Selling Your House Privately to Family

At Towerstone, we provide specialist property accountancy services for homeowners, landlords, and property investors. We have written this article to explain how private sales work and what to document, helping you make informed decisions.

Selling a house privately to a family member is perfectly legal in England and Wales, and it is more common than many people realise. Parents sell to children, siblings sell to each other, and extended family arrangements are made for many sensible reasons, such as helping someone onto the property ladder, keeping a home in the family, or simplifying long term plans.

However, while the idea sounds straightforward, the process and consequences are not the same as an ordinary open market sale. Tax rules, mortgage requirements, valuation issues, and benefit considerations can all apply in ways that surprise people if they are not prepared.

In this guide, I will walk you through how to sell a house privately to a family member, step by step, in clear UK terms. I will explain how to do it properly, what professionals you still need, and the key traps to avoid so that the transaction achieves what you intend without creating unexpected problems later.

Is it legal to sell a house privately to a family member?

Yes, it is completely legal to sell your house privately to a family member.

You are free to:

Choose your buyer

Agree any price you like

Sell without using an estate agent

There is no legal requirement to market the property publicly, and no obligation to sell at market value.

That said, HMRC and mortgage lenders do not always accept the agreed price at face value, especially where family members are involved. This is where careful planning matters.

Why people sell privately to family

People choose private family sales for many good reasons.

Common motivations include helping children or grandchildren buy a first home, avoiding estate agent fees, keeping a property within the family, resolving inheritance planning early, supporting relatives during financial difficulty, or simplifying arrangements after bereavement or divorce.

The reason for the sale does not affect whether it is allowed, but it often affects how the sale is treated for tax and benefits.

Step one, decide how the property will be sold

Before involving solicitors or lenders, you need clarity on the structure of the sale.

Key questions to answer early include:

Who is buying the property

Whether the buyer is using a mortgage

The agreed sale price

Whether the price is at market value or discounted

Whether the discount is intended as a gift

These decisions influence everything that follows.

Selling at market value vs below market value

This distinction is critical.

Selling at full market value

If you sell at full market value:

The transaction closely resembles a normal sale

Tax treatment is usually simpler

Mortgage lenders are more comfortable

HMRC is less likely to challenge valuations

This is often the cleanest option, even within families.

Selling below market value

If you sell at a discount, the difference between market value and sale price is usually treated as a gift.

This can be helpful for family support, but it has tax and benefit implications that must be understood properly.

Step two, get a proper valuation

Even if you already know the agreed price, obtaining a professional valuation is strongly recommended.

A valuation helps:

Demonstrate market value to HMRC

Support Capital Gains Tax calculations

Satisfy mortgage lenders

Protect against future disputes within the family

This can be done by a RICS surveyor or through formal estate agent valuations.

For tax purposes, HMRC can substitute market value where buyers and sellers are connected, so evidence matters.

Step three, understand Capital Gains Tax implications

Capital Gains Tax is one of the biggest issues people overlook.

If the property is your main home

If the property has been your only or main residence throughout ownership, Private Residence Relief usually applies.

In that case:

No Capital Gains Tax is due

Selling below market value does not normally change this

This is the simplest scenario.

If the property is not your main home

If the property is:

A rental property

A former home that was let

An inherited property you never lived in

Capital Gains Tax may apply.

If you sell to a family member, HMRC usually treats the sale as happening at full market value, even if you sold for less.

This means:

CGT may be calculated on a gain you did not receive in cash

The discount does not reduce the tax bill

This catches many sellers out, particularly parents helping children.

Step four, consider inheritance tax implications

Selling a property below market value often creates a gift element.

For inheritance tax purposes:

The discount is treated as a gift

It may be a potentially exempt transfer

If you die within seven years, it may be taxed

If you sell cheaply and continue to benefit from the property, for example by living there rent free, the transaction may be treated as a gift with reservation of benefit, which can negate inheritance tax planning entirely.

This area requires careful thought if estate planning is part of your motivation.

