You’re finally going forward with a project you’ve been planning for years: remodeling your outdated kitchen.

You’ve saved money, and you know you’ve got enough stashed away to pay for the job – or do you? A kitchen remodeling budget can quickly spiral out of control if you’re not careful.

“First of all, you’ve got to have a very clear plan, and you can’t deviate a lot,” says Hooper Patterson, an interior designer in Wilmington, North Carolina.

Remodeling magazine’s 2017 Cost vs. Value Report pegs the cost of a major kitchen remodel from $49,560 to $62,150 in a midrange house, estimating that homeowners recoup only 63 percent of that investment when they sell. Costs could exceed $100,000 in a high-end home. HomeAdvisor reports that most of its readers spent between $12,707 and $33,012 to remodel their kitchens. This is clearly not a job you want to mishandle.

If your kitchen budget is $20,000 and you end up spending $40,000 – or running out of money halfway through the job – you’re going to be in trouble.

[See: 12 Home Improvement Shortcuts That Are a Bad Idea.]

Sticking to your budget starts with planning, to make sure your budget is realistic. Toni Anderson of Orlando, Florida, has remodeled three kitchens and learned something new from each project. She has chronicled some of her remodeling adventures on her website, The Happy Housewife. She advises using Pinterest, Houzz or other tools to collect pictures of what you want months before you call contractors. Once you’ve got some ideas, start shopping both online and in the store to see how much your plans might cost. Use that information to refine your plans.

Kitchen remodeling costs more if you knock out walls and relocate plumbing, electricity and gas lines rather than simply replacing old cabinets and appliances. Plus, you don’t know what extra work you’ll reveal when you open walls and floors.

The crisis moments in the TV remodeling show where the contractor opens up a wall and finds an unexpected and expensive problem aren’t fiction. “Any time you relocate anything in your kitchen, you’re opening up the floodgates to cost,” Anderson says. “When you start opening up your walls, you discover other issues.”

In one kitchen remodel Anderson and her family did, she discovered pipes behind the sink that needed to be replaced and ended up tearing out the back wall of the house.

Your choice of materials can also affect labor costs. A large tile laid in rectangles is easier to install than small tiles that have to be laid in a specific pattern, and a tile setter is likely to charge accordingly. Replacing an electric stove with another of the same size costs considerably less than installing a gas stove, which requires adding a gas line. “The labor costs can change based on what you choose,” Anderson says.

You’re more likely to stick to your budget if you’re realistic going in about what you can afford. It’s easy to add upgrades here and there when you start shopping, and those small decisions can add up to big hits to your budget if you’re not careful.

[See: 6 Home Renovations You Think Will Pay Off – But Won't.]

“You yourself have to make sure you will stick to it,” Patterson says.

Here are six tips to help you stay on budget when remodeling your kitchen.

Sign a detailed contract. It’s important that a contract spell out exactly what’s included, both in parts and labor. If your contractor is going to supply the faucet, specify the brand and model number. Will the cabinets come with trim or handles? Does the new flooring include baseboards? You want to be very clear going in exactly what the contractor is responsible for and what you’ll have to buy or what work will incur extra charges.

Shop early. You can get great deals on kitchen fixtures, sinks, tile, handles and pulls and even cabinets online. But you need to shop early enough to allow for delivery and, in some cases, returns and exchanges. Even if you’re shopping locally, expect to have to wait for tile, cabinets, countertops and other materials to be delivered. Craigslist, Facebook and eBay could yield some bargains if you have time to wait for the right items to show up. Shopping for appliances before your remodel is smart because your appliances could affect some construction choices. “I love Overstock or Amazon for getting the look you want for less,” Anderson says.

Resist being dazzled in the showroom. When you go to shop for granite or stone for countertops, tile for backsplashes and floors or even appliances, you are bound to be drawn to materials that are significantly more expensive than what you have budgeted. Be prepared to resist temptation. “I think people can get sucked in by the bells and whistles, and you have to really stick to your budget on those items,” Patterson says. “If you have a clear vision of what really calls to you before you go to shop, you’re not going to get sucked in by all the bells and whistles.”

Don’t make last-minute changes. Rerouting plumbing or electrical lines is much easier when the walls are open than when they are closed. Changing flooring is much easier before cabinets are installed. Make a plan and stick to it. If you’re thinking about a change, ask how much extra work it will entail and how much it will cost.

[Read: 10 DIY Projects That Add Value to Your Home.]

