Contractor software for small builders and remodelers: estimates, change orders and CRM
Short answer: Contractor software for a small general contractor or remodeler should do three jobs well: track leads in a CRM, build estimates that turn into signed contracts, and price and sign change orders before the work is done. As of October 2026, Joist starts at $10 a month for simple estimates, Knowify from $99 a month, and Projul from $199 a month billed yearly. A custom tool fits when your estimating method or sales process does not match these products.
You're a small contractor or remodeler drowning in spreadsheets and texted change orders, and you want to know what software actually fixes that.
I'm Ranjit, and I run Blur Studio: 15+ years building software, 120 apps taken live, and clients who have gone on to raise $10M+. I build AI systems and processes that help businesses do a lot more with a lot less time. I also work differently from most of what else is out there, more on that further down this page. Say hello.
What should contractor software do for a remodeler?
A remodeler's work starts long before the first wall comes down. The software should cover each step from first call to final payment.
A CRM for contractors
A contractor CRM tracks every lead from first call to signed contract. It should record where each lead came from, the date of the site visit, the estimate sent and the next follow-up. A good one reminds you when an estimate has sat unanswered for a week. It also keeps a record of past clients, so you can ask them for repeat work and referrals.
Estimating software for contractors
Estimating software builds a price from line items, such as labor, materials, subcontractors and markup. Look for a cost catalog you can reuse, so a bathroom remodel starts from your last bathroom. The estimate should turn into a proposal the client can sign online. After signing, the same numbers should become the budget.
Change orders
A change order is a written, priced change to the agreed scope. The client adds a window or picks a pricier tile, and you send a change order before the work starts. The client signs it on their phone, and the new amount joins the contract and the next invoice. Software that makes this take two minutes means you stop doing extra work for free.
Invoices and payments
Remodelers often bill in stages, such as a deposit, a payment at rough-in and a final payment. The software should send each invoice from the contract and take card or bank payments. My guide to invoicing apps for contractors covers this part in more depth.
Which contractor software fits small builders, and what does it cost?
These prices come from each vendor's own pricing page as of October 2026. Check them again before you buy.
Joist
Joist is a simple estimate and invoice app. Basics is $10 a month with up to 5 documents a month. Pro is $17 a month with unlimited documents and client tracking. Change orders start on the Elite plan at $32 a month, which also adds sales reports. A newer Run plan adds job scheduling and is shown at an offer price of $70 a month, down from $100. Joist says annual plans get two months free. It also sells an AI receptionist add-on at $49 a month.
Knowify
Knowify is built for contractors who need estimates, contracts and job costing. Its Core plan is shown from $99 a month with one user. It includes estimates and proposals, fixed-price contracts, change orders, a CRM and a QuickBooks Online link. The Advanced plan is shown from $329 a month with 10 users. It adds cost-plus and time-and-materials contracts, job costing, project budgets, subcontracts and a client portal. Extra users cost $29 a month each.
Projul
Projul is a full system for residential contractors. Starter is $199 a month billed yearly, or $249 monthly, for up to 3 users. It includes lead management, estimating, invoicing and scheduling. Change orders and the full CRM start on Core at $399 a month billed yearly, or $529 monthly, for up to 10 users. Core+ at $599 a month billed yearly adds job costing, progress billing, a client portal and QuickBooks Online.
Larger systems
Buildertrend and JobTread are bigger systems with full project tools, such as schedules and daily logs. I compare them in my construction management software guide.
| Product | Starting price (Oct 2026) | Change orders from | Best fit |
|---|---|---|---|
| Joist | $10 a month | Elite, $32 a month | Solo contractors who need fast estimates |
| Knowify | From $99 a month, 1 user | Core | Small GCs who want job costing and QuickBooks |
| Projul | $199 a month billed yearly | Core, $399 a month billed yearly | Remodelers who want one system for sales and jobs |
How should a contractor choose?
Start with the step where you lose the most money today. Then test the tool on a real job.
- Rebuild your last estimate: Enter a recent job from your notes. If it takes more than an hour, the tool may not fit how you price.
- Send a test change order: Send one to your own phone. See how many taps it takes to sign and whether the new total reaches the invoice.
- Follow a lead: Add a lead, book a site visit and send an estimate. Check that the follow-up reminder shows up.
- Check your accounting link: Ask how estimates, invoices and costs reach your accounting tool.
- Count users at your real size: Price the plan for your office staff, lead carpenters and partners.
- Ask about leaving: Find out how you export clients, estimates and photos.
What rules apply to contracts signed in a client's home?
