Porsche 991 Valuation: 29 used car listings analysed

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How much does the Porsche 991 depreciate?

Used Porsche 991

A used Porsche 991 (2017) model loses about £617 per month in value.


Factors that affect the depreciation of a Porsche 991:
- Mileage driven
- Maintenance
- Service history


Depreciation is an important part of calculating the total cost of owning a Porsche 991. In addition to the monthly depreciation of £617, you should also factor in fuel costs, road tax, insurance and maintenance (including tyres and car washes) to get the full monthly cost.

How much does a used Porsche 991 cost? Prices, ratings and depreciation by model year

How much does a used Porsche 991 cost? Prices, ratings and depreciation by model year

Model year

Price range*

Avg. Price

Median Mileage

Depreciation
(12 mth.)

Cars for sale

2018 Porsche 991

£77,983 - £89,995£83,65529,500 miles-< 10

2017 Porsche 991

£74,962 - £102,998£83,38127,000 miles-£7,400< 10

2016 Porsche 991

£62,980 - £84,780£74,12533,600 miles-< 10

2015 Porsche 991

£49,822 - £82,798£68,09544,000 miles-< 10

2014 Porsche 991

£61,599 - £71,395£66,49651,300 miles-< 10

*The 'Price range' column shows the prices at the 5th and 95th percentiles of cars in the current market

The data is based on the cars currently listed on AutoUncle

Comparison of Porsche 991 variants and prices

No market data available

Porsche 991 (model year 2017) - Price development for the last 2 months and price projection for the next 6 months (July 2026 - February 2027)

Monthly price data with average prices and price ranges

Month

Average market price

Lowest market price

Highest market price

Calculation method

2026 - July
£79,480
£73,800£85,160
Estimate
2026 - August
£72,080
£63,560£80,580
Estimate
2026 - October
£57,240
--
Forecast
2026 - November
£49,820
--
Forecast
2026 - December
£42,400
--
Forecast
2027 - January
£34,980
--
Forecast
2027 - February
£27,560
--
Forecast

All estimates and forecasts are based on actual market data

Average Monthly Depreciation

A summary of the past 12 and an estimation of the next 6 months.

Past 12 months

-£7,400

Next 6 months

-£44,520

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Expensive

Looking for information on a used Porsche 991?

Are you thinking of purchasing a used sports car? Look no further than the Porsche 991 - an excellent choice! AutoUncle features 11 avalable cars to choose from, each one collected from an online marketplace or dealership website.

What is the price range for a used Porsche 991?

Currently, the prices for a pre-owned Porsche 991 start at £56,000 and go up to £88,900.

A pre-owned Porsche 991 can cost different based on mainly five factors: the year, engine capacity and performance, fuel efficiency of the car, the car's mileage not to mention trim level.

For instance, a more recent model with lower mileage, or a luxury edition with a robust engine, usually garners a premium price than a car from an older model year, with higher mileage and no optional extras.

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What are the most popular fuel types for the Porsche 991?

The primary energy source for the Porsche 991 is petrol.

Think carefully about your driving practices before deciding on the suitable fuel type - we highly recommend this approach. How far do you tend to drive in a week? Are they mainly short trips, or do you often find yourself driving longer distances?

For shorter trips, electric cars, plug-in hybrids and petrol cars are great. For longer commutes, an electric car is often the best choice - especially with charging options at home or at work. If you have a daily commute over longer distances, a modern electric car can be a great choice - especially if you have access to charging at home or at work. In a few cases with long journeys and limited charging infrastructure, diesel can be a practical solution. Note that diesel engines with significant emissions have faced entry bans in cities across numerous countries.

In which different body variants are the Porsche 991 available?

The Porsche 991 is available in both coupe and cabriolet body styles, with the coupe being the more popular choice. The coupe as a body type prioritises style and sporty driving. Compared to a sedan or an SUV, the chassis tends to be tighter and stronger. This body type is mostly for people without children, who usually travel light. This style is often more expensive than equivalent sedan or hatchback sister models.

What is the price difference between different body types for Porsche 991?

Are there alternatives to Porsche 991?

The Porsche 991 has some competitors from the same segment.

Top competitors to the Porsche 991

  • BMW 420
  • Audi TT
  • Mazda MX5

With a current inventory of 1,491 available models on AutoUncle, the BMW 420 stands out as the top alternative to the Porsche 991. The BMW 420 has an average price tag of £18,198.

The Audi TT is another popular choice in this segment, with 949 cars for sale and an average price of £13,199. The Mazda MX5 comes in as the third most popular choice with an average sales price of £15,000 and 556 car for sale at the moment in the UK.

Looking for a more eco-friendly alternative?

Considering something greener than the Porsche 991? Check out these electric alternatives from the same segment::

Didn't find an electric car to your liking? Check out our extensive selection of electric cars here.

Used Porsche 991 by body type

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