100% mortgage

100% mortgage

Compare 100% mortgage

Type
Fixed - Green Mortgage
Initial Term
2 Years
Initial Interest Rate
1.22%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.23%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
“Market Leading 2 Year Fixed Rate”
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.24%
Reverts to 3.54%
Max LTV
60%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.10% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.34%
Reverts to 3.54%
Max LTV
75%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.20% APRC. This is the cost of the mortgage over the full term.

Type
Fixed - Green Mortgage
Initial Term
2 Years
Initial Interest Rate
1.27%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.28%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.54%
Reverts to 3.54%
Max LTV
80%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.20% APRC. This is the cost of the mortgage over the full term.

Type
Fixed - Green Mortgage
Initial Term
2 Years
Initial Interest Rate
1.56%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.58%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.58%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.74%
Reverts to 3.54%
Max LTV
85%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.20% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.44%
Reverts to 3.59%
Max LTV
80%
Product Fee
Yes
Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

There are no tables for this criteria

Type
Fixed - Green Mortgage
Initial Term
5 Years
Initial Interest Rate
1.34%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.35%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 3.50% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.59%
Reverts to 3.54%
Max LTV
75%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.70% APRC. This is the cost of the mortgage over the full term.

Type
Fixed - Green Mortgage
Initial Term
5 Years
Initial Interest Rate
1.47%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.48%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 3.50% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.54%
Reverts to 3.54%
Max LTV
60%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.70% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.89%
Reverts to 3.54%
Max LTV
80%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.80% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.88%
Reverts to 3.59%
Max LTV
80%
Product Fee
Yes
Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 3.60% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
2.19%
Reverts to 3.54%
Max LTV
85%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed - Green Mortgage
Initial Term
5 Years
Initial Interest Rate
2.01%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
2.03%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 3.60% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
2.03%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 3.60% APRC. This is the cost of the mortgage over the full term.

There are no tables for this criteria

Type
Life Tracker
Initial Term
Term of Mortgage
Interest Rate
1.99%
Max LTV
60%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.00% APRC. This is the cost of the mortgage over the full term.

Type
Life Tracker
Initial Term
Term of Mortgage
Interest Rate
1.99%
Max LTV
75%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.00% APRC. This is the cost of the mortgage over the full term.

Type
Life Tracker
Initial Term
Term of Mortgage
Interest Rate
2.44%
Max LTV
80%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.50% APRC. This is the cost of the mortgage over the full term.

Type
Life Tracker
Initial Term
Term of Mortgage
Interest Rate
2.99%
Max LTV
85%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.10% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.54%
Reverts to 3.54%
Max LTV
80%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.20% APRC. This is the cost of the mortgage over the full term.

Type
Fixed First Time Buyer
Initial Term
2 Years
Initial Interest Rate
1.57%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£500 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.58%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.74%
Reverts to 3.54%
Max LTV
85%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.20% APRC. This is the cost of the mortgage over the full term.

Type
Fixed First Time Buyer
Initial Term
2 Years
Initial Interest Rate
1.82%
Reverts to 3.59%
Max LTV
90%
Product Fee
Yes
Call RBS FREE on 0800 096 7447
£500 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.10% APRC. This is the cost of the mortgage over the full term.

Type
Fixed First Time Buyer
Initial Term
2 Years
Initial Interest Rate
1.82%
Reverts to 3.59%
Max LTV
90%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£500 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.10% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.89%
Reverts to 3.54%
Max LTV
80%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.80% APRC. This is the cost of the mortgage over the full term.

Type
Fixed First Time Buyer
Initial Term
5 Years
Initial Interest Rate
2.02%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934
£500 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
2.03%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 3.60% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
2.14%
Reverts to 3.54%
Max LTV
90%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.30% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
2.19%
Reverts to 3.54%
Max LTV
85%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
2.69%
Reverts to 3.54%
Max LTV
90%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.20% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
3.00%
Reverts to 3.59%
Max LTV
95%
Product Fee
No
Call RBS FREE on 0800 096 7447
£250 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.20% APRC. This is the cost of the mortgage over the full term.

Type
Offset Fixed
Initial Term
2 Years
Initial Interest Rate
3.19%
Reverts to 3.54%
Max LTV
60%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.60% APRC. This is the cost of the mortgage over the full term.

Type
Offset Fixed
Initial Term
2 Years
Initial Interest Rate
3.19%
Reverts to 3.54%
Max LTV
75%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.60% APRC. This is the cost of the mortgage over the full term.

Type
Offset Tracker
Initial Term
Base Rate Tracker Offset
Initial Interest Rate
3.29%
Max LTV
60%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.40% APRC. This is the cost of the mortgage over the full term.

