Hiring a plumber to unclog a drain typically costs between $ πππ and $ πππ for standard fixtures, with major sewer line blockages ranging from $ πππ to $ πππ or more. The total price depends on the specific fixture, the severity of the blockage, and the cleaning method required.
The average cost to unclog a drain ranges from $100 to $300 for standard household fixtures like sinks, showers, and toilets. Deep main sewer line blockages or tough clogs requiring advanced clearing methods can raise the price to between $450 and $1,000+.
The easiest, most reliable DIY method to clear a main sewer blockage is using a sewer bladder (drain flush bag). It attaches to your garden hose, expands inside the pipe, and uses high-pressure water to blast the clog downstream.
How to unclog a drain
A straightforward yet effective approach to addressing a clogged drain pipe involves simply using hot water mixed with dish soap. This method, ideal for tackling minor blockages, leverages the degreasing power of dish soap combined with the force of hot water to dislodge and dissolve clog-causing residue.
It's best to instead opt for a Drano alternative as a safer and more plumbing-friendly way to unclog your drains. Some of the best Drano alternatives include using a plunger or pipe snake, soap or salt mixed with boiling water, or baking soda and white vinegar.
Pouring salt down your drain at night is a popular DIY plumbing trick used for routine maintenance. The goal is to take advantage of the salt's coarse texture and natural moisture-absorbing properties.
The strongest chemical unblockers are professional-grade sulfuric or lye-based acids (e.g., Zep Sulfuric Acid Drain Opener), reserved for extreme emergencies. For everyday household clogs, commercial-strength gels like Drano Max Gel Commercial Line are highly effective and safer for pipes.
As the fall rains intensify and the seasons shift, one surprising tip is getting renewed attention: pouring vinegar down your drains to help prevent clogs.
Type of plumbing
On average, it takes a plumber 30 minutes to 2 hours to unclog a drain. The total duration is heavily influenced by the severity of the blockage, accessibility, and the specific method required.
Here are the most common causes of blocked drains:
Prices start from approximately Β£90 for straightforward manual unblocking to Β£275 for a complete CCTV drain assessment including a detailed report. Additional services such as high-pressure water jetting and drain relining are charged per service or per linear metre. Drain relining averages at Β£100 per linear metre.
The "135-degree rule" in plumbing states that the total (aggregate) horizontal change in direction for a drainage pipeβspecifically trap armsβcannot exceed 135 degrees between the P-trap and the vent. Exceeding 135 degrees (such as using three 45-degree bends or a 90 and two 45s) requires a cleanout because sharp turns hinder flow and cause clogs.
Depending on the severity of the problem, your sewer line could take anywhere from a half hour to 5 hours to be cleaned. A professional will come and talk to you about your issue. Then, they'll likely first try to resolve the problem with a drain clearing "auger" (a motorized snake-like tool that breaks apart clogs).
Best drain cleaners
Neither product is definitively better than the other because they have nearly identical chemical formulas. Both primarily rely on sodium hydroxide (lye) and bleach to dissolve organic clogs like hair and soap scum. However, most professional plumbers advise against using either product because the harsh chemicals can corrode metal pipes, damage plastic PVC, and destroy plumbing fixtures over time.
Baking soda and vinegar do not effectively unclog drains. Instead of clearing debris, mixing them chemically neutralizes both ingredients into salt water. The fizzing reaction is visually satisfying but largely escapes upwards, offering zero power to dissolve grease, hair, or stubborn sludge.
Plumbers highly recommend avoiding harsh chemical drain cleaners, as they can corrode pipes and only offer temporary relief. Instead, they suggest preventing buildup through daily habits, using natural enzyme or enzymatic cleaners for maintenance, and letting professional cleaners clear severe blockages.
Occasional, small amounts of salt are generally safe, especially when flushed with plenty of hot water to help break up grease and neutralize odors. However, frequent or excessive use of salt can corrode metal pipes, scratch fixtures, and contribute to long-term plumbing damage.
Dawn dish soap does not typically clog drains on its own; in fact, its powerful degreasing properties make it highly effective at clearing minor blockages caused by oils and soap scum. However, improper useβlike using too much soap without flushing completelyβcan leave a sticky film that traps debris.
A drain snake is almost always the better and safer choice. Plumbers and maintenance professionals widely recommend using a snake to physically hook and remove clogs because it resolves the blockage immediately without subjecting your pipes to harsh, corrosive chemicals that can cause serious damage or skin burns.
To protect your plumbing and the environment, you should never put fats, starches, harsh chemicals, or solid waste down your drains.