Shared ownership flat "owner" here, coming up to 4 years now and it has been both heaven and hell. Especially with new build quality having the reputation it has and who's responsibility it is to maintain the property.
On the estate I am on the price of a 1 bedroom flat was 8x my salary, the rental rate more than 40% of my salary. The combined mortgage and shared ownership rent even with a 60% share worked out at 30% so it was more affordable than renting.
I went down this route as a "reset", I needed my own space and the internal size was perfect for my needs. My mortgage advisor said I could have aimed bigger. Instead my plan was to staircase to own the property outright and then consider selling in the future so I had a fixed 3 year mortgage on 2% with a plan to re-mortgage to buy the rest.
One of the important figures to watch for is the rental percentage rate and how it escalates. Mine was on the high side at 3.5% of the shared property value, but they had undervalued the property when it was first sold so the rent was reasonable. Newer builds have a higher purchase price but the rent rate is only 2.75%. This value doesn't change with the price of the property but with RPI+%, so this year our rent went up 8%. Run the maths and see if it's affordable, how much buffer do you have if prices increase and how would it compare to properties on the open market. When I tried to re-mortgage to buy out the staircase I was getting quotes of 5%+ so it worked out cheaper to overpay my existing mortgage to rock bottom and stay with the shared rent than it was to staircase and take on more debt, with a plan to buy the rest when rates or values stabilise.
If I hadn't gone down the shared ownership route it would have taken an extra 2 years to save up enough deposit and salary bump to be able to afford a much older, smaller flat with a higher mortgage, if I had been 2 years earlier I could have had a 2 bed terrace.
As above, here are some of my points:
* You are responsible for any maintenance or repairs of anything after the structure of the property just like a normal house, including leaks, servicing and damage.
* Your freeholder is "responsible" for repairs and maintenance of the rest of the property, as in they will repair when instructed, but they will apply this repair charge to your maintenance contract. If the gutter falls off, they repair it, the cost gets added on to the maintenance contract and comes out of your service fees. They do not pay for anything.
* Shared ownership properties as they are not "open market" usually have inferior fixtures and fittings compared to the "showhome" developer properties to cut costs such as less tiling, cheaper finishes, kitchen/bathroom etc. The two bedroom flat on our estate the shared ownership property got a walk in wardrobe instead of an en-suite.
* If you're only planning on being there as a starter home, don't staircase. Your property is worth more as a shared ownership than it is as a fully owned flat, as you are finding out the affordability of shared ownership is better than rented or owning fully outright. Two flats here recently went on the market for the same price, the shared ownership one sold within a week and had half a dozen viewings, the private sale had more viewings but after 3 months was pulled from the market as no one would buy it, even though it was the same price and had a better kitchen/bathroom.
* If it's a new build, get a professional snagger in to inspect it when you move in. After 3 years I'm still heavily involved (multiple calls a week) with the Housing Association (freeholder/management), builder, NHBC, Building Control, an acoustics engineer, plumber, another builder, glazing fitters, council, housing ombudsman, another acoustics department and soon to be a solicitor because the house was inappropriately signed off as complete when it doesn't conform to building regulations. (similar situation to cladding, but noise related rather than fire risk). All very keen to blame each other and no one will take responsibility.
* Your share value is linked to property prices, same with staircasing, but the rent is fixed plus RPI on the original sale price. My flat has gone up in value 25% but the rent 10% in 3 years. To staircase I'd have to mortgage the extra increase in value.
I've looked at moving out, but with my funds I can either afford a 2 bedroom flat outright in a worse block, or a 2 bed semi shared ownership on the outskirts of town with smaller rooms. Overall I don't regret going down the shared ownership route but I'm sure housing would be more affordable for all if they didn't keep running schemes to try and make property "affordable".