The value of British Sign Language

What is the issue?

Over 430 million people worldwide, including 34 million children, live with disabling hearing loss. Deaf and hard-of-hearing individuals face persistent barriers to education, employment, and social participation, reinforcing social and economic disadvantage.

In the UK, around 1 to 2 in every 1,000 children are born deaf, most to hearing parents with limited experience of deafness. Early screening ensures identification within weeks of birth, and families are offered hearing technologies, speech therapy, and, in some cases, sign language support. Consistent language exposure in early childhood is critical for cognitive and social development.

While hearing aids and cochlear implants can provide access to spoken language, their success depends on reliable use, family engagement, and ongoing support. Without this, children risk language deprivation, which can have lasting educational, emotional, and social consequences. British Sign Language (BSL), legally recognised in 2022, offers an important route to language acquisition, particularly when spoken language access is incomplete. However, only around 9% of severely to profoundly deaf children use BSL in school, and many parents remain unaware of its benefits.

Early access to BSL can strengthen communication, learning, and wellbeing outcomes, supporting equal opportunities for deaf children. Yet, there is little evidence on the economic value of sign language, and no UK-specific analysis quantifying the long-term costs and benefits of early-years access to BSL. Addressing this gap is key to informing policy and investment in early language development.

How did we help?

The British Deaf Association (BDA) commissioned RAND Europe to assess the potential costs and benefits of early access to British Sign Language for deaf children. The study focused on early childhood (birth to age five), a crucial period for language development, to evaluate whether early BSL exposure is associated with improved outcomes in health, education and employment.

The research combined a targeted literature review and economic modelling:

• The literature review analysed how sign language contributes to early development, education, employment and health.
• Insights from this review informed an economic model simulating a cohort of deaf children over their lifetime, estimating the net economic value of early BSL access.

The model quantified benefits such as improved quality of life, better employment outcomes, and reduced healthcare costs linked to conditions associated with early language deprivation. These benefits were compared with the costs of early BSL instruction and related family support.

Two main scenarios were examined:

1. BSL as a standalone intervention, compared with no BSL or hearing technologies.
2. BSL as a complementary intervention, delivered alongside hearing technologies for children at risk of limited language access.

Results were presented over 50- and 80-year horizons, with Benefit-Cost Ratios (BCRs) calculated to show the return per £1 invested. Findings were modelled under three sets of assumptions: base case, pessimistic, and optimistic.

What did we find?

Overall, providing deaf children with early access to BSL represents a valuable investment in human capital, with potential to generate meaningful economic and social returns. While results vary across scenarios, early BSL exposure improves lifelong outcomes in education, employment, health and wellbeing.

Specifically, the analysis found that:

• Early-years BSL acquisition can have positive economic returns as a standalone intervention. In the base case, the BCR was 2.34 over an 80-year horizon and 2.04 over 50 years, meaning every £1 invested could generate more than £2 in benefits. Even under pessimistic assumptions, around half of the investment could be recouped (£0.44 over 50 years, £0.51 over 80 years). Under optimistic assumptions, returns rise to £14.8 over 50 years and £16.5 over 80 years per £1 invested.
• Early-years BSL acquisition can have positive potential returns even when provided alongside hearing technologies. When used alongside hearing technologies to mitigate the risk of early language deprivation for deaf children for which technology may not be fully beneficial, the economic returns depend on the proportion of children at risk of incomplete language acquisition. When 15-20% of children are assumed at risk, benefits begin to outweigh costs (BCR ≥1), with higher returns as this group grows.
• Universal, early BSL provision to children born deaf could eventually support the prevention of early language deprivation for children who do not fully benefit from access to hearing technologies.

These results support greater inclusion of early BSL access in early intervention pathways. Investing in sign language during the early years can yield lasting benefits for children, families and society.

What can be done?

To maximise the benefits of early BSL access and strengthen the evidence base for policy and practice, the following actions are recommended:

Ensure early access to BSL for deaf children

• Provide all families, especially hearing parents, with clear and balanced information on both signed and spoken language options.
• Embed early BSL exposure from infancy within standard early intervention programmes alongside hearing technologies and speech therapy.

Invest in research on BSL outcomes

• Establish dedicated research funding to address evidence gaps on the long-term impacts of early BSL exposure across health, education, and employment.

Integrate BSL into data collection and monitoring

• Expand BSL representation in national surveys and administrative datasets.