Top 5 Mistakes People Make When Starting Groundworks (And How to Avoid Them)
Getting groundworks right is essential to the success of any construction project. It’s not just about digging and pouring concrete — it’s the foundation (literally) that everything else relies on. But too often, mistakes happen early on that cause delays, increase costs, or compromise the quality of the final build.
Here are the top 5 mistakes we see people make when starting groundworks — and how to avoid them.
1. Skipping a Proper Site Survey
One of the biggest mistakes is jumping straight in without a thorough site investigation. Ground conditions can vary massively — from soft clay to solid chalk — and this affects everything from drainage to foundation depth.
Avoid it by:
Always start with a professional site survey to understand soil conditions, underground services, and potential obstructions.
2. Underestimating Drainage Requirements
Water management is crucial, especially in areas with heavy rainfall or clay-heavy ground. Poor drainage can lead to waterlogging, subsidence, or long-term damage to foundations.
Avoid it by:
Including drainage design as part of your groundwork plan. Permeable materials, soakaways, and proper pipe layouts can prevent future headaches.
3. Using the Wrong Type or Amount of Aggregate
Using unsuitable aggregates for sub-bases or over/under-ordering materials can waste time and money. For example, Type 1 MOT is ideal for stability, while sharp sand is often used for laying slabs or blocks.
Avoid it by:
Consulting with your supplier or contractor about the right materials for your project. Always order with a little buffer to cover minor miscalculations.
4. Not Preparing for Access and Clearance
Tight sites, overgrown vegetation, or poor access for lorries and diggers can delay work or make it impossible to start.
Avoid it by:
Clearing the site in advance and ensuring there’s enough access for machinery and deliveries. Plan for waste removal as part of your schedule.
5. Choosing the Cheapest Quote Without Checking Credentials
Groundworks need to be precise, compliant, and safe. Cutting corners by picking the cheapest quote can backfire if the work isn’t done correctly or to spec.
Avoid it by:
Checking accreditations, previous work, and insurance before hiring a groundworks contractor. Make sure you're comparing like-for-like services.
Need Expert Help with Your Groundworks?
At Kernahans Contractors, we offer complete groundworks services across Kent — from initial site clearance and excavation to foundation installation and drainage. Whether you’re building a new home or preparing for an extension, we bring the experience, equipment, and materials to get it right from day one.
➡️ Learn more about our groundworks services
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