8 Common Bathroom Renovation Mistakes to Avoid

A bathroom renovation can turn an outdated space into a more comfortable, functional, and visually appealing part of your home. However, rushed decisions, unclear budgets, and overlooked details can quickly lead to costly setbacks. Knowing the most common mistakes before work begins helps you make confident choices at every stage. 

For professional guidance with a bathroom renovation in Burlington, homeowners can turn to Running Renos. With more than 2 decades of experience, the licensed and insured team combines skilledcraftsmanship with honest communication and transparent planning. Here are eight bathroom renovation mistakes to avoid for a smoother project and a space that better suits your needs.

1. Starting Without a Realistic Budget

Many home renovation projects start out with figures culled from magazines or anecdotes from friends. Soon enough, the walls are open and the figures start to shift. Old houses in mature Burlington neighborhoods always have older plumbing, rotted sub-floors or damaged wiring which doesn’t get reflected in the estimate.

The fix: Establish a budget and leave 10 to 15 percent for contingencies. Always have your estimates itemized so that you know what the funds are going into. Understanding the main factors behind bathroom renovation costs in Burlington, such as scope, materials, and the age of your home, makes it much easier to build a realistic budget. Not setting aside enough in contingencies is the most common reason for having to scale back finishes mid-project. 

2. Treating Ventilation as an Afterthought

Moisture is very common from the bathrooms. The absence of a proper fan in such bathrooms causes the moisture to penetrate into the walls, paint, and the grouting. This can result into peeling of paint, growth of molds, and a musty odor that cannot be eliminated through cleaning. The condition worsens during winter season in Burlington since there is little ventilation due to closed windows.

The fix: Get a fan that will fit the room and vent it out externally, and never into the attic. It should be one which is noiseless so that it is used frequently. Humidity sensing device that controls the fan is an additional cost but worth it. Also, look at the duct work where it is important to get a proper duct system.

3. Cutting Corners on Waterproofing

Water is patient. A shower with a poor membrane, bad slope or sloppy seams can leak for years before anyone notices. By then the damage had reached the framing. Tile does not stop water. It only covers the surface.

The fix: Insist on a proper waterproofing system behind and beneath the tile, with correct slope toward the drain. Ask your contractor what product they use and how they test it. A flood test before tiling takes a day and can prevent a very expensive repair.

4. Moving Plumbing Without Planning for It

While moving a toilet or shower drainage seems an easy job in a picture, it might involve opening up floors or running new plumbing lines around the floor joists. People who become in love with the new layout only know about the expense later. Moving such plumbing lines may require a building permit from the City of Burlington, so it would be best to find out beforehand.

The Fix: Unless your new layout will give you some obvious advantage, keep plumbing fixtures right where they are located now. However, should you decide to make any changes, request a price quote on a separate item. Determine whether it is worth the price. Layout decisions should be settled early in the planning stage, well before demolition and ordering begin. 

5. Picking Tile That Looks Great and Performs Badly

A shiny floor tile is perfect for the showroom display. A wet tile can become slippery to walk on. Small mosaic floors have the problem of too many grout joints that need much effort to clean. The dark tile is prone to water stains, and light grout stains easily.

The Fix: Always check the slip rating of the tile which needs to be used for the floors or the showers. Use matte or textured tiles for the wet surfaces. Always use large tiles as few grout joints are easy to maintain. Always select the grout color similar to the tile.

6. Ignoring Lighting and Storage

Many people spend weeks choosing tile and a few minutes choosing lights. One ceiling fixture leaves shadows on your face at the mirror, which makes shaving and makeup harder. Storage gets the same treatment. The room looks clean on day one, then towels, bottles and hair tools pile up on every surface.

The fix: Plan light in layers. Use overhead light for general visibility, sconces or a lit mirror at face height, and a dimmer if you want a softer evening setting. For storage, add drawers in the vanity, a recessed shower niche and a wall cabinet before the framing is closed. These are cheap to build in and awkward to add later.

7. Hiring on Price Alone

The lowest quote is tempting. It is also the most likely to leave things out. A contractor who skips permits, uses unlicensed trades or cannot show past work puts your home at risk, and the savings vanish when something has to be redone.

The fix: Compare quotes line by line, not just by the total. Ask for proof of insurance and licensing, look at completed projects and call a couple of references. Before you sign, ask each contractor about licensing, insurance, warranty terms, and who will handle each trade. 

8. Ordering Late and Changing Plans Midway

Vanities, glass and special items can require several weeks for delivery. If the crew is ready but the tub isn't, then the job gets delayed. A change of mind midway through construction is no less expensive. A change in tile size or a change in the design of the shower could cost money in terms of additional labor.

The fix: Plan a stress-free bathroom renovation by making all choices before any demolition takes place and ordering long-lead items early. Measure everything on delivery, not on installation day. Agree in advance how any changes will be billed, since a simple change order process keeps minor modifications from turning into big bills. A shared selection sheet with model numbers and delivery dates also helps keep everyone on the same page. 

Why Burlington Homeowners Face Unique Renovation Challenges

Bathroom remodeling in Burlington is governed by a number of layers of legislation. Remodeling must comply with the 2024 Ontario Building Code, which has been used in permit applications since April 1, 2025. Electrical work needs to be approved by the Electrical Safety Authority and the 2024 Ontario Electrical Safety Code, and therefore, there is more than one layer of approval involved in one remodeling project. Climate conditions bring an additional challenge, because the steam from hot showers and cold exterior walls and windows cause condensation, mold, and peeling paint in the Ontario winters. There are also numerous Burlington houses constructed in the 1950s-1970s that have old plumbing systems, wiring, and small space that cannot be properly evaluated without removing the walls. This information is important in planning of a renovation in advance in order to avoid problems listed above. 

