A3 Guildford Closure: Major Dennis Roundabout Work Dates
Critical Infrastructure Work Begins This Weekend
Guildford drivers need to mark their calendars: the A3 will face significant disruption this weekend as National Highways undertakes essential maintenance on one of Surrey's busiest junctions. From 9pm Friday, August 21, through 6am Monday, August 24, the northbound A3 will close completely between Stoke and Dennis interchanges. The southbound carriageway will operate under a reduced 40mph speed limit during this period.
This isn't routine maintenance—the Dennis roundabout's concrete structure, now 45 years old, requires substantial repair work to ensure safety for the thousands of commuters, delivery drivers, and visitors who navigate this two-tier gyratory daily. The structure's bridge supports and bearings have deteriorated over decades, making these repairs vital to road safety and the wider transport network serving Guildford, Woking, Dorking, and surrounding areas.
National Highways has been tackling this project since May, with engineers working steadily through summer months. While an official diversion route hasn't been published yet, officials suggest it will mirror previous detours used during earlier phases. Drivers should expect congestion and plan journeys accordingly, allowing extra time for their commute.
What Local Businesses and Residents Should Expect
For those living and working in and around Guildford, this closure will touch many aspects of daily life. Commuters heading north will need to factor in significant additional travel time. Local businesses relying on quick access routes—from tradespeople like bathroom fitters and contractors conducting bathroom refurbishment projects across Surrey to delivery services—should schedule work carefully around the closure dates.
The impact extends beyond individual inconvenience. Businesses in Guildford town centre, while remaining operational, may experience quieter footfall as some customers delay visits or reroute shopping trips. However, National Highways emphasises that “Guildford remains open for business,” suggesting they're balancing essential infrastructure work with economic activity.
For residents in East Horsley and Horsley, the closure will likely push additional traffic through local roads as vehicles seek alternative routes. Community groups and local organisations may want to advise members about the disruption in advance. Those planning home improvements—including bathroom refurbishment work—should coordinate with contractors beforehand to ensure tradespeople can reach properties without excessive delays. Being proactive now prevents frustration later.
Planning Ahead: What You Need to Do Now
National Highways' clear message is straightforward: plan your journey in advance. If you regularly use the A3 northbound on Friday evening or Monday morning, consider alternatives or adjust your travel times. The overnight closures on August 24 and 25 will also affect both directions between Dennis and Stoke interchanges, so weekday commuters should stay informed.
Checking the National Highways website closer to the dates will provide confirmed diversion routes and real-time updates. Local news channels and traffic apps will offer live information during the closure period. If you're a business owner or contractor, communicate changes to clients and customers now—transparency prevents complaints and maintains goodwill.
For community leaders and local organisations, consider whether the closure affects planned events or activities. Bus routes serving the area may experience delays, potentially impacting residents without private transport. The broader message is that while these repairs are essential for long-term safety and infrastructure integrity, short-term disruption is unavoidable. By planning ahead and staying informed, Guildford residents and businesses can minimise inconvenience while supporting the maintenance of critical transport infrastructure that keeps Surrey connected and safe.
Source: Surrey A3 closure dates confirmed for major Guildford roundabout work
