A Problem That Wouldn’t Go Away Michael had been managing an office building in Addlestone for nearly seven years, and he’d always taken pride in running what he considered one of the town’s better commercial properties. The three-storey building housed a mix of small businesses – a digital marketing agency, an insurance brokerage, a couple of recruitment firms, and a small café on the ground floor that kept everyone caffeinated. “I like to think of myself as a hands-on manager,” Michael says. “When there’s a problem, I deal with it. I don’t ignore things and hope they’ll go away.” But the problem that started developing in late autumn was different. It wasn’t something he could see or easily identify – it was something he could smell. And so could everyone else in the building. “It started subtly,” Michael recalls. “Maybe mid-October. A couple of people mentioned a slightly unpleasant odour in the ground floor lobby. Nothing dramatic, just a bit off. I assumed someone had tracked something in from outside, or maybe the bins needed emptying more frequently.” He arranged for additional cleaning, had the carpets professionally shampooed, and made sure the waste was collected more regularly. For a few days, it seemed to help. But then the smell returned, stronger than before. “By November, it was unmistakable,” Michael says, grimacing at the memory. “Sewage. That’s what it smelled like. Not all the time, but particularly after heavy rain. It would get so bad that people working on the ground floor were complaining they felt nauseous.” “It was a dream job at first,” Julie remembers. “We had a great team, reliable clients, and the warehouse itself seemed solid. But there was this one niggling issue that kept coming up – puddles in the yard after heavy rain.” Initially, Julie didn’t think much of it. A bit of standing water in a loading bay seemed like a minor inconvenience rather than a serious problem. But as the months passed and Britain’s weather became increasingly unpredictable, those puddles started turning into ponds. “Last October was the wake-up call,” Julie says, her expression serious. “We had three days of torrential rain, and the water in the main loading area was ankle-deep. Drivers were refusing to reverse their lorries up to the bay because they were worried about getting stuck. We had pallets of stock sitting on the warehouse floor that we couldn’t load because the area was flooded. I was losing business, and I knew I couldn’t keep making excuses to our clients.” The Search for Answers Michael’s first instinct was to call in his regular maintenance contractor – a local handyman who’d helped with various issues over the years. They checked the toilets, inspected all the visible plumbing, examined the external waste pipes, and even climbed onto the roof to check the soil vent pipes. Nothing seemed obviously wrong. “They couldn’t find anything,” Michael explains. “Everything looked fine on the surface. The drains were flowing, there were no visible leaks, the vents were clear. But the smell was getting worse, not better.” The situation was starting to affect his tenants seriously. The recruitment firm on the ground floor reported that candidates attending interviews were commenting on the unpleasant odour. The café owner, Tony, was particularly distressed. “Tony called me one morning in a right state,” Michael remembers. “He said, ‘Michael, I’ve got customers asking if there’s a problem with the drains. I’m running a food business here – I can’t have people thinking my café smells like sewage.’ I could hear the panic in his voice, and I didn’t blame him. His livelihood was at stake.” The insurance brokerage on the first floor gave Michael an ultimatum: fix the problem within the month, or they’d start looking for alternative premises when their lease came up for renewal. “That’s when I knew I was out of my depth,” Michael admits. “This wasn’t something I could fix with air fresheners and professional cleaning. Something was fundamentally wrong, and I needed proper expertise.” Bringing in the Specialists A colleague in property management recommended YourDrainExperts, mentioning they’d successfully dealt with a similar mysterious smell at an Egham office building the previous year. Michael called us that afternoon. “The woman I spoke to on the phone was reassuring,” Michael says. “She didn’t seem surprised by what I was describing at all. She said they’d dealt with plenty of cases where smells appear after rain, and that usually means there’s something going on underground. She suggested a CCTV drain survey to get to the bottom of it.” We arranged to attend Station Court the following week. Michael met our team in the car park, where we began identifying the building’s drainage access points. “I’d never actually thought about what was under the ground before,” Michael reflects. “You just assume it all works, don’t you? Out of sight, out of mind. But watching them prepare to send a camera down into the drains, I realized how little I actually knew about the building’s infrastructure.” The Truth Beneath the Surface Our engineers fed the CCTV camera into the drainage system through the main inspection chamber. Michael stood with them, watching the monitor as the camera navigated through the pipes. “At first, everything looked okay,” Michael remembers. “Just pipes doing what pipes do. But then the camera reached a section serving the ground floor, and you could see immediately that something wasn’t right.” The footage revealed a substantial build-up of congealed fats, oils, and food waste coating the inside of the pipes. The accumulation had created a thick, sticky layer that was reducing the pipe’s diameter significantly – not enough to cause a complete blockage, but enough to slow drainage and trap organic matter. “The engineer explained that this was probably coming from Tony’s café,” Michael says. “Not through any fault of his – it’s just what happens when you’ve got a commercial kitchen. Fats wash down the drains, cool in the pipes, and gradually build up over time. And