London New Build Assignment Sales

A practical guide to buying, selling and assessing assignable new-build property contracts in London

London new build assignment sales involve transferring the contractual rights to purchase a new-build property to another buyer before completion. This can provide an exit route for an investor who has exchanged contracts on an off-plan apartment but later decides not to complete the purchase personally.

Assignment sales are an established part of London's off-plan property market. Current London listings include properties specifically marketed as assignment sales, while specialist London agents also advertise expertise in selling off-plan reassignments.

However, an assignment is not simply the same as selling a completed property. The seller is generally transferring a contractual position, so the original purchase agreement, developer's requirements and legal structure need to be examined carefully.

What is a London new-build assignment sale?

An assignment sale normally occurs when an investor has exchanged contracts to purchase a property that is still being built and transfers their contractual interest to another purchaser before completion.

For example, an investor could agree to buy a London apartment for £500,000 during the early stages of construction. Before completion, they may find another buyer willing to take over the contractual purchase for £540,000.

The £40,000 difference is a gross figure rather than automatically representing the seller's net profit. Solicitor fees, developer charges, marketing expenses, tax and other costs can reduce the final amount.

The legal structure also matters. Depending on the circumstances, the transaction could involve an assignment, subsale, novation or another arrangement. A suitably qualified solicitor should review the contract before the opportunity is marketed.

Where London assignment opportunities can arise

Assignment opportunities can appear across London's new-build market, particularly in large regeneration areas and developments where properties were sold off plan well before completion.

Potential locations include:

• Canary Wharf

• Nine Elms

• Battersea

• Greenwich

• Stratford

• Vauxhall

• Wembley

• Old Oak

• Brent

• Colindale

• London Docklands

• East London regeneration areas

• Central and inner London developments

Current London listings demonstrate that assignment sales can appear in established new-build locations. One current N1 listing, for example, is explicitly marketed as an assignment sale with completion estimated for November 2026.

The opportunity, however, depends on the specific contract rather than simply the location.

Check whether the contract allows assignment

This should be the first serious due-diligence step.

Not every London new-build contract can be freely assigned. Some developers prohibit assignments, while others allow them only with written consent or under specific conditions.

Check the original contract for:

• Assignment restrictions

• Developer consent requirements

• Assignment administration fees

• Marketing restrictions

• Assignment deadlines

• Requirements for the incoming purchaser

• Restrictions close to completion

• Continuing liability of the original purchaser

• Any right the developer has to refuse an assignee

The seller should establish these conditions before spending money on marketing.

Assess the original purchase price

The original contract price provides an important starting point, but it does not determine the current assignment value.

Suppose an investor originally contracted to buy an apartment for £450,000 and wants to assign it for £500,000.

The incoming buyer is likely to compare that opportunity with:

• Similar units still available from the developer

• Completed apartments nearby

• Other assignment opportunities

• Current asking prices

• Developer incentives

• Service charges

• Expected rental income

• Completion timing

If the developer is still selling comparable apartments for £480,000 and offering incentives, a £500,000 assignment may be difficult to justify.

London assignment pricing therefore needs to be based on current competition as well as the original purchase price.

Compare the property with current new-build stock

London has a large and varied new-build market. Current development listings include hundreds of schemes across different boroughs and price brackets.

An assignment seller should identify comparable properties based on:

• Location

• Development

• Apartment size

• Number of bedrooms

• Floor level

• Aspect

• Views

• Outdoor space

• Parking

• Amenities

• Service charge

• Completion date

The comparison should ideally include both developer stock and completed resale properties.

This helps establish whether the assignment provides a genuine opportunity rather than simply transferring an expensive contract to another buyer.

Consider London's rental market

Investor buyers may be particularly interested in rental potential.

The rental calculation should use achievable market rent rather than relying entirely on the projections originally supplied when the property was launched.

Consider:

• Monthly rental value

• Service charge

• Letting fees

• Property management

• Insurance

• Maintenance

• Furnishing

• Void periods

• Finance costs

• Tax obligations

London rental conditions can vary significantly between boroughs and property types, so a projected yield for one development should not automatically be applied to another.

