Estimate your project's cost range

What this tool helps with

The Project Cost Range Estimator is a simple download you can use to organize your early budget. It is made for homeowners who want a realistic starting point before collecting bids. It can help you think through project size, scope, materials, labor, permits, site conditions, and the extra costs that often surprise people.

This tool is most useful for big projects where costs can vary a lot from one home, lot, and city to another. That includes full new home construction, second-story additions, room additions, structural wall changes, foundation work, major kitchen and whole-home remodels, and other projects that usually need a licensed, bonded and insured general contractor. It is not a quote, not a contract, and not professional construction, engineering, or legal advice.

• Build a rough budget range before you start calling contractors
• Compare a smaller scope versus a larger scope
• List the project details contractors will ask about
• Spot cost drivers like site access, structural changes, and finish level
• Set aside a contingency for hidden conditions and change orders
• Prepare for better conversations with licensed, bonded and insured pros

What kinds of costs it can help you estimate

A lot of homeowners look only at the visible construction work and miss the rest. This tool helps you break a project into parts so your budget is more complete. For example, a room addition is not just framing and drywall. It may also include design work, demolition, concrete, roofing tie-ins, windows, insulation, HVAC updates, electrical service, plumbing, finish materials, permit fees, and cleanup.

It also helps you think about the costs that change from house to house. Older homes may need code upgrades. Sloped lots can raise foundation costs. Tight access can increase labor time. Moving load-bearing walls, changing roof lines, or adding bathrooms usually costs more than people expect. If you are comparing options, the worksheet can show why two similar ideas may land in very different price ranges.

These are broad national estimates, not quotes or guarantees. In some markets and for high-end work, costs can be much higher. In other areas, simple projects may come in lower. The goal of the tool is not to predict your exact number. It is to help you build a reasonable range so you can plan your next step.

How to use the estimator

Start with the basic facts. Write down what you want to build or change, the rough size, and the parts of the home affected. If you do not know the exact square footage yet, use your best estimate. Then mark the finish level you are aiming for, such as basic, mid-range, or higher-end. This alone can change the budget a lot.

Next, work through the checklist line by line. Add items for structural work, utility changes, windows and doors, roofing, flooring, cabinetry, fixtures, appliances, permit fees, and labor. Include outside conditions too. Ask yourself if there is difficult site access, old wiring, foundation concerns, water damage, or other unknowns. If the answer might be yes, give yourself room in the budget.

• Step 1: define the project in one sentence
• Step 2: estimate size, layout changes, and rooms involved
• Step 3: choose a finish level and note must-haves versus nice-to-haves
• Step 4: add line items for major trades, materials, permits, and cleanup
• Step 5: add a contingency for unknowns, often 10% to 20% for older homes or complex remodels
• Step 6: review the low and high end of your range before requesting bids

If English is not your first language, you can still use the worksheet as a clear planning guide. Short notes are enough. Bring the completed tool when you speak with contractors so you can ask better questions and compare bids more clearly. You do not need perfect construction vocabulary to get started.

Download the free tool

Download the Project Cost Range Estimator and fill it out at your own pace. It is free. There is no cost to use Mainstay Builders to get matched when you are ready to talk with contractors. The tool is designed to be practical, easy to print, and easy to share with a spouse, family member, or anyone helping make project decisions.

Use it before your first contractor conversation, not after. That way, you have a starting budget range, a list of questions, and a clearer idea of what matters most to you. You can also use it to compare version A and version B of the same project, like a smaller addition now versus a larger one later.

What to do after you use it

Once you have a rough cost range, the next step is to talk with licensed, bonded and insured general contractors who handle your kind of project. Mainstay Builders is a free matching service. We connect homeowners with contractors for new builds, additions, structural work, and major renovations. We do not perform the work, set prices, or guarantee a result.

Bring your completed estimator when you request bids. It can help you explain your goals and compare proposals more fairly. Ask each contractor what is included, what is excluded, what permit responsibilities they handle, and what conditions could increase the price. Always verify the contractor's license, bond, insurance, and references yourself before signing a contract or paying a deposit.

• Use the tool to set a realistic starting budget
• Get matched with licensed, bonded and insured general contractors
• Share the same project notes with each contractor
• Compare scope, allowances, exclusions, and timeline assumptions
• Verify credentials directly with the right state or local sources before you choose

Why this approach can save time and stress

A rough budget range helps you make better decisions early. It can keep you from falling in love with a scope that is not realistic for your market or your home. It can also help you avoid the opposite problem: under-describing the project and getting incomplete bids that leave out important work.

Homeowners often tell us that writing things down made the process feel less confusing. A simple checklist can turn a vague idea into a project summary you can actually use. That does not remove every surprise, but it can make your contractor conversations more focused and more productive.