The version of a property side hustle that works around a job is land sourcing: finding a site that could get planning permission, and getting paid when it does. It is evening and weekend work, it needs no building site visits, and the research is done sitting down.
This post covers what the work actually is, the two rules that catch people out, and what to do in your first ten hours.
Why sourcing rather than buying
Buying property needs a deposit, a mortgage and a tolerance for void periods. Sourcing land needs research time and a letter. The value you create is information: knowing that a particular field, yard or building could carry houses, and that its owner does not know or has not tried.
You then get paid one of three ways — a fee for introducing the site, a share of the uplift when permission is granted and the land sells, or a stake in the scheme. The middle one is where most people starting out land, because it needs no capital from you.
The two rules that catch people out
Tax
There is a £1,000 trading allowance. If your gross trading income for a tax year goes over £1,000, you generally have to register for Self Assessment by 5 October following the end of that tax year. One sourcing fee will usually take you past it.
The government has announced that the Self Assessment reporting threshold for trading income will rise from £1,000 to £3,000 gross within this parliament, with a simpler online service for people in between. As of September 2026 that has not started, so the £1,000 threshold is the one that applies. HMRC’s Help for Hustles guidance sets out the current rules. Anything about how to hold the income — personally or through a company — is a question for an accountant.
Anti-money laundering registration
This is the one nobody mentions. If you introduce a buyer to a seller of land or property for a fee, HMRC generally treats that as estate agency work. You must register with HMRC for money laundering supervision before you carry on that business, and trading as an estate agency business without registering is a criminal offence. Residential agency work also means joining a government-approved redress scheme.
Buying a site for yourself, or partnering on one, is a different position from sourcing it for a third party for a fee. Work out which one you are doing before the first invoice, not after.
Check your employment contract first
Exclusivity clauses, outside business interests and conflict of interest terms are common, particularly if you work in finance, law, surveying or for a local authority. If you work for a council, anything touching its planning function needs declaring. Read the contract, and ask rather than assume.
The route with no capital at risk
The expensive part of getting a site from idea to value is the planning application: consultants, surveys, reports, and the application fee, spent months before you know the answer.
BOOM! Planning Partners funds 100% of those planning costs on a site you source and splits the uplift 50:50 when the site sells. If the application fails, the loss is theirs. That is the structure that makes this workable as a side hustle: your contribution is the site and the research, not a cheque.
Your first ten hours
- Pick one authority you can drive across in half an hour. One. Depth beats breadth and every local plan is different.
- Read its housing policies and find its settlement boundaries. Our post on how planners use settlement boundaries explains why that line decides most small applications.
- Pick one strategy. Infill plots, garden land, a barn conversion, a small brownfield yard. Not all four.
- Find twenty candidate sites that fit it, and write down for each one the reason the council could refuse.
- Take the best five to an owner. Our guide to approaching landowners directly covers what the letter should say and what it costs.
What to expect
Slowly, then not at all, then once. Most letters get no reply. Planning decisions take months and appeals take longer. The first deal is the slow one because you are learning the authority as you go; the second is faster because you already know what that council says yes to.
What it is not is passive income. It is a research skill you are building in the evenings, and the thing you are getting paid for is having looked properly when other people did not.