Bonus Tips for Burlington Bathroom Renovations

• Confirm permit requirements first: 

Contact the City of Burlington Building Department at 905-335-7731 or buildingpermits@burlington.ca before demolition. Moving fixtures, changing plumbing lines, or altering walls generally requires a permit.

• Book contractors early: 

  Spring and summer are the busiest seasons for renovation trades. Reserving a start date several weeks ahead is more reliable than waiting for a specific season.

  
  

• Order materials before work begins: 

  Fixtures, vanities, and tile can have long lead times, and metal-based products are exposed to tariff-related price changes. Confirm in writing how long each quote remains valid.

  
  

• Inspect older homes before pricing: 

  Homes from the 1950s to the 1970s may contain galvanized pipes, outdated wiring, or hidden moisture damage. An early inspection gives a more accurate budget.

  
  

• Keep a 15 to 20 percent contingency: 

  Hidden conditions behind walls and under floors are the most common source of unplanned costs.

  
  

• Plan ventilation as part of the layout: 

  Select a correctly sized fan, duct it to the exterior, and keep the outlet at least 1,800 mm (6 feet) from air intakes and vented soffits.

  
  

• Use licensed trades for regulated work: 

  Plumbing requires a licensed plumber, and electrical work should be completed by a Licensed Electrical Contractor under ESA oversight.

  
  

• Check condominium rules: 

  Condo owners should expect board approval, noise limits, work-hour restrictions, and elevator bookings before any work starts.

  
  

• Ask about flood protection for basement bathrooms: 

  Burlington has offered permit fee support for eligible basement flood prevention work. Confirm current availability on burlington.ca before relying on it.

  
  

• Request everything in writing: 

  The contract should state the scope, materials, payment schedule, start date, completion date, and how changes and hidden damage will be priced.

Make Your Bathroom Renovation Easier with Running Renos

Most of these mistakes come down to the same thing. People rush the planning and then try to fix problems once the work is underway. A bathroom is one of the hardest rooms to repair after the fact because everything is tied together behind the walls.

Slow down at the start. Settle the budget, the layout and the materials, and make sure ventilation and waterproofing get proper attention. Then the build itself goes quietly, which is exactly what you want.

A quick self-check helps before you sign anything. Can you state the budget, the layout, the waterproofing method and the delivery dates in one sentence each? If not, the plan is not ready yet.

If you would like a second opinion on your plans or a clear scope and price, get in touch with Running Renos. We will walk through your space, flag any concerns and give you an honest picture of what the job involves.

FAQs

1. How can I avoid unexpected bathroom renovation costs?

A contingency of 15 to 20 percent should be set, ask for a written estimate, and get the contractor to examine for any hidden problems like plumbing and wiring problems before quoting the job. Finishing off fixtures and finishes before demolition will prevent any change orders. For homeowners who want a quote on their project, they can call Running Renos.

2. How do I choose a reliable bathroom renovation contractor?

Ensure that liability insurance and WSIB coverage, licensed trade contractors for plumbing and electric installation, and references from the area including pictures of previous work completed bathrooms are confirmed. The written contract should include the extent of work, the materials to be used, the payment structure, the starting date, and the completion date.

3. What should be included in a bathroom renovation quote?

The full quote will show the items of demolition and disposal, plumbing, electrical, waterproofing, tiling, fixtures, labor, and permit fees separately. It will also include allowances for materials to be chosen at a later stage and the project dates.

4. Do I need a permit for a bathroom renovation in Ontario?

A permit will most likely be needed where there is the need for the movement of fixtures, changes in piping, changes in walls, or adding a bathroom. If you are replacing the same fixtures at the same location, you probably won’t require a permit, while any electrical works are monitored separately by the Electrical Safety Authority.

5. How long does a bathroom renovation usually take?

A typical remodeling project for an average size bathroom normally lasts anywhere between two to four weeks of on site activity. Changes in layout, special materials used, or concealed damage may prolong the process to four to six weeks or even more. Running Renos reviews the scope with you and gives a realistic timeline before work starts. 

6. What happens if water damage is found during renovation? 

The work in that particular area stops to determine what is causing the moisture problem and then fix it. The damaged drywall, subfloor, or framing is stripped away, dried out, and replaced, as necessary. Any present mold is cleaned up. Running Renos puts together a written change order for the additional costs and time needed.

7. How can I prevent mould and water damage in my renovated bathroom?

Ensure that there is a continuous waterproof membrane installed in all wet spaces along with an exhaust fan which is properly sized and will vent outside. The fan should be run for around 20 minutes post-bathing or by means of a humidity sensor which will get rid of the moisture causing the mold growth.

8. Should I replace old plumbing during a bathroom renovation?

Yes, in most instances. It would definitely be much more expensive to change galvanized, lead, or even corroded pipes once your walls have been finished than to do it now that everything is still accessible. A licensed plumber can check the supply and drain lines, and Running Renos can arrange an inspection before the scope is finalized. Call 289-707-2055 or contact us to schedule one for your home. 

9. How do I compare bathroom renovation quotes?

Compare quotations on similar lines regarding scope, which will include material, grade of product, allowances, and inclusions like demolition, disposal, waterproofing, and permits. The major difference in prices is normally due to difference in inclusions, rather than the quality of work. Warranty terms and payment schedules should be compared too.