Right - I earn pretty much the same as you.
Here are my actual costs to live in a 3 bed semi. I've taken off childcare costs and my husband's income as these are irrelevant to your situation.
This is the level of detail you need to go into.
My budget for what I thought I was spending looked pretty much like yours (i.e. underestimated my expenditure to a crazy degree - I buy kids clothes second hand and had written that I thought I would spend £100/child per year for clothes, it was actually £400). I was shocked to see what I was actually spending when I sat down and worked it out.
Please do not exchange contracts until you have seen your ACTUAL expenditure for the past 1 year with every single transaction documented.
If you proceed without doing this work, I wouldn't be surprised if your house is repossessed within 2-3 years. Based on all that I am seeing, you cannot afford this house and need to pull out.
Income
- Salary (take-home): £51,993 / £4,333 per month
- Child benefit (take home): £1,111 / £93 per month
Expenses
General Expenses
- Home repairs/improvement: £3,241 / £270 per month
- Holidays (all costs inc. travel/accommodation/Passports/insurance/eating out etc.): £2,896 / £241 per month
- Presents/parties: £1,251 / £104 per month
- Home items: £1,224 / £102 per month
- Christmas: £1,132 / £94 per month
- Personal spending (clothes/prescriptions etc for adults): £1,115 / £93 per month
- Emergency: £701 / £58 per month
- Eating out: £666 / £56 per month
- Food: £7,846 / £654 per month
- Health: £627 / £52 per month
- Work lunches: £510 / £43 per month
- Adult time/babysitting: £500 / £42 per month
- Days out: £368 / £31 per month
- Miscellaneous: £75 / £6 per month
- Takeaways: £54 / £4.50 per month
- Unknown: £28 / £2.33 per month
Bills
- Mortgage: £9432/ £786 per month
- Council tax: £2,093 / £174 per month
- Gas/electricity: £1,979 / £165 per month
- Life and critical illness insurance: £1,168 / £97 per month
- Water: £355 / £30 per month
- Home/contents insurance: £295 / £25 per month
- Professional fees: £243 / £20 per month
- TV licence: £169.50 / £14 per month
- Window cleaning: £122 / £10 per month
- Phone: £96 / £8 per month
- Investment fees: £11 / £0.92 per month
- Internet £300/£25/month
Car Costs
- Fuel: £2,009 / £167 per month
- Car repairs: £415 / £35 per month
- Service/MOT: £388 / £32 per month
- Insurance: £279 / £23 per month
- Parking/tolls: £91 / £8 per month
- Breakdown cover: £73 / £6 per month
- Taxes: £70 / £6 per month
- Driving licence: £14 / £1.17 per month
- Bus/Park & Ride: £38 / £3 per month
- Car wash: £3 / £0.25 per month
- Other: £0.50 / £0.04 per month
Kids
- Clubs/swimming/regular activities: £1,554 / £130 per month
- Clothing: £801 / £67 per month
- Other: £636 / £53 per month
- School trip: £3 / £0.25 per month
Subscriptions
- Music lessons: £905 / £75 per month
- Charity: £124 / £10.33 per month
- Amazon Prime: £107 / £9 per month
- Other streaming service: £50 / £4 per month
- Apps/other: £24.67 / £2 per month
Total Income: £53104
End of year:
Leftover money assuming mortgage of £2430:
DEBT OF -£12766
So - as previously mentioned, I take home around the same salary as you.
The home repair/improvements is low cost in my expenditure this year as we had a lot of maintenance tasks to do last year so not much requiring urgent work this year.
Generally people would pay an average of £5000 per year for the house you're looking at, ie £416 a month. You'd therefore need to spend ~£14500 less than me to break even with the mortgage you're intending to take on if we're being realistic.
This house is unaffordable and you're minimising the fact you have so little left at the end of each month with rent of £930 less each month than your mortgage would cost you. You will sink deeper and deeper into debt each month if you buy this house. Frankly it sounds as if your mortgage company have accepted your unrealistic expenditure information without doing due diligence here.