A review of 43 studies by Sidebottom et al found that gates reduce burglary rate for following reasons:
1. Gates provide a physical barrier that increases effort required to committ a crime.
2. Residents take responsibility for caring for the gates, increasing guardship and surveillance.
3. Gates increase residents' sense of territoriality
4. Offenders cannot claim that they thought this was a public space.
5. Gating prevents "broken windows" - indicates that the place is cared for.
6. May reduce rewards for crime - difficult to steal large objects.
7. Cost may be an issue for some people. Avg cost = £728, but benefits are £2.19 to £1.