Type
Offset Tracker
Initial Term
Base Rate Tracker Offset
Initial Interest Rate
3.29%
Max LTV
75%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.40% APRC. This is the cost of the mortgage over the full term.

Type
Offset Flexible
Initial Term
Life of Mortgage
Initial Interest Rate
4.25%
Variable
Max LTV
80%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934

Early redemption charges may apply. Overall Cost for Comparison 4.40% APRC. This is the cost of the mortgage over the full term.

Type
Offset Flexible
Initial Term
Life of Mortgage
Initial Interest Rate
4.25%
Variable
Max LTV
80%
Product Fee
Yes
Call RBS FREE on 0800 096 7447

Early redemption charges may apply. Overall Cost for Comparison 4.40% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.24%
Reverts to 3.54%
Max LTV
60%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.10% APRC. This is the cost of the mortgage over the full term.

Type
Fixed Remortgage
Initial Term
2 Years
Initial Interest Rate
1.23%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
Call RBS FREE on 0800 096 7447

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed Remortgage
Initial Term
2 Years
Initial Interest Rate
1.23%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
2 Years
Initial Interest Rate
1.34%
Reverts to 3.54%
Max LTV
75%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.20% APRC. This is the cost of the mortgage over the full term.

Type
Fixed Remortgage
Initial Term
2 Years
Initial Interest Rate
1.27%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.54%
Reverts to 3.54%
Max LTV
60%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.70% APRC. This is the cost of the mortgage over the full term.

Type
Fixed Remortgage
Initial Term
5 Years
Initial Interest Rate
1.38%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934

Early redemption charges may apply. Overall Cost for Comparison 3.70% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
1.59%
Reverts to 3.54%
Max LTV
75%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 2.70% APRC. This is the cost of the mortgage over the full term.

Type
Fixed Remortgage
Initial Term
5 Years
Initial Interest Rate
1.48%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
Call NatWest FREE on 0800 158 2934

Early redemption charges may apply. Overall Cost for Comparison 3.80% APRC. This is the cost of the mortgage over the full term.

Type
Fixed Remortgage
Initial Term
5 Years
Initial Interest Rate
1.48%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
Call RBS FREE on 0800 096 7447

Early redemption charges may apply. Overall Cost for Comparison 3.80% APRC. This is the cost of the mortgage over the full term.

Type
Fixed
Initial Term
5 Years
Initial Interest Rate
2.19%
Reverts to 3.54%
Max LTV
85%
Product Fee
Yes
Call First Direct FREE on 0808 296 5500

Early redemption charges may apply. Overall Cost for Comparison 3.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed Remortgage
Initial Term
2 Years
Initial Interest Rate
2.08%
Reverts to 3.59%
Max LTV
90%
Product Fee
Yes
Call RBS FREE on 0800 096 7447

Early redemption charges may apply. Overall Cost for Comparison 4.50% APRC. This is the cost of the mortgage over the full term.

Type
Fixed - Green Mortgage
Initial Term
2 Years
Initial Interest Rate
1.22%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed - Green Mortgage
Initial Term
5 Years
Initial Interest Rate
1.34%
Reverts to 3.59%
Max LTV
60%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed - Green Mortgage
Initial Term
2 Years
Initial Interest Rate
1.27%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed - Green Mortgage
Initial Term
5 Years
Initial Interest Rate
1.47%
Reverts to 3.59%
Max LTV
75%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

Type
Fixed - Green Mortgage
Initial Term
2 Years
Initial Interest Rate
1.56%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call NatWest FREE on 0800 158 2934
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

*
Type
Fixed - Green Mortgage
Initial Term
5 Years
Initial Interest Rate
2.01%
Reverts to 3.59%
Max LTV
85%
Product Fee
Yes
New Green Mortgage Offer – take advantage of reduced rates if you’re buying an energy-efficient home, with an Energy Performance Certificate (EPC rating) of A or B

Available to first-time buyers and existing homeowners, for residential purchases only

Call RBS FREE on 0800 096 7447
£350 CASHBACK

Early redemption charges may apply. Overall Cost for Comparison 4.00% APRC. This is the cost of the mortgage over the full term.

100% Mortgage

Mortgages For First Time Buyers With No Deposit

 

If you are looking for a 100% mortgage, you are likely to find it fairly difficult to find a lender willing to offer such a high loan to value ratio (LTV).  However, there may be a number of other options worth exploring that could help you find a suitable mortgage deal.  You may like to consider the following:

  • A limited number of  lenders may offer up to 100% LTV mortgages based on your situation.
  • If you have a relative who would be willing to act as a guarantor on your mortgage, some lenders may offer you a mortgage.
  • By sharing your mortgage with a partner, relative or friend, you could also share associated costs.