Many remodelers sign contracts at the client's kitchen table. The FTC's Cooling-Off Rule can apply to those sales. It gives the buyer until midnight of the third business day after the sale to cancel for a full refund. It covers sales of $25 or more made at the buyer's home. The seller must tell the buyer about this right at the time of sale and give two copies of a cancellation form. The buyer also gets a dated copy of the contract that explains the right to cancel.
The rule has limits. It does not cover sales made fully online or by phone. It also does not cover repairs or upkeep the buyer asked you to come and do, though extra items you sell on that visit can be covered. Many states add their own home improvement contract rules. So check your state's rules too, and make sure your contract template and e-signature flow include the right notices.
Which AI features help small contractors most?
AI helps most with the office work that piles up after a long day on site.
Estimates from site-visit notes
You walk the job, take photos and record a voice note. AI turns that into a draft estimate with line items from your own cost catalog. You check the quantities and the price, then send it. A quote generator built on your own prices does this well.
Change orders from the field
The lead carpenter records a quick note when the client asks for a change. AI drafts the change order with the added labor and materials. The office checks the price, and the client signs before work starts.
Lead follow-up and missed calls
AI can answer calls you miss while on a ladder, take the job details and book a site visit. It can also send polite follow-ups on estimates that have gone quiet. My guide to answering services for contractors compares human and AI options.
When does custom contractor software make sense?
Most small contractors should buy one of these tools. They are ready now, and you can test them for a monthly fee.
Custom software is worth a look in these cases.
- Your own estimating method: You price by assemblies, square footage or design packages that no product handles well.
- Design-build sales: You sell paid design phases, selections and allowances, and the standard tools force workarounds.
- Tools that don't connect: Leads sit in one app, estimates in a spreadsheet and invoices in accounting, and staff retype everything.
- A branded client experience: You want clients to approve selections, sign change orders and pay in one portal with your name on it.
Often the best answer is a small custom tool next to a product you already use. An estimating tool built on your cost data can feed a standard CRM and accounting system.
What mistakes do small contractors make when they pick software?
- Buying a tool built for a different billing model. A per-visit trade tool forced onto a project-based remodel does not track milestone payments or retainage well, and you end up fighting the software instead of using it.
- Agreeing to a change order by text and never writing it up properly. Verbal or text-message change orders are exactly where payment disputes start. Get it into the system the same day, with a price, before the work continues.
- Treating the software's default contract template as legal advice. Cooling-off and home-solicitation disclosure rules differ by state. A template is a starting point, not a substitute for your own lawyer checking it once.
- Switching tools mid-project. Every job history, photo and change order lives in the old system. Time a switch between projects, not in the middle of one.
How would Blur Studio approach a contractor build?
I start with your last two jobs, one that made money and one that did not. I trace each from first call to final payment. I look for lost leads, missed costs and unbilled changes. If one of the products above fixes them, I will tell you which one to try first. If no product fits, I build the part you need. That could be an estimating tool on your own prices, a change order flow your crew can use on site, or a CRM shaped around design-build sales. Your cost data and the code belong to your company, in your own accounts. I keep the software working after it launches.
Questions people ask
What is the best software for a small general contractor?
It depends on where you lose time and money. Joist suits solo contractors who mainly need estimates. Knowify suits small GCs who want job costing with QuickBooks, and Projul suits remodelers who want sales and jobs in one system.
What is the best CRM for contractors?
A good contractor CRM tracks leads, site visits, estimates and follow-ups, and keeps past clients for repeat work. Projul's Core plan and Knowify's Core plan both include a CRM along with estimates and change orders.
How much does estimating software for contractors cost?
As of October 2026, Joist starts at $10 a month and Knowify is shown from $99 a month. Projul starts at $199 a month billed yearly for up to 3 users.
Does contractor software handle change orders?
Most do on their mid-level plans. Joist adds change orders on its $32 Elite plan, and Knowify includes them on Core. Projul starts them on its Core plan at $399 a month billed yearly.
Does the Cooling-Off Rule apply to remodeling contracts?
The FTC rule gives buyers three business days to cancel many sales of $25 or more made in their home. A remodeling contract signed at the client's home may need a cancellation notice.
Can I use the same software for both small repairs and full remodels?
Most of the tools above can handle both, but check how each prices and schedules a quick repair versus a multi-month project before you commit, since the two often need different workflows inside the same tool.
Roughly what does this cost?
As a broad reference, fixes and finishes start at around $1,500, and new builds start higher, always a fixed price agreed in writing before I start, never an hourly rate. My AI app cost guide explains what actually drives a quote up or down.
Is my business too small for this?
No. Most of the owners I work with have no tech team at all, that is the whole point. If the smarter move is a cheap software subscription instead of custom software, I will tell you that on the first call, even though it means I do not get paid.