Early identification of land interests allows teams to understand who is affected, what rights are required and where risks are concentrated. A risk-based approach helps prioritise engagement and inform design decisions before they become difficult to change.
Land assembly extends beyond acquisition. Temporary access, survey rights, construction easements and long-term maintenance arrangements must all be secured. Overlooking these requirements can lead to delays during construction or disputes later in the asset’s lifecycle.
Selecting the most appropriate statutory powers is a strategic decision that should align with the overall delivery strategy. The right approach balances programme certainty with constructive landowner engagement, reducing the likelihood of challenge.
The Oxford Flood Alleviation Scheme illustrates this. Close team integration, a clear risk-led strategy and proactive landowner engagement supported the Compulsory Purchase Order process and reduced objections.
5. Embed partnerships to remove barriers early
Flood schemes are long-term projects that benefit from continuity and collaboration. The most successful schemes embed specialist partners within the team from early strategy through to post-construction legacy.
Experienced suppliers can identify and address barriers early, whether clarifying land ownership, aligning consent requirements with design changes, or adapting engagement to local sensitivities. Addressing issues early prevents escalation into formal objections, programme delays or cost overruns.
Integrating land, planning, environmental and stakeholder expertise into the core team strengthens resilience and decision-making.
As climate pressures increase, flood resilience schemes will continue to play a critical role in protecting communities. Avoiding delays and unexpected costs is not about eliminating risk entirely, but about understanding it early and managing it effectively.
When strategy, land, consenting, construction and engagement are aligned from the outset, flood schemes are far better placed to deliver on time, on budget and with community confidence.
[Main image credit: shutterstock.com / PanuShot]