Step five, mortgage considerations for the buyer

If the family member is using a mortgage, lender rules become very important.

Concessionary purchases and gifted equity

Many lenders treat family sales below market value as concessionary purchases.

In these cases:

The discount may be treated as gifted equity

The gift can sometimes count as the buyer’s deposit

The lender must be informed fully

Lenders will usually require:

A formal valuation

A gift letter confirming the discount does not need to be repaid

Confirmation of the relationship between buyer and seller

Not all lenders accept concessionary purchases, so mortgage advice is essential.

If the buyer is buying with cash

Cash purchases are simpler.

There are:

No lender restrictions

Fewer documents required

Greater flexibility on price

However, tax rules still apply in the same way for the seller.

Step six, instruct solicitors on both sides

Even though the sale is private, you still need solicitors.

You should:

Each instruct a separate solicitor

Avoid using the same solicitor for both sides

Ensure independent advice for buyer and seller

This protects everyone involved and reduces the risk of disputes later.

The solicitor will handle:

Contracts

Title checks

Transfer of ownership

Stamp Duty submissions

Land Registry registration

Private sales still follow the same legal conveyancing process.

Step seven, Stamp Duty Land Tax for the buyer

Stamp Duty Land Tax is usually calculated on the price actually paid, not market value.

This means:

A discounted price can reduce SDLT

First time buyer relief may apply if conditions are met

However, there are exceptions, particularly if the buyer takes on an existing mortgage or complex arrangements exist.

Your solicitor will calculate SDLT correctly and submit the return.

Step eight, complete the sale properly

Once contracts are agreed and exchanged, completion happens in the usual way.

Funds are transferred, ownership changes, and the buyer becomes the legal owner.

Even though the sale is between family members, everything should be documented and completed formally. Informal arrangements cause problems later.

Avoiding common mistakes

Private family sales go wrong most often because people assume they can be informal.

Common mistakes include:

Not getting a valuation

Ignoring Capital Gains Tax

Assuming gifts are tax free

Using one solicitor for both sides

Not telling the mortgage lender about the relationship

Continuing to live in the property without proper arrangements

These mistakes can be very expensive.

Living in the property after selling it

If you sell to a family member and continue to live in the property, this creates additional complications.

Potential issues include:

Gift with reservation of benefit rules

Benefit entitlement problems

Informal arrangements causing family disputes

If you intend to stay in the property, this must be planned carefully, often with a market rent paid.

Benefits and care funding considerations

If you sell below market value and later claim means tested benefits or care support, the authorities may treat the discount as deprivation of capital.

This can result in:

Benefit claims being refused

Care funding being denied

This is particularly important for older sellers.

When selling privately makes sense

Private family sales often work well when:

The property is the seller’s main home

The seller understands the tax position

The buyer has mortgage advice

The price structure is clear

Professional advice is taken early

They are less suitable where the seller needs cash, relies on benefits, or expects to continue using the property.

A simple way to think about it

A helpful rule of thumb is this:

You can agree any price you like within the family, but tax and lenders may ignore that price and look at market value instead.

If you plan with that in mind, you avoid most problems.

Practical checklist before you proceed

Before selling privately to a family member, make sure you have:

A clear reason for the sale

A professional valuation

An understanding of CGT and inheritance tax

Mortgage advice for the buyer

Separate solicitors instructed

Written documentation for any gift element

Working through this list prevents most issues.

Final thoughts

Selling a house privately to a family member can be a generous, practical, and positive decision, but it is not something to do casually. The law allows it, but the tax system and mortgage lenders apply additional rules that do not exist in ordinary sales.

The biggest risk is assuming that because no money changes hands, or because it is “all within the family”, there are no consequences. In reality, family transactions are often scrutinised more closely, not less.

With proper planning, clear documentation, and professional advice at the right time, selling privately to a family member can achieve exactly what you want, without unpleasant surprises later.

If you would like to explore related property guidance, you may find how much does it cost to sell a house and how much is bedroom tax useful. For broader property guidance, visit our property hub.