Hi Will here
for me the best way is first off good content, you will find that when your dealing with plumbers, plasterers and builders getting links from guest blogging, infographics and giveaways is not practical.
here is what i would do for a local company
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Join all the industry forums and start talking getting involved with your clients community
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Start doing some keyword research into your clients business, ie plasterers, Rendering, Machine plastering ect
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Start Creating content on this ie "how to Render a wall" , "how to plaster a wall"
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For every job your client does locally write a blog post, ie "Plastering Job Glasgow"
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Start Following other local tradesman or services like your clients business
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Tweet your client work to other tradesmen or like wise service
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Join all the local services directories that are related to your niche
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Make sure your business address matches across directories you join,
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Create a google business plus account,
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Create a nice A5 Flyer offers something a small discount on your clients jobs in return for a honest review of your services
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Join Facebook and do the same, if a customer leaves a review give them a little discount
This is just some of my tips
Also one last tip
If for example your client is a local service for example "plumbing" company and your in Manchester. Then try find a area thats more competive than your area, ie London. Complete a few searches ie Plumbing London, plumbers in London, then complete the following
Check their backlinks
Check their google plus profile
Check their sites onsite
This should give you an idea of their strategies, as sometimes when looking at your competition in your own backyard can distract you.