Create an arsenal of cleaning products that can clean almost every kind of product (paint, chalk, markers) from every kind of surface (cement, wood, pavement). The best way to conduct a graffiti service is to offer a subscription-like arrangement. Once a month or whatever interval makes sense for your clients, go around to their property and clean off the graffiti. Charge them a monthly or quarterly fee and make it simple for everyone--they don't have to think about graffiti, and you just do your job.
Like graphic design, Web design requires skills that can take years to acquire and perfect. But if you have them, the market is there for creating attractive, useful Web sites for all sorts of organizations. Starting a Web-design business does require some up-front investment, particularly in software, although candidates to start Web-design firms might have those applications already.
I have a friend that is the city manager of a town of about 25,000 where his main task is processing requests for building permits. Actually a volunteer-type job, no salary. But he makes a bunch of contacts every day, and his address book is huge. So he is busy all year except the Holidays. To fill in this time he started a Christmas tree lighting service (houses, lawn ornaments, etc.). In this 3-month period he makes enough to keep him going the rest of the year.
If you want to broaden your services and earn more, you can opt to make the entire house look neat and clean with this side business idea. House cleaning services cover carpets, floors, lawns, garages, windows, walls, and roofs, requiring a whole range of cleaning tools. You can hire maids and janitors to do the actual cleaning while you handle sales, administrative and customer service tasks. Or, you can start small by actually getting your hands dirty as a contractor, learning on the job before launching your own cleaning operations with the help of cleaning business management tools like Swept. Beyond that, I'd recommend checking out Cleaning Zoom's ultimate guide to starting a cleaning business if you plan on taking this business idea seriously.
Software drives businesses today. This is a fact not lost on individuals and companies attempting to earn a profit, make a name for themselves, or simply get things done. As a result, the job outlook for software developers will be much sunnier than prospects for many other occupations—creating massive opportunities for this business idea well into  the future. In fact, it won’t take you long to find a good-paying software development project as a side business idea on sites like Upwork, Guru.com, and Freelancer. LinkedIn also recently launched their brand new freelancing platform, ProFinder which has a dedicated section just for hiring talented software developers.
If you live near a university, there are likely all sorts of research studies looking for participants. While I was an undergrad at Virginia Tech, I got paid $500 to participate in a 6-week dietary study. The study provided all my meals and paid me, but I had to eat a 5,000 calorie diet of 50% fat for 6 weeks, plus I had multiple muscle biopsies, urine/blood testing, etc.
In an era of aging baby boomers and changing healthcare laws, medical coding and billing jobs offer relatively stable ways to make money from home. To qualify for medical coding jobs, you’ll need certification from one of the recognized national certification organizations. Inputting patient medical data, including doctors’ notes and diagnoses, with an extremely high degree of accuracy are the main tasks. Medical billing professionals primarily input and submit payment and insurance data relating to medical care and procedures.
You can work as a virtual assistant through dedicated websites, such as Upwork or Zirtual. All kinds of skills are needed, and compensation can vary anywhere between $10 per hour to $100 or more. Obviously, the higher pay will be to people who have more technical skills, such as web building skills and marketing. But you can find work doing administrative tasks at the lower end of the pay scale.
If you’re a top-notch editor with a deep understanding of how college admissions works—including standardized test preparation, personal statement requirements, supplemental essay requirements, applicant statistics, and even financial aid—then you might be able to snag a rather well-paying job as a college consultant. Some families are willing and able to pay through the nose to make sure their kids submit the best possible applications to their dream schools….
There are many things that you can do as a virtual assistant. You can manage the social media of a business, website, etc. (Facebook, Pinterest, Twitter, and everything else), handle the newsletter, work on the website, proofread and edit, do market research, handle emails, and so on. The list is really endless. Are you interested in becoming a virtual assistant? Don't forget to also read about what exactly a virtual assistant does.

2. SayABC-  This China-based school is looking for professionals and non-professionals. Although a bachelor degree is a requirement, they still accept individuals with relevant teaching experience a chance to show their skills even if they don’t have a bachelor degree. Perfect for stay-at-home parents and college students. Pay rate starts at $21 / 40-minute class.
Another idea someone could do from home is to start a service or write a software program that scours local ad listings (like craigslist) for a particular used item a person wants to buy. They have services like this for new items, but not used. I know others like me who are keeping their eye out for something used (like a canopy king bed!) but don’t have the time or inclination to search for it every day.
17. Amazon – Have you heard of FBA? It stands for “Fulfilled by Amazon” and it’s getting pretty popular. Basically, you buy products (in bulk is best) and ship them to Amazon for them to store. When your products sell, Amazon packs them up, ships them out and sends you the money (after taking their cut). There are people making a full-time living from FBA, while others just do it for some extra money.
Mentorship. With sites like Etsy, it simply doesn’t make sense to reinvent the wheel when opening a shop. Instead, look to others who have been down the path and have learned the hard way what to do – and what not to do. Blogs like Handmadeology and EverythingEtsy.com offer hints and guidance for artists just looking to get started in this profitable home-based business.
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs. 
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