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Rarely does it enhance buyers LTV. Deposit contributions are rare, as the help to buy equity scheme has taken over, and you need to put in your own contribution regardless.
Incentives such as stamp duty paid, free maintenance charge, upgrades to flooring, kitchens etc, don't enhance LTV, and as all incentives need to be disclosed via the solicitors in a CML (council of mortgage lenders) form, this can actually have a negative impact on LTV, the lenders may deduct the incentive value from the purchase price and use this as their 'true value', effectively increasing the amount of deposit that you need.
Mortgage lending is not as easy anymore, no self cert, no raising home improvement funds based on the end value LTV, lower salary multiples, less house builder trickery, second property stamp duty, new rules on 'consumer BTLs' if your keeping your main residential and letting it out, and house prices increasing, its not fun.
At least rates are silly cheap!
Although that does effectively happen through incentives offers by developers to enhance buyers ltv.