The current market also contains developments marketed specifically towards investors, including off-plan opportunities with projected rental returns. Such figures should be independently assessed rather than treated as guaranteed income.

Regeneration can influence buyer demand

Large regeneration schemes can form part of the background assessment when considering a London new-build assignment.

For example, the Old Oak and Park Royal area is being developed around Old Oak Common, with plans for thousands of homes and jobs. The development corporation announced in May 2026 that an agreement had unlocked a 70-acre development site and plans for approximately 8,000 homes and 11,000 jobs.

Battersea is another example of a major regeneration location. The Battersea Power Station development is now moving into its final phase, with further mixed-use development proposed alongside the substantial residential and commercial space already delivered.

Such projects can provide useful context, but future regeneration should not be treated as a guaranteed source of capital growth.

Calculate the genuine assignment margin

A headline assignment profit can be misleading.

For example:

Original contract price: £475,000
Proposed assignment price: £520,000
Gross difference: £45,000

The seller may then have to account for:

• Solicitor fees

• Developer assignment charges

• Agent fees

• Marketing costs

• Finance costs

• Tax consequences

• Professional valuation costs

• Other transaction expenses

The net result could therefore be considerably lower than £45,000.

The incoming buyer should also understand exactly how much is being paid to the original purchaser and what remains payable to the developer.

Understand the deposit already paid

The deposit can be a significant part of an assignment transaction.

If the original purchaser exchanged contracts at £500,000 and paid a 10% deposit, £50,000 may already have been committed under the contract.

The parties should establish:

• How the existing deposit is treated

• What the incoming buyer pays the original purchaser

• What remains payable to the developer

• Whether additional developer fees apply

• When the remaining balance is due

These figures should be documented clearly by the parties' solicitors.

Timing matters in London assignment sales

An investor should consider an assignment well before the contractual completion date.

A longer period before completion provides more time to:

• Obtain developer consent

• Prepare the legal documentation

• Market the property

• Find prospective buyers

• Complete buyer due diligence

• Arrange finance

• Resolve contractual issues

An assignment close to completion can be considerably more time-sensitive.

The seller should establish the exact completion date, assignment deadline, developer requirements and outstanding balance before marketing the opportunity.

Finding buyers for London assignment sales

The target buyer may be a property investor, overseas purchaser, landlord or owner-occupier depending on the development and contractual terms.

A professional assignment listing should clearly explain:

• Development name

• Location

• Apartment number

• Floor

• Size

• Original purchase price

• Assignment price

• Deposit paid

• Remaining balance

• Completion date

• Service charge

• Lease information

• Developer

• Assignment conditions

Specialist London property agencies already market off-plan reassignment opportunities to investor and end-user buyers, demonstrating that there is an established market for this type of transaction.

International buyers can form part of the market

London's new-build sector has historically attracted both UK and international purchasers. This can make overseas buyers a potential audience for certain assignment opportunities, particularly where the development and contract are suitable for that market.

However, an overseas buyer still needs to understand the property's legal structure, financing requirements, taxes, service charges and rental considerations.

The seller should not assume that international interest automatically means a higher assignment price.

What if the assignment does not sell?

An investor should have a fallback plan before entering an assignable contract.

If the developer refuses consent or a suitable buyer cannot be found, the original purchaser may remain responsible for completing the purchase under the original contract.

This is why an assignment strategy should not depend entirely on finding a buyer at a particular price.

The investor should understand their completion obligations and financial exposure before exchanging contracts.

Fraser Bond support for London new-build assignments

Fraser Bond can support investors and property owners assessing London new-build assignment sales through property assessment, investment consultancy, buyer sourcing, marketing, transaction coordination and wider property services.

The focus should be on establishing whether the contract is assignable, whether the property remains competitively priced and whether there is genuine demand from an appropriate incoming buyer.

London's large new-build pipeline provides a wide range of potential opportunities, but it also creates significant competition between developers, completed properties and assignment sellers. Current listings show both conventional new-build stock and properties already being marketed as assignments.

A successful assignment therefore requires careful assessment of the contract, property, pricing, timing and buyer demand.

Any legal or tax implications should be reviewed by a suitably qualified solicitor, conveyancer or tax adviser before proceeding.