Be mindful of small things. Drawer pulls may not appear to be a big-budget item. But if you choose pulls that are $10 each, 20 pulls will set you back $200. Cabinet pullouts, lighting fixtures, backsplash tile – all those things can be surprisingly expensive if you’re not a careful shopper.

Budget for surprises. It’s rare that you can do a remodeling project without running into unexpected costs. Make sure you have enough of a cushion in your budget that you can pay for emergency plumbing repairs or whatever other ugly surprise is lurking behind your walls or under your floors.

Tags: home improvements, home prices, housing market, real estate, personal finance, money

Teresa Mears writes about personal finance, real estate and retirement for U.S. News and other publications. She was previously the real estate blogger for MSN Money and worked as the Home & Design editor for The Miami Herald. During her journalism career, she worked on coverage of immigration, religion, national and international news and local news, serving on the staffs of The Miami Herald, The Los Angeles Times and the St. Petersburg Times. She has also been a contributor for The New York Times and The Boston Globe, among other publications. She publishes Living on the Cheap and Miami on the Cheap. Follow her on Twitter @TeresaMears.

Recommended Articles

Why You Should Sell Your Home in 2019

Devon Thorsby | Dec. 14, 2018

Housing markets may not be as hot as previous years, but selling now could be your best bet.

The Best Apps for House Hunting

Devon Thorsby | Dec. 12, 2018

These apps will have you scrolling and swiping listings to your heart’s content.

Curb Appeal Tricks to Attract Homebuyers

Sally Forster Jones | Dec. 11, 2018

These simple home improvement projects will have people excited to tour your home.

Housing Market Expectations in 2019

Devon Thorsby | Dec. 7, 2018

Changes in mortgage rates may cause homebuyers and sellers to hesitate about jumping into the market, while renters benefit from higher homeownership rates.

5 Smart Home Tech Options for Your Home

Sally Forster Jones | Dec. 7, 2018

Whether you're looking for yourself or your loved ones, this gift guide for household tech tools will elevate any home in the new year.

Why Renovating Is Better Than Selling

Devon Thorsby | Dec. 5, 2018

Using your savings to improve your current home may pay off more than buying a new house.

How to Make Moving In Together a Success

Devon Thorsby | Nov. 30, 2018

How to navigate splitting chores, paring down belongings and your significant other's bad taste in decor.

Reasons Not to Buy Your House With Cash

Devon Thorsby | Nov. 30, 2018

Before you go all-in with your money, consider these caveats to paying for a home with cash.

Will Interest Rates Changes Home Sales?

Ryan Fitzgerald | Nov. 29, 2018

The decision to sell your house or buy a new one shouldn't be dictated solely by changes in interest rates.

Home Inspection Checklist

Maryalene LaPonsie | Nov. 28, 2018

Learn what to expect from an inspection and tips to make sure your inspector doesn't overlook defects.

Your Guide to HOAs

Devon Thorsby | Nov. 28, 2018

Before you buy a house that's part of a homeowners association, know the basics and what to look out for.

At-Home 2019 Resolutions to Start Now

Devon Thorsby | Nov. 21, 2018

Don't wait until the ball drops to start on these projects.

Rent-to-Own 101

Geoff Williams | Nov. 20, 2018

Before using a rent-to-own arrangement to finance your home, carefully review the terms of the contract.

The Best Time for Home Improvement

Devon Thorsby | Nov. 16, 2018

Plan your year around the ideal seasons for scheduling, outdoor work and the best finished product.

How to Combat Neighborhood Displacement

Devon Thorsby | Nov. 14, 2018

Fight being forced from your community by becoming a more active member in it.

How to Become a Real Estate Agent

Devon Thorsby | Nov. 9, 2018

Follow these steps to start on the path to being a successful real estate agent.

Avoid These Winter Home-Selling Mistakes

Devon Thorsby | Nov. 7, 2018

Keep these tips in mind to avoid making your home sale more difficult.

Winter Home Prep Tasks You've Missed

Devon Thorsby | Nov. 2, 2018

Take these extra steps you may have missed to gear up for the coldest months of the year.

Do Home Value Estimate Tools Work?

Teresa Mears, Devon Thorsby | Nov. 1, 2018

Homeowners now have more control over how home value estimates are calculated.

Design Trends to Look Out for in 2019

Devon Thorsby | Oct. 26, 2018

Which decor fads are on their way in, and which ones should you ditch in the coming year?