The same methodologies apply, as Sean Ellis has said before growth hacking comes only when you have put thought into the whole customer experience.

I have been running marketing and strategic campaigns for almost a decade and I gotta tell you that growth hacking in offline, real world situations for service businesses or even product retail offerings comes only from aligning these 3 things:
1. Simplicity at its best
2. 100% fluff-free problem solving product
3. and ease of use
Complete thoughtfulness on the entire problem solving, choosing, and sharing experience.

With the help of my team at www.Unthink.me - I have been able to help many companies, especially those in service based businesses - such as travel agents, realtors, cleaning / janitorial cleaning companies, etc who struggle with growth and scalability due to time and budget limitations. These companies depend on a service, on point scheduling and well-positioned branding and offering so that their clients aren't the reason for ZERO growth.
What needs to happen for service based businesses for example, what I have done in the past, is align those 3 factors then break them into more categories adding value innovation to each and every single one of them for as little cost as possible.
In the case of Honest Maids for example, www.HonestMaids.co, I was able to stake a market, figure out the branding that was needed, position the company within the entrepreneurial and enterprise community to reach their homes. The pricing, the value proposition, everything was simplified and on-site the team, the experience, the products they are all different - this drove their clients to give referrals, call backs, sign up for contracts, add more properties, airbnb endorsement, amazon endorsements, partnerships with a few universities... etc. etc. - now the company is in various states and we're now helping/trying to franchise it.

The problem with growht hacking is that it grew so fast, the idea was innovative. But when we started the mentality wasn't to promote "free marketing" but unfortunately it has become synonymous with free. In reality, growth hacking is simply finding creative solutions and process to enable the greatest possible experience while putting a strong focus on encouraging social validation and sharing - sometimes growth hacking is very expensive and sometimes it's not. But it's typically not free. If you have any more direct questions regarding this, feel free to message me.
Humberto Valle, MBA, CEO
humberto@unthink.me
www.Unthink.me